Commissioning Soc Trang Town Wastewater Treatment Plant Wastewater Disposal in Provincial Towns,...

Commissioning

Soc Trang Town Wastewater Treatment Plant Wastewater Disposal in Provincial Towns, Programme South Soc Trang, contract 2/2

WaRoTec Water and Pipeline Technology GmbH

Modified Operation Manual

20.06.2013

WASTEWATER TREATMENT PLANT

SOC TRANG TOWN - OPERATION MANUAL

Tender 2 - Lot 2

WaRoTec GmbH Water and Pipeline Technology

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Table of content

1 Inlet chamber - “A”.................................................................................................... 2

2. Coarse Screen - “B” .................................................................................................... 3

3. Fine Screen - “D”......................................................................................................... 9

4. Grit Chamber - “E” .................................................................................................. 15

5. Venturi flume.............................................................................................................. 27

6. Primary sedimentation tank – “G”........................................................................... 28

7. Primary sludge pumping station – “K”.................................................................... 37

8. Open digestion ponds - “Q1” – “Q3” ...................................................................... 43

9. Sludge Drying Beds – “R1”-“R12” ........................................................................... 46

10. Sludge Water Pumping Station – “X”...................................................................... 48

11. Outlet (effluent) chamber – “Y” ............................................................................... 53

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1 Inlet chamber - “A”

1.1 General

The inlet structure of WWTP is divided by the concrete overflow weir into

the receiving and the conveying chambers.

The inlet chamber is the receiving structure of WWTP, the incoming waste

water from the pumping stations arrives here and is being conveyed via

concrete overflow weir to the main channel to the screening plant, which is

located downstream in direct vicinity to the inlet structure.

The inlet structure contains of an emergency overflow chamber, which is

connected via reinforced concrete pipe DN800 to the collecting manhole

downstream of primary sedimentation tanks. The main goal of the

emergency overflow chamber is to protect the WWTP structures located

further downstream against flooding.

1.2 Water levels

• 4,11 m Overflow weir receiving chamber

• 4,30 m max. W.L. receiving chamber

• 4,00 m Emergency overflow conveying chamber

• 3,83 m max. W.L. main conveying channel

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1.3 Control and Instrumentation Items

QA100S Stationary automatic sampler station No. 1

1.4 The Control System

1. Stationary automatic sampler – QA100S

• Automatic waste water sample collection for laboratory analysis

2. Penstock PEN-A-001 in the main conveying channel

• Manually operated, OPEN/CLOSE

• To shut off the discharge of influent waste water to the plant

2. Coarse Screen - “B”

2.1 General

Within the package unit XB100 coarse materials >=60mm are

automatically screened out of the raw wastewater. The screening is

transported by a belt conveyor into containers for disposal.

System XB100 includes two parallel channels. Each channel is equipped

with a coarse screen and manually activated inlet channel gates. In normal operation both screens are in operation. In case of emergency or

clogging of the coarse screens, water will be conveyed through the by-pass

channel equipped with a manually cleaned bar screen.

Each channel is equipped with manually operated inlet channel gate. A belt

conveyor conveys the screening into container for disposal.

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2.2 Water levels

1. Water levels upstream of coarse screens

• 3,74 m min W.L. at Qmin

• 3,82 m W.L. at Qdry

• 3,83 m max W.L. at Qmax

2. Water levels downstream coarse screens




2.3 Motors

MB 101 Coarse Screen No. 1

MB 102 Coarse Screen No. 2

MB 103 Belt Conveyor


LB 101U Differential level ultrasonic sensor coarse screen No. 1

LB 102U Differential level ultrasonic sensor coarse screen No. 2

PEN-XB-001 – Penstock at the inlet to the by-pass channel

PEN-XB-002 – Penstock at the inlet to the screening channel 1

PEN-XB-003 – Penstock at the inlet to the screening channel 2


• To shut off the discharge of influent waste water to the screening

plant

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• To open the inlet of by-pass channel with the manually raked bar

screen in case of screening plant malfunction or maintenance


1. Low Voltage Motor Control Centre : LV-MCC1

Package unit XB100 has its own control system which is

installed at LV-MCC1 consisting of following features for

each motor:

• Key selector switch “Manual” – “0” – “Auto”

• Pushbuttons “ON” and “OFF”

• Indicator lamps “RUN- GREEN”, “FAULT- RED”

• Ampere-meter

• Operation hours counter

2. Local Control Panels

The LV-MCC 1 is installed in the direct vicinity to the equipment to be

operated, therefore there is no need of any additional local control panels.

3. Emergency Pushbutton System

In case of emergency the complete screening plant could be immediately

stopped, by pressing of one of emergency switches:

• Main emergency pushbutton, located at LV-MCC1

• Emergency mushroom pushbutton XB100-ES1,located on the left

side of the coarse screen MB101 (looking at the coarse screens from

the front side)

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• Emergency mushroom pushbutton XB100-ES2, located on the right

side of the coarse screen MB102 (looking at the coarse screens from

the front side)

4. Alarm Acknowledgment System

In case of any emergency switch was pressed or any alarm (e.g. circuit

breaker trip, power cut off) occurs an alarm acknowledge is necessary. As

soon all the emergency switches are released, the cause of the alarm has

been found and fault has been eliminated, the operator has to press the

alarm acknowledgement button to confirm that the system is ready for

further operation. If the screens were in an intermediate position, the system

will bring the units to their respective home positions.

5. Differential Level Measurement System

Both coarse screens are equipped with their own differential level

measurement system, which features are:

• Measurement of waste water elevation up- and downstream of the

screens

• Adjustable control and monitoring functions

• Automatic control of the coarse screen (pre-set differential level

set-point)

• Recommended set-point – 15 cm

6. Operation in Automatic Mode

• Start by differential level

a) Screen is at the rest position

b) The differential level measurement system is in operation

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c) Differential level rises above set-point

d) Initiate screen operation

e) Differential level drops below set-point

f) Screen moves until the home position is reached and stops

• Start by time control or one cycle pushbutton


b) Differential level is below set-point for an adjustable period

of time (30-180 min) or one cycle pushbutton pressed

c) Time control / one cycle pushbutton override the differential

level measurement system


e) One complete cleaning cycle is performed

f) Screen stops at home position

• Operation of the conveyor belt

a) Conveyor belt starts always when the screens are in operation

b) After screens stopped, conveyor belt will be switched off after

an adjustable time delay of 1 to 5 min.

7. Operation in Manual Mode

• The whole package unit could be operated manually from the

control cabinet LV-MCC1

• Turn the key selector switch to “Manual”

• Use the pushbutton “ON” to start the appropriate equipment

• Use the pushbutton “OFF” to stop the operation of the unit

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• This mode is only foreseen during maintenance works

8. Operation from MIMIC

• Remote control of the screens and of the conveyor belt

• Selector switch “Central Control OFF-Central Control ON”

• “ON” and “OFF” pushbuttons for each unit

• Central Control operation overrides AUTO mode

• Pre-condition: units are in AUTO mode

9. Interface to MIMIC – Package unit

• 3 x “Run” signal

• 3 x “Fault” signal

• 3 x “Auto” signal

• 1 x “Emergency stop” signal

• 1 x Incoming signal “Central Control OFF- Central Control

ON”

• 3 x Incoming “Start” command

• 3 x Incoming “Stop” command

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3. Fine Screen - “D”

3.1 General

Within the package unit XD100 the fine materials >=6 mm are

automatically screened out of the raw wastewater. The screening is

transported by a belt conveyor into container for disposal.

System XD100 includes two fine screens which are situated directly after

the coarse screens. Under normal conditions both screens are in operation.

In case of emergency or malfunction of the fine screens, water will be

conveyed through the by-pass channel equipped with a manually cleaned

bar screen. Each channel is equipped with manually activated outlet channel

gate.

A belt conveyor conveys the screening into container for disposal.

3.2 Water levels

1. Water levels upstream of fine screens




2. Water levels downstream of fine screens




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3.3 Motors

MD 101 - Fine Screen No. 1 MD102 - Fine Screen No. 2

MD103 - Belt Conveyor


LD 101U Differential level ultrasonic sensor fine screen No. 1 LD 102U Differential level ultrasonic sensor fine screen No. 2

PEN-XD-001 – Penstock at the outlet to the by-pass channel

PEN-XD-002 – Penstock at the outlet to the screening channel 1

PEN-XD-003 – Penstock at the outlet to the screening channel 2


• To shut off the discharge of screened waste water to the grit removal

plant

• To open the outlet of by-pass channel with the manually raked bar

screen in case of screening plant malfunction or maintenance

3.5 The Control System – Fine Screens


Package unit XD100 has its own control system which is

installed at LV-MCC1 consisting of following features for

each motor:


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• Ampere-meter



The LV-MCC 1 is installed in the direct vicinity to the equipment to be

operated, therefore there is no need of any additional local control panels.


In case of emergency the complete screening plant could be immediately

stopped, by pressing of one of emergency switches:

• Main emergency pushbutton, located at LV-MCC1

• Emergency mushroom pushbutton XD100-ES1,located on the left

side of the fine screen MD101 (looking at the coarse screens from

the front side)

• Emergency mushroom pushbutton XD100-ES2, located on the right

side of the fine screen MD102 (looking at the coarse screens from

the front side)







further operation.

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5. Differential Level Measurement System

Both coarse screens are equipped with their own differential level

measurement system, which features are:

• Measurement of waste water elevation up- and downstream of the

screens


• Automatic control of the fine screen (pre-set differential level set-

point)

• Recommended set-point – 15 cm


• Start by differential level


b) The differential level measurement system is in operation

c) Differential level rises above set-point


e) Differential level drops below set-point

f) Screen continues its operation and after an adjustable time

delay of 1 to 5 min. stops

• Start by time control


b) Differential level is below set-point for an adjustable period

of time (30-180 min)

c) Time control overrides the different level measurement

system

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e) Operation of the screen continues for an adjustable period of

time of 1 to 5 min.

f) Screen stops

* Operation of the conveyor belt

g) Conveyor belt starts always when the screens are in operation

h) After screens stopped, conveyor belt will be switched off after an .

…….adjustable time delay of 1 to 5 min

.


• The whole package unit could be operated manually from the

control cabinet LV-MCC1






• Remote control of the screens and of the conveyor belt




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• 1x Incoming signal “Central Control OFF,Central Control ON”



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4. Grit Chamber - “E”

4.1 General

The main goal of the package unit XE 100 is the removal of settled sand

within the grit chamber.

The grit chamber E is divided into two parallel tanks. The tanks are

equipped with manually operated penstocks at the inlet and with fixed

overflow weir at the outlet.

The grit chamber is equipped with a coarse bubble aeration system.

There is a travelling twin scraper bridge for grit removal, which is equipped

with two grit suction pumps (ME103 and ME104), one for each tank.

The grit is pumped from the bottom of the grit tanks by pumps ME103 and

ME104 into two separate sand traps located at the edge of each grit

chamber. The sand traps have drainage holes to discharge the drain water

back to the grit tanks. At the outlet side of each sand trap a weir with

channel gate is installed. The grit collected in the sand traps will be

removed manually into container for further disposal.

4.2 Water levels

1. Water levels in the grit removal tanks




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2. Water levels in the outlet chamber of grit removal tanks




4.3 Motors

ME101 Twin bridge drive ME102 Cable drum for bridge ME103 Submersible grit pump 1 ME104 Submersible grit pump 2


GE101 Limit switch for bridge position - start

GE102 Limit switch for bridge position – end of tank GE103 Wheel movement monitoring on one non driven bridge wheel

PEN-XE-001 – Penstock at the inlet to the grit chamber 1

PEN-XE-002 – Penstock at the inlet to the grit chamber 2


• To shut off the discharge of screened waste water to the grit removal

chambers

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4.5 The Control System – Scraper bridge XE100

The package unit XE 100 will be installed as a complete system. The unit

will have its own process control system within the local switch board

installed directly on the bridge. In case of failure of the single units within

the package unit the bridge will be stopped and a “Fault” signal is

transferred to the control room.

1. Main control switchboard

• Main power switch combining emergency and repair switch

function with padlock at the panels front site

• Voltmeter for the incoming power supply

• Key-switch for “Manual”- “O”- “Automatic” mode

• Selector switch for the operation mode of the grit pumps

“Pump 1”-“Pump 2” – “Both pumps”

• “Start” push button (green illuminated) for automatic operation

mode

• “Alarm acknowledge” pushbutton

• “Lamp test” pushbutton

• Amperemeter for each pump

• Operation hours counter for each motor

• Wheel monitoring fault lamp

• “Start” and “End” position indication lamps

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• Control elements for each motor, see table below

Motor control elements of the scraper bridge XE100

Local panel of scraper bridge XE100 Push buttons (for manual mode only)

Drive Lamps (green=active, red=alarm)

ME 101 Green Red Start forward Start backward

Stop ME 101 Green Red ME 103 grit pump Green Red Start Stop ME 104 grit pump Green Red


The control switchboard is installed directly on the twin bridge, therefore

there is no need of any additional local control panels.


In case of emergency the twin bridge could be immediately stopped, by

pressing the one of emergency switches:

• Main emergency / repair switch, located directly at the control board

• Emergency mushroom pushbutton XE100-ES1,located at the

entrance to the bridge







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further operation. If the bridge is in an intermediate position, the operator

has to bring the unit to its respective start position.

5. Proximity switches / Wheel monitoring

The twin bridge is equipped with two proximity limit switches and non-

driven wheel monitoring system. These sensors are used for:

• Recognition of the start and end position of the bridge

• Monitoring of the bridge movement and alarm function. In case that

the bridge is in operation (Automatic Or Manual) and no movement

is indicated, all the motors will be immediately stopped and alarm

signal is displayed


• Initial start from home position

a) Bridge at the home position (GE101), indication by the

appropriate “Start position” lamp

b) Key selector switch on “Automatic”

c) The grit pumps ME103 and ME104 are pre-selected,

according to the ongoing operation conditions

d) No alarms are indicated

e) Initiate the start of the bridge by pressing the illuminated

pushbutton “Start”

f) The “Start” pushbutton will light on to indicate that the

command has been accepted

g) Twin bridge motor ME101 will start operation for the

forward movement

h) Cable drum motor ME102 will start operation together with

ME101 to keep the cable under certain tension

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i) Grit pumps ME103 and ME104 will start operation according

to the pre-selection

j) Twin bridge will continue moving until the stop position is

reached (GE102), indicated by the appropriate “End position”

lamp

• End position

a) “End position” is reached (GE102), indicated through

appropriate lamp

b) Twin bridge motor ME101 and cable drum motor ME102 will

be switched off

c) Grit pumps ME103 and ME104 will be switched off

d) An adjustable on-delay timer (1 – 6 h) for the back to “Start

position” starts

• Back to start movement

a) As soon the delay time is elapsed or the “Start” illuminated

pushbutton is pressed by the operator the back to “Start

position” movement is initiated

b) Twin bridge motor ME101 will start operation for the

backward movement

c) Cable drum motor ME102 will start operation together with

ME101 to keep the cable under certain tension

d) Grit pumps ME103 and ME104 will start operation according

to the pre-selection

e) Twin bridge will continue moving until the stop position is

reached (GE101), indicated by the appropriate “Start

position” lamp

f) All motors will be stopped and the on-delay timer (1 – 6 h)

will be started again for the next automatic start

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• The package unit could be operated manually from the control

cabinet located directly on the bridge



• Press “Start forward” or “Start backward” pushbutton to move

the bridge in the direction needed

• Use the appropriate “OFF” pushbuttons to stop the operation

of the units



• Remote control of the twin bridge


• “ON” pushbutton has the same function as the “Start”

illuminated pushbutton at the local switchboard on the bridge

• “OFF” pushbutton stops all the motors of the bridge at the same

time



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9. Interface to MIMIC – Whole package unit

• “Run” signal

• “Fault” signal – collective fault

• “Auto” signal

• “Emergency stop” signal

• Incoming signal “Central Control OFF- Central Control ON”

• Incoming “Start” command

• Incoming “Stop” command

4.6 Coarse Air Buble Aeration System – Air Blower Station

DRW. No. D 10 R 404 sheet 1 to 3 of 3

The coarse air bubble aeration system consist of :

• air blower station – two air blower

( one in operation and one stand-by )

• main air supply pipe – DN 80

• air distribution pipes DN 25 into each grit removal tank

• each air distribution pipe is equipped with one manual operated ball

valve DN 25

1. Motors and Local Control Panels.

ME 201 Air Blower No. 1 with LCP ME 201Q

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ME 202 Air Blower No. 2 with LCP ME 202 Q

2. Control and Instrumentation Items

ME 201 Air Blower No. 1

• ME 201 T Motor Temperature Protection

• ME 201 H Anti-condensation Heater

ME 202 Air Blower No. 2

• ME 202 T Motor Temperature Protection

• ME 202 H Anti-condensation Heater

3. The Control System

3.1 Low Voltage Motor Control Centre : LV-MCC2

The control system of the air blower station station

‘ is installed at LV-MCC2 and contains of following

……….features for each motor:




• Ampere meter


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3.2 Local Control Panels

The local control panels are installed in the direct vicinity to the

……….equipment to be operated and include following control and

……….indication elements:


• Illuminated “ON-GREEN” pushbutton

• “OFF” pushbutton

• Indicator lamp “FAULT- RED”

3.3 Emergency Pushbutton System

In case of emergency the sludge the air blower station could be

……….immediately stopped, by pressing of the emergency switch

………foreseen:

• Main emergency mushroom switch, located directly at air blower

station

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3.3 Alarm Acknowledgment System


…..breaker trip, power cut off) occurs an alarm acknowledge is necessary.

…. As soon all the emergency switches are released, the cause of the alarm

…. has been found and fault has been eliminated, the operator has to press

…. the alarm acknowledgement button to confirm that the system is ready

…. for further operation.

3.4 Operation in Automatic Mode

a) One air blower in operation and one stand-by

b) Air blowers are operated within pre-set running hours to assure

equal operation hours for each pump.

c) In case of no permanent inlet flow, operator has possibility to setting

value trigger “Quiet Level” and air blower will be run depending from inlet

flow.

d) If air blower fails to operate, it will be automatically locked out and

. alarm signal will be given

e) Stand-by air blower automatically takes the place of the failed one

f) The operation of the air blower is protected by the motor temperature

. protection

3.5 Operation in Manual Mode

• The air blowers could be operated manually from the motor

control centre LV-MCC2 or from the local control panels



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3.6 Operation from MIMIC

• Remote control of the air blowers





3.7 Interface to MIMIC






ON”



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5. Venturi flume

5.1 General

The Khafagi-Venturi flume is installed in the outlet collection channel of

grit removal chamber. Together with the ultrasonic sensor and transmitter

units this flume forms the incoming waste water flow measurement system.

The waste water elevation in the flume is measured by the ultrasonic sensor

and then the measured level is being recalculated into the actual flow, using

the pre-programmed linearization tables.

5.2 Water levels

1. Water level in outlet channel of grit chamber




2. Water level downstream of the Venturi flume





FE100U Ultrasonic measurement system

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The measured flow value and the totalized volume of incoming waste water

during the day are registered and indicated at Central Control Room.

6. Primary sedimentation tank – “G”

6.1 General

The main goal of the package unit XG 100 is to reduce the amount of

organic matter in the waste water by means of sedimentation.

The primary sedimentation tank G is divided into two parallel rectangular

chambers G1 + G2. At the inlet of each chamber a manually operated

penstock is installed. The distribution of the incoming waste water will be

done by series of Stengel pipes DN250, equipped with deflectors. At the

outlet the overflow weirs are provided, and the effluent waste water is

collected by one collection outlet channel.

There is one travelling twin-scraper bridge for removal of primary sludge

from the bottom of the chambers as well as for removal of floating

scum/grease from the surface, which is equipped with two bottom scraper s

and two surface scum shields, a pair for each chamber.

At the inlet chamber of the primary sedimentation tank the pH and

temperature measurement system QG101Z is installed.

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6.2 Water levels

1. Water level in inlet chamber of primary sedimentation tank




2. Water level in primary sedimentation tanks




3. Water level over the PST effluent weirs




4. Water level in the PST effluent trough




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6.3 Motors

MG101 twin bridge drive MG102 cable drum for bridge MG201 Gear motor lower sludge scraper, chamber 1 MG202 Gear motor upper scum scraper, chamber 1

MG203 Gear motor lower sludge scraper, chamber 2 MG204 Gear motor upper scum scraper, chamber 2


GG101 Limit switch for bridge position - start

GG102 Limit switch for bridge position – end of tank GG103 Wheel movement monitoring of one non driven bridge wheel

GG201 Limit switch lower sludge scraper UP, chamber 1

GG202 Limit switch lower sludge scraper DOWN, chamber 1

GG203 Limit switch upper scum scraper UP, chamber 1

GG204 Limit switch upper scum scraper DOWN, chamber 1

GG205 Limit switch lower sludge scraper UP, chamber 2

GG206 Limit switch lower sludge scraper DOWN, chamber 2

GG207 Limit switch upper scum scraper UP, chamber 2

GG208 Limit switch upper scum scraper DOWN, chamber 2

QG101Z Combined PH and temperature measurement

PEN-XG-001 – Penstock at the inlet to the PST chamber 1

PEN-XG-002 – Penstock at the inlet to the PST chamber 2

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• To shut off the discharge of waste water from grit removal to the

• primary sedimentation tank chambers

6.5 The Control System – Scraper bridge XG100

The package unit XG 100 will be installed as a complete system. The unit

will have its own process control system within the local switch board

installed directly on the bridge. In case of failure of a single units within the

package unit a “Fault” signal is transferred to the control room.

The switchboard of the package unit will consist of the following

configuration:

1. Main control switchboard

• Main power switch combining emergency and repair switch

function with padlock at the panels front site

• Voltmeter for the incoming power supply

• Key-switch for “Manual”- “O”- “Automatic” mode

• 2 selector switches for the operation mode of the sludge

scrapers and scum shields “OFF”-“Only sludge scraper”-

“Sludge scraper + Scum shields”

• “Start” push button (green illuminated) for automatic operation

mode

• “Alarm acknowledge” pushbutton

• “Lamp test” pushbutton

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• Operation hours counter for each motor

• Wheel monitoring fault lamp

• “Start” and “End” position indication lamps

• Control elements for each motor, see table below

•

Motor control elements of scraper bridge XG100

Local panel of scraper bridge XG100 Push buttons (for manual mode only)

Drive Lamps (green=active, red=alarm)

MG 101 Green Red Start forward Start backward

Stop MG 101 Green Red

Up 1) Down

1) MG 201 sludge scraper drive Green Red Up

1) Down 1) MG 202 scum shield drive Green Red

Up 1) Down

1) MG 203 sludge scraper drive Green Red Up

1) Down 1) MG 204 scum shield drive Green Red

(1) Push button has to be pressed continuously.


The control switchboard is installed directly on the twin bridge, therefore

there is no need of any additional local control panels.


In case of emergency the twin bridge could be immediately stopped, by

pressing the one of emergency switches:

• Main emergency / repair switch, located directly at the control board

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• Emergency mushroom pushbutton XG100-ES1, located at the

entrance to the bridge







further operation. If the bridge is in an intermediate position, the operator

has to bring the unit to its respective start position.

5. Proximity switches / Wheel monitoring

The twin bridge is equipped with several proximity limit switches and non-

driven wheel monitoring system. These sensors are used for:

• Recognition of the start and end position of the bridge

• Determining of the current sludge scraper and scum shield

positions, e.g. lifted up or lowered down

• Monitoring of the bridge movement and alarm function. In case that

the bridge is in operation (Automatic Or Manual) and no movement

is indicated, all the motors will be immediately stopped and alarm

signal is displayed


• Initial start from home position

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a) Bridge at the home position (GG101), indication by the

appropriate “Start position” lamp

b) Key selector switch on “Automatic”

c) The sludge scrapers and scum shields are pre-selected,

according to the ongoing operation conditions and lifted up,

which is determined by limit switches (GG201, GG203,

GG205, GG207)

d) No alarms are indicated

e) Initiate the start of the bridge by pressing the illuminated

pushbutton “Start”

f) The “Start” pushbutton will light on to indicate that the

command has been accepted

g) Twin bridge motor MG101 will start operation for the

forward movement

h) Cable drum motor MG102 will start operation together with

MG101 to keep the cable under certain tension

i) Sludge scrapers and scum shields will be kept in the upper

position

j) Twin bridge will continue moving until the stop position is

reached (GG102), indicated by the appropriate “End position”

lamp

• End position

a) “End position” is reached (GG102), indicated through

appropriate lamp

b) Twin bridge motor MG101 and cable drum motor MG102

will be switched off

c) As well sludge scrapers MG201 and MG203, as scum shields

MG202 and MG204 will be lowered, if pre-selected

accordingly

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• Back to start movement

a) As soon the pre-selected scrapers and shields are lowered,

which is determined by the limit switches (GG202, GG204,

GG206, GG208), the back to “Start position” movement is

initiated

b) Twin bridge motor MG101 will start operation for the

backward movement

c) Cable drum motor MG102 will start operation together with

MG101 to keep the cable under certain tension

d) While the bridge is moving backward, the sludge scrapers are

pushing the sludge, accumulated at the tank bottom, towards

the sludge hoppers, and the scum shields are gathering he

floating scum from the surface of the tanks and conveying it

to the scum tray

e) Twin bridge will continue moving until the stop position is

reached (GG101), indicated by the appropriate “Start

position” lamp

f) All motors will be stopped, the sludge scrapers and shields,

which were in operation will be lifted up and the on-delay

timer (1 – 6 h) will be started again for the next automatic

start


• The package unit could be operated manually from the control

cabinet located directly on the bridge



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• Press “Start forward” or “Start backward” pushbutton to move

the bridge in the direction needed

• To lower or to lift up the sludge scrapers and scum shields

press and keep pressed the appropriate pushbutton provided.

The motor will stop automatically, as soon the lower or upper

limits will be reached.

• Use the appropriate “OFF” pushbuttons to stop the operation

of the units / release the pushbutton for the lifting or lowering

the scrapers or scum shields



• Remote control of the twin bridge


• “ON” pushbutton has the same function as the “Start”

illuminated pushbutton at the local switchboard on the bridge

• “OFF” pushbutton stops all the motors of the bridge at the same

time




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• “Run” signal

• “Fault” signal – collective fault

• “Auto” signal

• “Emergency stop” signal

• Incoming signal “Central Control OFF- Central Control ON”

• Incoming “Start” command

• Incoming “Stop” command

10. PH and temperature measurement system

The measured values of the pH and of the temperature of incoming waste

water are registered and indicated at Central Control Room.

7. Primary sludge pumping station – “K”

7.1 General

Primary sludge pumping station is the key element of the sludge treatment

process of the WWTP. The primary sludge will be removed from the

primary sedimentation tank for further stabilization. Stabilized and

dewatered sludge is removed and transported for further disposal. The main

task of the primary sludge pumping station is to convey the sludge from the

pump sump to the anaerobic digestion ponds.

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The primary sludge pumping station consists of a pump sump and of an

operation building, where one macerator and three eccentric pumps are

installed, whereby one of them will be considered as a stand-by pump.

The pumps are operated according to the sludge level in the pump sump.

7.2 Water levels

1. Water level in the sludge water pump sump

• W.L. 1.7 m (3.00m) –MAX, Alarm

• W.L. 1.2 m (2.50m) –Start 2nd

pump

• W.L. 0.5 m (1.80m) –Start 1st pump

• W.L. -0.8 m (0.5m) – MIN, Stop the pump

• W.L. -1.0 m (0.3m) – MIN MIN, Stop the pump, Alarm

7.3 Motors

MK100 – Macerator

MK101 – Primary sludge eccentric pump № 1

MK102 – Primary sludge eccentric pump № 2

MK103 – Primary sludge eccentric pump № 3 (stand-by)


LK100HY – Hydrostatic level measurement system

QK100Z Combined PH and temperature measurement

FK100G - MID DN 150, primary sludge flow rate measurement

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GV-K-001 – Gate valve at primary sludge outlet, sludge hopper 1





• To withdraw the primary sludge from the sludge hoppers of the

primary sedimentation tank according to the pre-set time and volume

schedules



The control system of the primary sludge pumping station is

installed at LV-MCC2 and consists of following features for

each motor:




• Ampere-meter


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The local control panels are installed in the direct vicinity to the equipment

to be operated and include following control and indication elements:


• Illuminated “ON” pushbutton




In case of emergency the primary sludge pumping station could be

immediately stopped, by pressing of the emergency switch foreseen:

• Emergency mushroom pushbutton, located on the appropriate free

accessible location n the pump hall of the pumping station







further operation.

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5. Level Measurement System

The hydrostatic level measurement system is installed in the pump sump of

the primary sludge pumping station. The main features of the system

comprise of:

• Measurement of sludge level inside of the pump sump


• Dry running protection of the pumps


• Pump operation according to the pump sump level

a) Pumps are operated within pre-set running hours to assure

equal operation hours for each pump

b) If pump fails to operate, it will be automatically locked out

and alarm signal will be given

c) Stand-by pump automatically takes the place of the failed one

d) The control of the pumps depends on the current sludge level

in the buffer tank, measured by the level measurement system

LK100HY

e) The Schedule operating of the pump to get permission for run

pumps after time –“delay start run”. The setting “Duration run” to

end permission. Run time of pumps determinates of “Period run”

then the rest time determinates “Period run delay”.

f) If the condition for the start of the pumps is fulfilled, the

macerator starts as the first unit and an on-delay time of 15

sec is activated

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g) As soon the delay time has expired, the appropriate pump

starts operation

h) The operation of the pumps is protected by the level

measurement system LK100HY


• The macerator and eccentric pumps could be operated

manually from the control cabinet LV-MCC2 or from the local

control panels




• The low level interlocks are active in Manual Mode



• Remote control of the macerator and pumps





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• FK100G MID primary sludge flow rate indication :

- m3 / h

8. Open digestion ponds - “Q1” – “Q3”

8.1 General

The raw sludge from the primary sludge pumping station has still the

biological activity. For further treatment and final disposal the stabilization

of the sludge is indispensably required.

The sludge stabilization will be done by anaerobic digestion. The volume

required for this process will be provided by construction of the three open

digestion ponds.

The mechanical equipment of the digestion ponds contains of the sludge

feeding piping with distribution gate valves, digested sludge withdrawal

piping and of the telescopic valves for the supernatant removal.

The digested sludge will have a dry solids content of about 5% after

digestion time of 30 days. For the next treatment step (sludge dewatering)

the digested sludge will be conveyed to the drying beds by gravity.

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8.2 Water levels

1. Water levels at the sludge digestion ponds

9. Max W.L. 6.4 m

8.3 Motors

None


KV-Q1-001 – Knife gate valve for surplus water withdrawal pond “Q1”



GV-Q1-001 – Gate valve for raw sludge feeding pond “Q1”




GV-Q1-005 – Gate valve for digested sludge withdrawal pond “Q1”







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• To control the feeding and distribution of the raw sludge over the

digestion pond

• To withdraw the supernatant water from the surface of the pond

• To withdraw the digested sludge to the drying beds for dewatering

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9. Sludge Drying Beds – “R1”-“R12”

9.1 General

In order to reduce the volume of the digested sludge prior to the final

disposal the sludge dewatering is necessary.

Roof covered sludge drying beds are constructed, the sludge dewatering is

achieved by natural evaporation and with an aid of the drainage system. In

total twelve drying beds will be constructed, to provide the necessary

volume. The max. sludge filling height is 30 cm.

The structure of the drying bed comprises as well holding and separation

walls as permeable filtering layer (gravel, sand) of 20 cm thickness for the

removal of the sludge liquor via the drainage system.

9.2 Water levels

1. Water levels at the sludge drying beds

10. MAX W.L. 2.60 m

9.3 Motors

None

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GV-R1/2-001 – Gate valve for digested sludge feeding drying bed “R1”+

“R2”

GV-R3/4-001 – Gate valve for digested sludge feeding drying bed “R3”

+”R4”


+”R6”


+”R8”


+”R10”


+”R12”

GV-001-200 - Gate valve in the main collection discharge drainage pipe

‘ DN 200


• To control the feeding and distribution of the digested sludge over

the drying beds

• To withdraw the drainage water from the bottom of the drying beds

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10. Sludge Water Pumping Station – “X”

10.1 General

In order to withdraw the surplus water from the digestion ponds

and the drainage water from the sludge drying beds a sludge water

pumping station is foreseen.

The sludge water will be pumped into the inlet channel of the

Primary Sedimentation Tanks.

The sludge water pumping station is equipped with two submersible

‘ pumps, one in operation and one stand-by

10.2 Water level

Water level in the pump sump

• -1,00 m min min W.L. dry run protection, Alarm

• -1,50 m min W.L. stop pump operation

• +0,50 m max W.L. start pump operation

10.3 Motors and Local Control Panels

MX 101 Submersible pump No. 1 with LCP MX 101Q

MX 102 Submersible pump No. 2 with LCP MX 102 Q

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LX 101F Float level switch 1 : min min – dry rum protection, Alarm

LX 102F Float level switch 2 : min – stop pump operation

LX 103F Float level switch 3 : max – start pump operation



The control system of the sludge water pumping station is

installed at LV-MCC2 and contains of following features for

each motor:




• Ampere meter


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The local control panels are installed in the direct vicinity to the equipment

to be operated and include following control and indication elements:


• Illuminated “ON-GREEN” pushbutton




In case of emergency the sludge water pumping station could be

immediately stopped, by pressing of the emergency switch foreseen:

• Main emergency mushroom switch, located directly at sludge water

pumping station







further operation.

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5. Level Measurement System

Three float level switches are installed in the pump sump of the sludge

water pumping station. The main features of the system comprise of:

• Measurement of sludge water level inside of the pump sump


• Dry running protection of the pumps


11. Pump operation according to the level

a. Pumps are operated within pre-set running hours to assure equal

operation hours for each pump

b. If pump fails to operate, it will be automatically locked out and alarm

signal will be given

c. Stand-by pump automatically takes the place of the failed one

d. The control of the pumps depends solely on current liquid level in the

pump sump, determined by the level measurement system LX 101F –

102F – 103F

e. The operation of the pumps is protected by the level measurement

system

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• The submersible pumps could be operated manually from the

control cabinet LV-MCC2 or from the local control panels




• The low level interlocks are active in Manual Mode



• Remote control of the pumps





9. Interface to MIMIC



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ON”



11. Outlet (effluent) chamber – “Y”

11.1 General

The effluent pipe DN800 from the primary sedimentation tanks is

connected to the collecting manhole. From there the water is being

discharged via DN800 reinforced concrete pipe to the Maspero River.

11.2 Water levels

1. Water level in the collection manhole




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2. Water level in the Maspero River

• 1,80 m max W.L.

11.3 Motors

None


QY100S Stationary automatic sampler station No. 2


1. Stationary automatic sampler – QY100S

• Automatic waste water sample collection for laboratory analysis

Modified by Mr. Anatoliy Grebnev, Soc Trang, 20.06.2013

Commissioning Soc Trang Town Wastewater Treatment Plant Wastewater Disposal in Provincial Towns,...

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