Muhammad Imran Nawaz

Student of BSc. Environmental EngineeringUniversity of Engineering & Technology

Lahore

KTWMA

•Kasur Tanneries Waste Management Agency

Establishment

•The government of Pakistan and United Nations Development Program (UNDP) signed the Kasur Tannery Pollution Control Project document in January 1996.

•UNDP allocated US$ 2.5 million, whereas the local input was Rs. 199 million.

Inflow Wastewater

•Comes in two drains from the Tanneries.

•Two drains comes side by side along the road coming from tanneries to the treatment plant

Flow measurements

•Drain 1 :

Width = 145 cm = 1.45 m Depth = 54 cm = 0.54 m Velocity of wastewater = 0.13933 m/s

▫Flow = 0.1091 m3/s= 9426.32 m3/d

Flow measurements

•Drain 2 :

Width = 90 cm = 0.9 m Depth = 54 cm = 0.54 m Velocity of wastewater = 0.28575 m/s

▫Flow = 0.1388 m3/s= 499.94 m3/hr= 11998.75 m3/d

Flow measurements

•The total discharge coming towards treatment plant is:▫From Drain 1 ( Q ) = 9426.32 m3/d▫From Drain 2 ( Q ) = 11998.75 m3/d

= 9426.32 + 11998.75

Total Discharge = 21425.07 m3/d

Discharge inflow drain

Bar screening

•Manual bar screening:

▫ Larger suspended particles are removed▫Pore size is of 60 mm▫Removes about 90 % of the suspended

particles▫This is done manually

Manual bar screening

Manual bar screening

Bar screening

•Mechanical bar screening

▫After Manual bar screening mechanical bar screening is done

▫The pore size of mechanical bar screening is 6 mm

▫About 95 % of suspended solids are removed

Mechanical bar screening

Distribution of wastewater to the aeration Tanks

•A gate valve is installed to control the flow

• further WW is distributed into two drains which goes to the Aeration tanks

Distribution of wastewater to the aeration Tanks

Aeration Tanks

•There are two large aeration tanks•Each tank has 8 surface aerators•WW is spread in the aeration tanks and

aeration is done•Detention time is of one day

Aeration Tanks

•Dimensions of each tank:▫Width = 32.5 m▫Length = 65.0 m▫Depth = 4.7 m▫Volume= 6337.5 m3

•Total volume of both tanks = 12675 m3

Aeration Tanks

Aeration Tanks

Aeration Tanks

•Surface Aerators

Aeration Tanks

•Surface Aerators

▫There are 16 aerators in both the tanks▫Power is 30 KW▫Oxygen transfer is of 1.6 kg O2 /Wh

Pumping system

•Wastewater is pumped from the aeration tanks to the sedimentation tanks.

•Three pumps installed for this purpose•Two pumps are working and the third one

is a stand by pump.

•Each pump has :

▫Flow = Q= 350 m3 /h▫Head= 12 m▫Two pumps has a power of 18 KW▫One pump has a power of 24 KW

Pumping system

Distribution of wastewater to the sedimentation tanks

Sedimentation tanks

•There are two sedimentation tanks•Each tank has dimensions of :

▫Diameter = 18 m▫Depth = 3 m▫Volume = 611 m3

▫Detention time of 5 – 7 days

•The equalized effluent is entered to the clarifier for settling under gravity

•settled sludge is scrapped from the bottom of the tank with the help of the sludge scrapper.

Clarifires

Clarifires

Weirs / V-Noches

Wastewater Lagoons

•Water from clarifiers goes to the wastewater lagoons

•There are 32 lagoons, 16 on each side.•Totally natural process occur in lagoons in

which the water is placed in the lagoon more than 5 days and during this time period many inorganic and biological reactions take place.

Wastewater lagoons

•The organic layer is laid on the bedding and then water is placed on it the function of this geo layer is that wastewater will not seep into the soil.

Organic Layer over bedding

Collection of water from lagoons

Collection of water from lagoons

•After collecting water from the lagoons it is made to fall in the PANDOKI Drain

•Which after all goes to SATLUJ River.

Sludge collection and sludge lagoons

Sludge Lagoons

Sludge Lagoons

Dumping Site

Flaws

•ETP is not working properly

•Half of the wastewater is used to bypass threough the Pandoki Drain directly without any treatment.

Bypass of wastewater

Pandoki Drain