Recycling Treatment Plants
# Koramangala and Challaghatta waste water Treatment Plant
Bangalore Water Supply and Sewerage Board has set up a sewage treatment plant
to treat the sewage generated in Koramangala and Challaghatta valleys of the
Bangalore city at Belur Nagasandra village behind Bangalore Airport. This treatment
plant caters to a population of about 13,00,000 (1991 census) over a drainage area
of 8858.83 Hectares.
The treatment plant with primary treatment facility for 35 MGD was commissioned
during 1974. The upgraded secondary treatment plant was commissioned during 1990.
The K & C valley sewage treatment plant has been designed to treat 163 MLD of
sewage. The treatment process adopted is the conventional activated sludge process.
Presently, the treatment plant is receiving an average of 160 ML of sewage per day.
The average BOD and suspended solids in the influent sewage is 250 Mg/1t and
425 Mg/lt respectively. There is an average reduction in BOD of 88% and suspended
solids of 80% in the treated effluent.
Salient features of the Existing Plant:
1. |
Description |
163 MLD Capacity secondary sewerage treatment plant at K&C Valley near Belandur Tank. |
2. |
Area Available for installing Recycling Treatment Plant |
9 Hectares |
3. |
Drainage Zone Area |
8858.83 Hectares |
4. |
Population Served |
13 Lakhs |
5. |
Domestic Flow including other sources of Water Supply from wells etc.. |
135 MLD |
6. |
Industrial Flow |
28 MLD |
7. |
Total Average Flow |
163 MLD |
8. |
Peak Factor |
2.25 |
9. |
Raw Sewage Characteristics
BOD 5
S.S. |
340 Mg/litre
440 Mg/litre |
10. |
Diameter of Inlet pipe (out fall sewer) |
2000 mm RCC spun pipes of NP-2 Class |
11. |
Invert level of the Pipe at Entrance Screens |
R.L. 875.15 mt |
12. |
Year of Commisioning |
1990 |
13. |
Unit process for Treatment (Biological treatment) |
Conventional mixed flow, activated Sludge Process |
14. |
Existing Treatment Units |
Inlet Channel, Screens, Detritors designed for 218 MLD Flow |
a) |
Inlet Channel |
1 No,2.7 mm x 1.20 m 106 mt long |
b) |
Screens |
Coarse 3Nos.2.40 mt wide, 50 mm opening |
|
|
Fine 3Nos.2.40 mt wide, 25 mm opening |
|
|
Mechanically operated with belt conveyor for disposal of screenings |
c) |
Detritor |
2 No. 15m x 15m with reciprocating grit classifier |
d) |
Primary Classifier |
3 No, 3.63 mt x 3.63 mt x 3.04 mt size square type |
|
Detention Time |
2.45 hours |
e) |
Thickened sludge pumphouse
Pumps |
Wet well 6 mt x 2 mt, Dry well 6 mt x 5 mt . .
2 No.20 HP each 15 lts/sec against 18 mt head |
f) |
Recirculation pump house
Pumps
Recirculation Ratio |
Wet well 14 mt x 5.2 mt, Dry well 14 mt x 11.5 mt
2 No.340 HP each 900 lts/sec against 20 mt head
0.50 |
g) |
Sludge drying beds |
40 No.40.70 mt x 35 mt |
15. |
Efficiency |
BOD 5 removal 95% |
|
|
SS removal 92% |
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