BWSSB

A pilot project area comprising 40,000 connections in Bangalore City covering Service Station of Clive Line Reservoir, Johnson Market, Ulsoor ,High Grounds and Coles mark, is proposed to be implemented on a trial scheme to reduce the
existing leakages and also to bring into Bangalore through project Global experiences covering entire exercise. This would address twin parameters of conserving water and also enhance customer satisfaction (increasing water revenue) in the city.

CWSS Stage-IV Phase-1	Infrastructure Mapping	Recycling Treatment Plants
	French Funded Projects

Recycling Treatment Plants

Koramangala & Chellaghatta Valley

Vrishabhavathy Valley

Yelahanka Satellite Town

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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