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Sewage Treatment Plant at Vasant Kunj Back
Client Delhi W. S.& S. Undertaking (MCD);  BAPL
Capacity 10 MLD
Location New Delhi, India
Approx. value Indian Rupees 10.5 Million
Design criteria  
Normal flow (m3/d) 10,000
Peak flow (m3/d) 20,000
Characteristics of raw sewage  
BOD5 (mg/L) 200
Total solids (mg/L)  1600
Suspended solids(mg/L)  400
pH 7.5
Treated effluent characteristics   
BOD5 (mg/L) 20
S.S. (mg/L) 30

Brief treatment process
 
The raw sewage is received by gravity at the inlet works where it is screened and de-gritted using manual screen & Detritor mechanism for removal of large sized particles & grit. Screened & de-gritted sewage is then taken to an aeration tank designed on “extended aeration process” basis. The aeration tank is equipped with surface aerators. The effluent then proceeds to the secondary clarifier for sludge settling and clarification of sewage. Dewatering of the excess sludge is achieved in sludge drying beds. The treated effluent from clarifier is discharged into the treated effluent channel. A provision has also been made to pump this  treated sewage for use as irrigation water.

Major Unit /equipment

No. of units

Size (m)/ type/capacity

MOC / make

Bar screen & Detritor

1+1 set

-

RCC/HDO

Aeration tank

2 , 8 aerator

66*16.5*3.49 LD, 8 @ 25HP

RCC/ HDO

Secondary clarifier

1, mech.

28.3 f , central drive

RCC/HDO

Sludge drying beds

8

21.4*11

Brick wall

Return sludge sump and Pump house

1(4-2+2 pumps)

Sump7*2, dry well 7*4 pumps Horizontal centrifugal

Kirlosker/SHD/100/26N

Treated effluent pumping station

1(5-3+2 pumps)

Sump12*2.5 Pump house 12*5 Horizontal, Centrifugal

Kirlosker/KP D125/ 40N

Filtrate sump and pump house

1(2-1+1 pumps)

Sump 3*2, Pump house 3*4 Horizontal, Centrifugal

Kirlosker/SHD/50/26N

Sub station, Transformer

1

11/0.4KV, 1000KVA

GEC

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