Decentralised Wastewater Treatment System at Varunalaya, Delhi Jal Board

May 20, 2016

 
Location: Varunalaya, DJB’s Head Office, Jhandewalan, New Delhi
Scale: Site Scale
Implementing organisation: Delhi Jal Board with technical advisory from Centre for Science and Environment
Designed Capacity: 8 KLD
Area : 2690 sq. m
Operational since : 2015
Capital cost : Rs. 16,00,000
O&M: Not known yet
 
 
The wastewater treatment system at Delhi Jal Board’s Head office at Jhandewalan, implemented in 2015, has been designed to treat 8000 litres per day to cater to the horticultural requirement inside the campus. Toilet wastewater from the Phase I office building is treated through various treatment modules that include a settler, an anaerobic baffled reactor and a planted filter bed. The model project showcases wastewater treatment for urban local reuse for institutions.
 
 
The wastewater enters a two-chambered settler for removal of suspended solids which is followed by its flow into an anaerobic baffled reactor (ABR). The ABR at the site is five chambered which facilitates anaerobic degradation of the organic impurities and reduces about 60-70% of the BOD and COD levels of the wastewater. The treated water is further improved as it passes through the planted gravel filter (PGF) bed. The PGF at the site has Canna and Typha plantations. The treated water is stored in a collection tank.
 
 
8,000 litres of wastewater that is treated and reused. The quality analysis result showed that the efficiency of the system is about 80% in terms of BOD and COD removal. Various water quality parameters tested before and after treatment are shown in the table below:

Parameters

Before

After

pH

7.4

7.5

BOD (mg/L)

110

23

COD (mg/L)

344

96

Total Suspended Solids (mg/L)

376

97

Ammonia (mg/L)

30

20

Phosphate

Traces

Nil

Faecal Coliform (per 100ml)

3600

93

 
 
Public Relation Office
Delhi Jal Board, Varunalaya, Phase-II
Karol Bagh, New Delhi
Email: prodjb114@gmail.com, prodjb306@gmail.com
 
Water Programme
Centre for Science and Environment,
41, Tughlakabad Institutional Area, New Delhi-69
Email: water@cseindia.org, chhavi@cseindia.org

 

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