Decentralised Waste Water Treatment > Case Studies

8 KLD Decentralized Wastewater Treatment System (DWWTs) at Delhi Jal Board (DJB) Headquarters, Varunalaya, New Delhi

 

Scale of service

Institutional

Area of installation (Sq-m)

N/A

Year of Installation

November, 2015

Capital cost

Rs. 16 Lakhs

Location

Delhi Jal Board, Varunalaya Phase I, Jhandewalan, New Delhi

Operational & Maintenance cost

N/A

Funding Agency

Delhi Jal Board

Design Capacity

8 KLD

Knowledge Partner

Centre for Science and Environment (CSE)

Coordinates

28.649994,77.202064
 
 
The Decentralized Wastewater Treatment system (DWWTs) at DJB’s head office at Jhandewalan, was designed to treat 8000 litres of wastewater per day. The system was developed as a Model Project to showcase decentralized wastewater treatment and local reuse. Wastewater generated from the toilets of Phase I office building is treated through nature-based system before being used for horticulture purposes within the office premises.
 
 

The treatment takes place in three units – a settler with two chambers, an anaerobic baffled reactor (ABR) and a planted gravel filter (PGF) bed. The settler and ABR are underground units while the PGF is constructed over the surface.

Settler: The settler offers sedimentation i.e. primary treatment for the wastewater. Wastewater from the building enters a two chambered settler that offers enough time for the settleable solids to settle down under gravity.

Anaerobic Baffled Reactor (ABR): The ABR provides secondary treatment for the effluent from the settler. The five chambered ABR contains filter materials (gravels and pebbles) in the last two chambers. Wastewater flows from chamber to chamber where the anaerobic microbes biodegrade the organic content. A sludge blanket is formed at the bottom when the remaining solids settle down. The filter present in the last two chambers prevent the sludge from leaving the ABR. As time passes, this settled sludge get activated and helps in further bio-degradation.

biodegrade the organic content. A sludge blanket is formed at the bottom when the remaining solids settle down. The filter present in the last two chambers prevent the sludge from leaving the ABR. As time passes, this settled sludge get activated and helps in further bio-degradation.

Planted Gravel Filter Bed (PGF): The partially treated wastewater passes through the PGF for secondary/tertiary treatment. The PGF consists of crushed stones, pebbles and wetland plants – Canna Indica, Typha. These wetland plants offer further treatment by removing the Phosphates and Nitrates from the wastewater.

Storage Tank: The treated wastewater is stored in a storage tank from where it is used for horticulture purposes within the office premises.

 
 
 

The DWWTs has helped in sensitizing the DJB staff and visitors on the innovative decentralized wastewater management and has also improved certain social perceptions regarding wastewater treatment.

S. No

Sample Location

pH

TS
(ppm)

TDS
(ppm)

TSS
(ppm)

COD
(ppm)

BOD
(ppm)

TKN
(ppm)

Ammoniacal Nitrogen
(ppm)

Total Phosphate
(ppm)

Fecal Coliform
(MPN/100 ml)

1

ABR Inlet

7.52

964

516

448

178

133

34.65

30.25

2.68

43000000

2

PGF

7.9

861

501

360

96

34

32.41

30.48

2.37

9300000

3

Outlet

8.12

608

327

281

56

6

5.22

2.2

1.32

4300

                                                                                          (Sampling was done on 22nd August, 2019)

 
 
 

Name: Mr K U Khan
Mobile No:  +91 9650291051                                  
Email Id:  eecdr2@gmail.com                             
Address: Delhi Jal Board, Varunalaya (Jhandewalan), New Delhi
Website: http://www.delhijalboard.nic.in/
 

 

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