What is the plan for interceptor drains at Delhi

What is the plan for interceptor drains at Delhi. It is basically ,

 

1. laying of parallel drains along three main drains --Najafgarh, Shahdara and supplementary drain

2. the interceptor drains will intercept the outflow of all small drains before they meet these main three drains.

3. the interceptor drains will carry the sewage to STPs

4.From the STPs, treated waste water will be released to these three main drains --Najafgarh, Shahdara and supplementary drain

5. From these main drains, the treated waste water will go to the river Yamuna as it is flowing today.

 

70% of the small drains will be intercepted and 85% of the total generated sewage of Delhi will be treated in this way.

 

I helped one of my associates in chennai in an internatioal tender last year . I feel that the method of  treating waste water before it reaches yamuna should be like this. If you notice in the tender, there is just one interception at the end of the main drain before it meets the river.

 

In our case, the treated sewage from the STPs will be released to the main drains again where it will get mixed with untreated sewage from small drains that are not intercepted ( 30%) .This is the major flaw of the present scheme.

 

I was searching for this Manila tender for a long time to give it to you. This morning at 6 o clock, while searching through my old files I came across this file suddenly. Lets hope it will help you. I believe in Destiny. Everything is destined to be get done at an appropriate FIXED time.

 

There is a flaw in the manila tender also. In a highly centralised system, we cant recycle the whole load as it will require another network of pipes to carry the treated waste water back into the city.Do you think its feasible in Delhi?

 

I know from our very first meeting whats going on in your mind.You are interested in treatment of waste water at the source itself before it reaches even the interceptor drains.What you are thinking of is a network of decentralised very very small STPs all around Delhi managed by local communities. And its easy to recycle some parts of treated waste water from these small STPs at the community level .

 

Are there any new thoughts ? As you travel a lot outside India, maybe you are having more ideas.

 

Saleem Asraf Syed Imdaadullah,
M.E.(Env. Engg.)
Mobile: 9899300371
New Delhi, India
TECHNICAL BLOG : LOTS OF INFO ON WATER TREATMENT
www.saleemindia.blogspot.com
www.vermisindia.blogspot.com

 

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