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Treatment of Grey Water for Gardening Purposes

I live in a society in Delhi. We wanted to reduce our water consumption and decided to recycle Kitchen Waste water from a block of 6 flats and use it for the greening of an adjacent garden. We channelled the water into a tank and did some basic treatment like addition of alum and filtration using a sieve/wire mesh. This water we then led to a storage tank from where we could draw water using a motor.

Although the scum and oiliness/greasiness reduced, but there is a lingering smell in the storage tank. We also found out that the BOD level of the water was still too high for it to be used for garden greening after we got the water tested. We were advised to use pot chlorination method i.e. a container containing coal and bleaching powder in a container with holes on its periphery. This, we were told, would reduce the smell and help heavier particles settle. However, I am unsure about the use of bleaching power as it may harm plants.

Kindly advice on what further action is required?

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Comments

1. Test Report?

Hi Abhishek Kaul,

Could you kindly post the test report results as a comment so that the experts on the forum ara able to understand the siutation is better.

2. Grey Water treatment

Dear Abhshek,

With a grouping of 6 flats, my estimate is that your daily generation of grey water could be upto 2400 litres.With this volume, if residents of all 6 flats pooled resources, you could get a company to install filters,chorine dosers etc and also aerate the grey water which you now collect in a tank which you call " storage tank".After this you should pump out this water through a pressure sand filter,chlorinate it and then pass it through an activated carbon (charcoal) filter an store it in another tank for further uses like gardening, washing yards/roads and, if you are really interested in saving/reducing fresh water consumption, use treated grey water also for toilet flushing.There is no need to use 'crude' equipment for this purpose as these are inefficient unless used for a single house hold.

For toilet flushing you would have to install an overhead storage tank (ideally a sintex tank) and lay piping a) from your treated grey water storage tank to the overhead storage tank, and b) from this overhead storage tank to each of the flush tanks in the toilets in your building.With all this in place there is a good chance that your overall water consumption could drop by as much as 50 to 60%.

If you need help to get this done, I could put you in touch with a company which could do this for you in Delhi.

Regards

S.S.Ranganathan

Water Management Consultant

093437 34229

S.S.Ranganathan

3. Packaged type sewage treatment plant for domestic house hold

One can use packaged type sewage treatment plant for domestic house hold purpose.

  • Treated water can be used for flushing or gardening.
  • Plant can be installed underground, as it does not smell.
  • Sludge removal at interval of 24 months, long last durable life.
  • Rust proof, leak proof can be installed under car park or garden.

 This small plant one can find from companies like Sintex etc.

Thanking you,

A R Jignesh Goyani

jgoyani@yahoo.com

9898246050

Goyani group

4. Can you guide me on setting up water treatment projects?

Hi Rangnathan

I am looking at an opportunity for working in water treatment field as I have experience in this for around 6 years. I am willing to set up my own company to work for water treatment projects. Is there any way in which you can guide me?

Best regards,
Deepak
9810705001

5. Dont Do that!!!!! You should construct a Wetland Instead.

Hallo,

Never Store waste water from Kitchen. The Kitchen waste contains lot of Bacteria, Pathogen and storing them will multiply and this is literally a Drainage quality water. And this water should not be directly applied to plants and risk Ground water contamination. 

The best thing is to construct a Constructed SubFlow wetland And reuse water. 

with regards,

Pragati Prasad

Pragnya Energy and Environment Pvt Ltd.

6. Treatment of grey water for gardening purposes

Your total generation of grey water (i.e. water used for uses other than for flushing of closets) would depend on the no of occupants in the six flats. You can assume this to be either 50% of the total water consumption (65% if washing machines are used) or about 60 litres per person (75 if washing machines are used). Why are you considering only treatment of outflow from the kitchen as this constitutes only about 10% of the total usage and besides contains a higher amount of organics (nutrients) than water used for bathing and washing of clothes.  You can use this component for treatment advantageously.  There is a simple, practically self-sustaining process available for treating this which involves no chemicals or power but needs only water loving plants like Banana or Canna, sunlight and soil space at the rate of 2.5 square feet of soil space.

The treated water can be allowed to percolate into the soil. The outlay for this is very marginal. If you wish to collect it, you will have to build a sump to collect it, a pump to take it to a tank on the terrace and plumbing lines from the tank to the closets. If enough space is not available for treating the entire quantity, you can treat whatever is possible.

This process is operating in several complexes in Chennai. If interested, you can contact me.

7. I would like to see the system in Chennai

Yes, I would like to see the system in Chennai. Please give me your number.

8. Treatment of Grey Water for Gardening Purposes

Dar Abhishek Kaul,


Kitchen waste water is always will be having lot of OIL/FAT/Grease(OFG). These waste water is in anaerobic condition and difficult to degrade these OFG naturally. when you use this water for gardening OFG will also pumped in to garden and plant may not survive because of OFG.


You need to degrade OFG from the kitchen waste, this will reduce the smell and will be good for gardening purpose. Bio cultures are available in India for degradation of Kitchen waste which will give you permenant solution.


With Regards


Hiren Pancholi(09371061789) 

9. Your total generation of grey

Your total generation of grey water (i.e. water used for uses other than for flushing of closets) would depend on the no of occupants in the six flats. You can assume this to be either 50% of the total water consumption (65% if washing machines are used) or about 60 litres per person (75 if washing machines are used).

Why are you considering only treatment of outflow from the kitchen as this constitutes only about 10% of the total usage and besides contains a higher amount of organics (nutrients) than water used for bathing and washing of clothes.  You can use this component for treatment advantageously.  There is a simple, practically self-sustaining process available for treating this which involves no chemicals or power but needs only water loving plants like Banana or Canna, sunlight and soil space at the rate of 2.5 square feet of soil space. The treated water can be allowed to percolate into the soil. The outlay for this is very marginal. If you wish to collect it, you will have to build a sump to collect it, a pump to take it to a tank on the terrace and plumbing lines from the tank to the closets. If enough space is not available for treating the entire quantity, you can treat whatever is possible. This process is operating in several complexes in Chennai. If interested, you can contact me.

10. Grey water treatment using bio-culture

Hello Abhishek,

First you need to have a bar-screen chamber to prevent bigger solids from coming in and then a baffled grease trap to separate oil and grease. In this grease trap you may use our slow release tablets which contains bacteria that degrade oil and grease, soaps and detergents i.e it degrades the contaminants of grey water. The collected water from the grease trap may be chlorinated and re used, filtered/unfiltered.

You may contact me at 9910170604 for further discussion.

Thanks and regards,
Chandan

11. Need guidance to set up affordable STP for 120 bed hospital

We have 120 bed hospital and practically the sewage is being dumped in river.

We have some land and would like to solve this problem,any guidance will be appreciated.

Arjundev Bhakta

12. Contact us with your requirement to set up STP

Dear Arjundev,

Please send us your detailed requirement, capacity planned in STP to asemktg.ase@gmail.com and we will respond to query ASAP.

Best Regards,
Mohankumar
ASEWater Technologies Pvt ltd
Chennai 044-42036821

Mohankumar

ASE Water Technologies Pvt ltd,

044 42036821

Chennai

www.asewatertech.com

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