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Ground water recharging

Dear All,

My query is what is the standard for recycled water which is to be used for flushing. Weather Govt

 of india has formulated any law regarding this .

2. This recycled water can be discharged in water bodies if yes than what is the prescribed standard.

3.what is the best Treatment process which can allow sewage water to be rechage in ground and what

   are the prescribed standard.

Regards

Rakesh

 

 

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1. Ground water recharge using treated sewage

I am a water management consultant operating from Bangalore.I am not aware of any Govt. standards/specifications for the quality of treated sewage that can be used for recharging ground water.

I would not recommend recharge of ground water using treated sewage unless it can be treated so as to consistently conform to BIS-10500 which is the Indian standard for water used for domestic use and consumption.Treated sewage which is to be re-used/recycled for non potable uses is subjected to tertiary treatment after it is treated by a Sewage Treatment Plant (STP).After this treatment, ultrafiltration is the process which would produce water to conform to BIS-10500 after disinfection by a method such as ozonation.

The cost of Ultrafiltration and disinfection using Ozone would be so high that it would be far better for drinking and other uses that require potable water.The city state of Singapore meets approx 30% of its drinking water requirements by treating sewage.

S.S.Ranganathan

S.S.Ranganathan

2. Ground water recharging

Thanks for your reply.But I like to know as per the township policy now a days 120% of water is to be recharged of the extracted water . If the sewage treated water is not permitted so from the rain water it will be impossible to achieve .Are you having any view on this ?

3. Ground water recharge using treated sewage

Re-charge of ground water to the extent of 120% is with the intention of ensuring that ground water recharge exceeds withdrawal.With the phenomenal growth/development of cities and towns, vast areas of land are now covered/paved over and this results in a drastic reduction in the rate of natural ground water recharge.

It is possible to meet this 120% with  harvested rainwater if the harvesting system is well designed and recharge is done consistently.Obviously, water consumption must be controlled and reduced to the maximum extent possible.Instead of attempting to use treated sewage to re-charge ground water, it must be re-cycled for uses such as toilet flushing, gardening,washing of roads and yards etc.This is possible with installation of dual piping such that potable quality fresh water is used only for uses that require such water and treated sewage is routed through the second piping system for non critical uses.

S.S.Ranganathan

S.S.Ranganathan

4. use of recycled water for lower- end uses

Dear Members,


It is with interest, we have observed meaning ful discussions on this subject.


When in an apartment complex. if dual watr supply lines are laid, then the


recycled water can be used for flushing etc...


Ideally for uses like gardening, washing paved roads, perodical washing down


trees and its elements all thes cab be met using recyled watr...


with well wishes, Ajit Seshadri- www.vigyanvijay.org 

Er. Ajit Seshadri,Head- Environment, The Vigyan Vijay Foundation

5. Rain water Harvesting

Dear Member's


My querry is in a project how Zero discharge theory can can be implemented .if extracted ground water which turn in the sewage after use  is not to be recharged after giving reqired level of  treatment .I request member's to provide input with example .


Regards


Rakesh


 


 

6. Ground water recharging

 In Tamilnadu, the Pollution Control Board has three standards has three standards for the disposal of sewage :

1. Discharge into water bodies, which is the most stringent;

2. discharge on irrigated soil; and

3. discharge on unirrigated which is the least stringent.

I am sure that the Karnataka Pollution Control Board will also have similar norms.

As for standards for flushing the closets, there are no norms but one condition must be kept in mind:The water should not be contaminated wirh sewage. In fact, water used for bathing and washing of clothes can be used straight away for flushing. It should not however be kept longer than a day as it will develop an unpleasant smell.

Indukanth Ragade(isragade@yahoo.com

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