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Is usage of activated carbon filter in sewage treatment plant recommended?
ShareDear Sir,
I live in an apartment which has 85 flats. We have an STP unit in our apartment, however, the builder has not connected the STP unit to the flush/commode lines. Till now the STP output has been primarily used for gardening. The residents have recently taken over the associations and we are now going ahead with connecting the STP output to the flush tanks/commodes.
Our STP water report till date has been positive (i.e. meeting the required criteria). The initiative to connect the STP output to the commode/flush tanks is meeting some resistance/apprehensions from some residents because we still see the STP output water has got some yellow taint and it does have some odour.
To handle this we are thinking of installing an activated carbon filter in the STP. However carbon filters are costly and we have some doubts.
Can you please guide us here. We need inputs on
a) Is usage of activated carbon filter in STP common/recommended?
b) Is there any way of making the water colorless/odourless without usage of carbon filter (we have a sequential batch reactor with a sand filter at the end)?
Thanks and regards
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Dear Mr. Jacob,
You can use your waste water twice. There are two types of waste water in your colony's effluent.
1) Waste water comes from kitchen, bathroom and laundry is called as 'grey water'.
2) Waste water comes from toilet is called as 'black water'.
3) Grey water can be treated using 'Root Zone Technology'. This treated water can be reused in toilet flushing. In this system no use of energy required.
4) Toilet waste water, that is, Black water can treated by FABR technology. In this system very low energy is required in comparison to Traditional STP system. This system works on biotechnology. This treated water can be used in gardens. Hence there is 'ZERO DISCHARGE'.
5) Both system can be installed in your campus, subject to availability of place.
6) Root zone system construct on Ground, FABR system construct underground.
7) Your daily consumption of water should not be more then 51,000 liters daily. Its mean, you can save approximately 25,500 liters of water daily with root zone system.
This collected water can use in bathroom activities.
We are well aware about apartment systems and we also help with rain water harvesting.
If you are interested to know in detail, write to us on greentechsolutions@rediffmail.com; Contact no 7665119966
Shyam Agrawal
Yes, you can safely apply it and we had done this at the Dow chemials plant site with 100% success and it is not a costly affair.
Dear Jacob,
I have come across many cases like yours in Bangalore where the builder has 'short changed' the residents of the apartment by not providing a separate tank on the roof to store treated sewage with separate plumbing to take the treated water to all the flush tanks in your apartment complex. It is good to know that your association is going ahead with making this available.
In the second para of your mail what you have mentioned is not possible. Unless you get the 'so called treated sewage' tested in an authorised water testing lab, you can not say that the STP is working. In fact, the statement that your STP water has a yellow tint and some odour is a clear indication that the STP is not working. I am a Water Management Consultant and know what I am saying.
About the inputs you have requested:
a) Yes, an activated carbon filter is essential for an STP as the final stage of treatment.There are no cheap activated carbon filters and regardless of cost you need to install one.
b) You can make the water colourless and odourless by first of all getting professional operators for the plant and also by installing an activated carbon filter.
If you need help, contact me on 9343734229.
Regards
S.S.Ranganathan