Design of faecal Sludge Treatment Plant - Please share your experience in case you have used aerobic lagoon?

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  • Mayor610
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Design of faecal Sludge Treatment Plant - Please share your experience in case you have used aerobic lagoon?

 Dear all,

We as detailed Engineering Design consultants are involved in designing FSTP in East Asian tropical country where the client has got distracted by the earlier design given in the Master plan which advocates the use of facultative primary lagoon followed by aerobic lagoon for the treatment of faecal sludge.

While as learnt from my Indian experience where the climate is similar with the only difference that in this part of the world, the rainy season is longer i.e. up to 05 months in a year. there are a number of FSTP which are working satisfactorily using
[1] screening & grit chamber,
[2]Stabilisation reactor( for anaerobic digestion of sludge),
[3]Sludge Drying Beds [ for dewatering the sludge) ,
[4] Integrated Anaerobic baffle reactor with filter chambers( for secondary treatment) ,
[5] Planted Gravel Filter & Activated carbon filter ( Tertiary treatment ),
[6] UV radiation( for killing of pathogens and Helminth eggs) and lastly
[7] Co-composting Unit /Sludge pasteurization Unit.

With some  small variation here in there , a number of FSTPS have come up in India and are  working satisfactorily and generating bio solids which can be used as soil conditioner and treated effluent which is being used for irrigation purpose.

Please share your experience in case you have used aerobic lagoon .
With regards,

Mayor Kumar
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  • Elisabeth
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  • I'm passionate about SuSanA's role in the WASH sector since about 2005. I'm a freelance consultant since 2012 (former roles: program manager, lecturer, process engineer for wastewater treatment plants)
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Re: Design of faecal Sludge Treatment Plant - Please share your experience in case you have used aerobic lagoon?

Hi Mayor,
Thank you for sharing your experiences with the design of a typical faecal sludge treatment plant. Did the said master plan stipulate facultative primary lagoon for the supernatant after dewatering or for the faecal sludge itself? A lagoon before dewatering would seem a bit strange to me unless the faecal sludge is very watery? Where is the faecal sludge from; is it from septic tanks?

Please clarify your question and then I hope more people will be able to comment and assist in this thread.

And did you see this interesting report by EAWAG?: 
Evaluation of Faecal Sludge Treatment Plants in South-Asia and sub-Saharan Africa: Scoping Study Report
I haven't read it in detail yet. Did any of the FSTPs that were analysed in this report use aerobic lagoons?

(for anyone unfamiliar with those lagoons, I recommend this Wikipedia article for a quick little overview:  https://en.wikipedia.org/wiki/Waste_stabilization_pond )

Regards,
Elisabeth
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Dr. Elisabeth von Muench
Independent consultant located in Brisbane, Australia
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