I don't like to be a damp squib but this project sounds like very old hat. The wastewater treatment process that works best in the Indian climate is activated sludge or a variation on that process. Trickling filters etc do not work well. Going beyond this into more complex methods simply misses the point - India is crying out for basic processes to treat its sewage and clean up its rivers - not more advanced technology. The reuse of treated wastewater for agriculture has been well understood for decades and the regulations for it are available on-line. It's reuse in the domestic area is more problematic but this is easily overcome if the treated effluent is discharged back to the environment and diluted around 10:1 whence it becomes part of the available resources . The UK has been doing this for well over a century. Reuse for industry involves advanced treatment, usually RO which produces a high quality process water but this is generally too expensive for domestic use (unless of course you live in the Gulf region where water is more expensive that oil).

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I don't like to be a damp squib but this project sounds like very old hat. The wastewater treatment process that works best in the Indian climate is activated sludge or a variation on that process. Trickling filters etc do not work well. Going beyond this into more complex methods simply misses the point - India is crying out for basic processes to treat its sewage and clean up its rivers - not more advanced technology.

The reuse of treated wastewater for agriculture has been well understood for decades and the regulations for it are available on-line. It's reuse in the domestic area is more problematic but this is easily overcome if the treated effluent is discharged back to the environment and diluted around 10:1 whence it becomes part of the available resources . The UK has been doing this for well over a century.

Reuse for industry involves advanced treatment, usually RO which produces a high quality process water but this is generally too expensive for domestic use (unless of course you live in the Gulf region where water is more expensive that oil).