Want help with STP design for a restaurant in Kerala, cannot have soak pit as it very close to the river, need suggestions

Hello,

I own a restaurant and lodge in Alappuzha dist of Kerala. I do not have a proper drainage system, so thinking of installing a Sewage Treatment Plant but my shop is very close to a river, about 20 meters approximately from the back and the area is prone to water level rising during monsoon. Due to this we cannot have a soak pit for treated water and also cannot drain the treated water into the public drain legally. Need suggestions to tackle this issue.

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