What is the best ...

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What is the best decentralized treatment solution for a city which is already built without a centralized sewage system

Dear Questioner: Please see these two papers which also have many references on the same subject.

(1) Wastewater Management Strategy: centralized v. decentralized technologies for small communities 

(2) Decentralized Wastewater Treatment Systems    Kind regards, Prof. Dr. Hilmi S. Salem