Clients ask this at almost every site visit. The honest answer is that a sewage treatment plant meeting DAO 2016-08 discharge limits was never designed to produce drinking water, and here is exactly what would have to be added before it could.
Zero sludge is a sales line, not a design. Field notes from a Cebu wastewater engineer on why every biological STP produces sludge, what Extended Aeration really reduces, and the four questions that expose a false claim.
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