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No Sewage Treatment Plant Is Zero-Sludge. Here Is Where the Sludge Actually Goes.
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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No Sewage Treatment Plant Is Zero-Sludge. Here Is Where the Sludge Actually Goes.