Field notes from an early food processing plant project: emulsified FOG I underestimated, a combined waste stream that tightened my own compliance target, a second-floor plant that took odour complaints from the Barangay to the DOH, and the flotation and fixed-film retrofit that finally held.
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.
