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Introduction <br /> Let's review: <br /> Wastewater into the facility is termed INFLUENT. <br /> Treated clear water on top of the clarifier leaving the facility is called <br /> EFFLUENT. <br /> Sludge wasted into the digester is called WS (waste sludge). <br /> Clear water removed from the aerobic digesters is called DECANT. <br /> Settled sludge removed from the aerobic digesters is called DIGESTED <br /> SLUDGE. <br /> Treated wastewater discharged from the plant is called SECONDARY <br /> EFFLUENT. <br /> Polished Secondary effluent is called FINAL EFFLUENT. <br /> 7H Technical Services Group Operation &Maintenance Manual <br /> Introduction Page 6 of 26 <br /> 991215 <br />