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Use of Enhanced Biological Phosphorus Removal for Treating Nutrient-Deficient Wastewater (Paperback, Illustrated Ed)
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Use of Enhanced Biological Phosphorus Removal for Treating Nutrient-Deficient Wastewater (Paperback, Illustrated Ed)
Series: WERF Research Report Series
Expected to ship within 12 - 17 working days
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Anaerobic/aerobic (AnA) and completely aerobic (CA)
laboratory-scale sequencing batch reactors operating on an acetate-
and casamino acids-based synthetic wastewater were used to
investigate the suitability of the AnA process for treating
nutrient?deficient wastewaters in plants that have stringent
effluent nutrient requirements. Of particular interest is the case
where phosphorus (P)-deficient wastewaters with highly variable
influent COD loading are being treated to meet both effluent TSS
and P limits. At a 4 d mean cell residence time, AnA activated
sludge had an approx. 20% lower P requirement than CA activated
sludge. The difference between the end-of-aerobic cycle
polyhydroxyalkanoate and carbohydrate contents of the sludges
indicated that the AnAsludge used more influent carbon than the CA
sludge for synthesis of non-P-containing storage products. The
nitrogen requirements of AnA sludge were similar to those of the CA
sludge. The AnA and CA SBRs were subjected to three different
transient influent COD loading patterns that simulated (#1) daily
COD Loading fluctuations, (#2) low weekend COD loading, and (#3)
extended low COD loading periods. During the Loading Pattern #1
experiment, the average effluent soluble P concentrations for the
AnA and CA SBRs were 0.4 and 1.0 mgP/L respectively, and complete
removal of influent acetate was observed. During the Loading
Pattern #2 experiment, the average effluent soluble P
concentrations for the AnA and CA SBRs were 0.3 and 0.9 mgP/L
respectively, but effluent acetate was detected during the first
high COD loading cycle following the low weekend COD loading
period. During the Loading Pattern #3 experiment, the VSS content
of both reactors dropped sharply, effluent acetate breakthrough
occurred, and effluent P concentrations exceeding 1 mgP/L were
detected in both the AnA and CA SBRs. Based on these findings, the
AnA process has potential as a technologically and economically
superior alternative for wastewater treatment plants treating
P-deficient wastewasters to meet stringent effluent TSS and P
limits. This publication can also be purchased and downloaded via
Pay Per View on Water Intelligence Online - click on the Pay Per
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