Abstract
The characteristics of the P removal sludge were studied in 3 different operation modes (AO, AOA and A2O mode) of the sequencing batch membrane reactor (SBMBRs). The results showed that the sludge P content was positively correlated with the P removal ability. The relative P content of the saturated P uptake sludge was 30.6%, 36.7% and 42.9%, respectively in the 3 modes. PHB was synthesized in anaerobic activated sludge and the polyp-P granules were decreased. The opposite trend appeared in aerobic condition. The amount of PHB change in anaerobic stage was proportional to the P release capacity. The FISH detection showed that the more proportion of PAOs to the whole cell the more P removal ability in the system.
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