环境与市政工程学院

5th IWA-ASPIRE Conference & Exhibition

中文关键字：碳氮比；活性污泥，EPS；表面特性，英文关键字：COD/N ratio; EPS; flocculation, settleability and

Two laboratory-scale sequencing batch reactors (RA and RB) were used to investigate the influences of chemical oxygen demand to nitrogen (COD/N) ratio on the characteristics of nitrifying activated sludge in disposing the high-strength ammonia wastewater, including the nitrification performance, morphology and physicochemical parameters. RA was operated at five different COD/N ratios (0, 2, 4, 6, 10), which was aimed to represent the carbon-rich wastewater. In RB, the COD/N ratios were at relative low level (0, 0.5, 1, 2), which represented a carbon-limited case. The characteristics of the nitrifying sludge flocs were significantly influenced in RA, but relative stable in RB. Throughout the unsteady-state changes, no strong correlation could be found between the extracellular polymeric substances (EPS) contents of the sludge with the COD/N ratio, but the ratio of proteins (PN) to polysaccharides (PS) in the EPS had a negative correlation with the COD/N ratio. There was no obvious relationship between the total amount of EPS and the physicochemical characteristics of the sludge. However, regardless of loosely bound EPS and tightly bound EPS, the PN and the ratio of PN/PS were strongly correlated with the flocculation, settleability, dewaterability and surface properties of the nitrifying activated sludge.

任勇翔

夏志红,梁贤

renyongxiang,yanglei

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2013-09-01