基质种类对活性污泥絮体性状的影响

Effect of carbon substrates on the characteristics of activated sludge flocs

利用葡萄糖、淀粉、乙酸钠和苯酚4种典型基质,分别在4个相同的序批式反应器(Sequencing Batch Reactor,SBR)中培养活性污泥,并研究了基质种类对活性污泥絮体性状的影响.结果表明,以葡萄糖为底物培养的活性污泥胞外多糖含量最少,而苯酚所培养的活性污泥胞外蛋白质最多;从形成的EPS总量来看,苯酚最多,乙酸钠次之,葡萄糖和淀粉较少.不同基质培养的污泥Zeta电位也有一定差别,这是由EPS中多糖和蛋白质的比例不同造成的.红外分析表明,4种基质培养的污泥EPS中的主要基团较为相似,羧基、醇羟基、羧酸、酰胺和多聚糖均是EPS中的主要基团.此外,进水基质对活性污泥絮体的粒度分布及分形结构也有重要影响.

The floc characteristics of activated sludge flocs fed with glucose, starch, acetate and phenol substrates were investigated. The polysaceharide content in the sludge fed with glucose was lower than the others, while the protein content in the sludge fed with phenol was the highest of the group. The total amount of EPS in the sludge fed with phenol was higher than the others. The ratio of polysaccharide to protein was correlated with the surface charge of the sludge flocs. The functional groups of EPS in the sludge flocs fed by the four substrates were similar, including carboxyl, hydroxyl, carboxylic acid, and amide. All four of the carbon substrates had notable effects on the size distribution and fractal structure of the sludge flocs.