胞外聚合物在生物除磷中作用的研究

Roles of extracellular polymer substances in biological dephosphorization

以进水COD与TP之比分别为100∶1和50∶1的两组SBR反应器为研究对象,探讨了胞外聚合物(EPS)在生物除磷中的作用.研究结果表明,EPS中不仅含有以高价阳离子沉淀物或络合物形式存在的无机磷(IP),而且含有以细菌细胞分泌物或代谢产物形式存在的有机磷(OP).两组SBR反应器活性污泥的厌氧释磷过程主要由EPS产生,好氧吸磷过程主要由EPS完成;EPS的除磷量占系统除磷量的60%～62%,细菌细胞的除磷量占系统除磷量的30%～38%.EPS对主体液相中磷的去除主要通过EPS与主体液相之间磷的间接传输途径来完成,说明EPS在生物除磷过程中充当磷储存库的作用.

Roles of extraeellular polymer substances in biological dephosphorization were investigated in two SBR reactors, of which the ratios of influent COD to TP were respectively 100：1 and 50：1. The results showed that EPS contained not only inorganic phosphate （ IP）, in the form of precipitation or complex of high valence cations, but also organic phosphate （OP） as secretion or metabolite of bacteria. In anaerobic stage the phosphorus released were mostly originated from EPS, while in aerobic stage the phosphorus absorbed were mainly stored in EPS. EPS was accounted for 60% -62% of the total phosphate removal, in comparison with 30% - 38% by bacteria phosphorus removal. The course of phosphorus removal in EPS was mainly performed through the indirect phosphorus transmission path between EPS and the liquid, suggesting that EPS was the phosphorus storage of biological floc.