污泥龄对污泥絮体中磷酸盐形态及其动态变化的影响

以污泥龄(SRT)为10 d和30 d的2组A/O-SBR反应器活性污泥为研究对象,探讨了SRT对污泥絮体中磷酸盐形态及其动态变化的影响。结果表明,污泥絮体中的磷主要分布于胞外聚合物(EPS),EPS磷占污泥絮体磷总质量的69.45%~73.36%。正磷酸盐(PO3-4-P)、低分子量聚磷酸盐(LMW Poly-P)和高分子量聚磷酸盐(HMW Poly-P)是污泥絮体磷的主要形态。高SRT(30 d)污泥絮体EPS磷含量明显大于中SRT(10 d),表现为前者较后者有更高的PO3-4-P和HMW Poly-P含量,对应着高SRT(30 d)污泥絮体较中SRT(10 d)有更高的磷含量,前者约为后者的1.37倍。厌氧/好氧反应过程中,中SRT(10 d)污泥絮体EPS磷的厌氧降低量和好氧升高量分别为高SRT(30 d)的1.35倍和1.46倍,主要归因于前者的PO3-4-P和HMW Poly-P较后者有更大的厌氧降低量,而PO3-4-P,LMW Poly-P和HMW Poly-P较后者有更大的好氧升高量,对应着中SRT(10 d)污泥絮体较高SRT(30 d)有更强的厌氧释磷和好氧吸磷能力。

Effect of SRT on Species and Dynamic Change of Phosphates in Sludge Floc

By adopting the activated sludge from two A/O-SBR reactors,of which the SRT are respectively 10 d and 30 d, effect of SRT on species and dynamic change of phosphates in sludge floc is investigated. The results show that phosphorus of sludge floc are mainly located in extracellular polymer substances （EPS） and the phosphorus contents of EPS are 69.45% to 73.36%of the total phosphorus contents of the sludge. Orthophosphate（PO3-4 -P）and polyphosphate（Poly-P）including low molec-ular weight polyphosphate（LMW Poly-P）and high molecular weight polyphosphate（HMW Poly-P）are the main species of sludge floc phosphorus. The phosphorus contents in high SRT（30 d）sludge EPS are much more than that in middle SRT（10 d）sludge EPS,which manifests that the former has more PO3-4 -P and HMW Poly-P contents than the latter,so the high SRT（30 d）sludge floc is related to the high phosphorus contents,and the phosphorus contents in the former are 1.37 times than those in the latter. Moreover,the decreased amount in anaerobic phase and increased amount in aerobic phase of middle SRT（10 d）sludge EPS phos- phorus are repectively 1.35 and 1.46 times than those of high SRT（30 d）sludge EPS phosphorus,which is mainly due to the fact that the PO3-4 -P and HMW Poly-P have more decreased amount in anaerobic phase and PO3-4 -P,LMW Poly-P and HMW Poly-P have more increased amount in aerobic phase of the former than those of the latter,so the middle SRT（10 d）sludge floc is related to the stronger anaerobic phosphorus release and aerobic phosphorus uptake capacities than the high SRT（30 d）sludge floc.