催化铁与生物法耦合除磷工艺特性

为了研究催化铁与生物耦合后对生物除磷特性的影响，实验采用人工配水用厌氧／好氧间歇流式富集培养聚磷微生物。对比发现，催化铁与生物耦合组中厌氧末段ORP降低了约60mV，pH值小幅度的上升（≤0．3），整个培养过程中铁离子的浓度开始快速增加，之后趋于稳定（约40mgFe／gMLSS）。对好氧末段污泥SVI值比较发现，耦合工艺污泥沉降性能得到改善。除磷曲线比较发现，耦合组中厌氧末段磷的释放量下降，而好氧阶段磷的吸收速率增加；胞内聚合物提取表明，耦合组厌氧末段聚磷菌细胞内PHA含量有提高，好氧末段糖原含量有下降。磷形态提取分析表明，耦合组好氧末段污泥中无机态PO3 4-- P含量更高。低浓度铁离子可以起到与生物耦合同步除磷的目的，本工艺长期运行未发现耦合体系中催化铁对除磷的抑制作用。

Characters of coupled phosphorus removal process of catalyzed iron method and biological treatment

In order to research the influence of catalyzed iron on phosphorus removal feature in coupled process of catalyzed iron method and biological treatment, this experiment enriched and cultivated phosphorus ac- cumulating organisms supplied with synthetic wastewater in anaerobic/aerobic sequenced process. It was discov- ered through comparison that ORP at anaerobic end-phase dropped by about 60 mV and pH raised slightly （ ≤0. 3） in coupled process. In overall cultivated course ferric ion concentration increased rapidly in early days and went to a steady value lately （about 40 mg Fe/g MLSS）. The comparison between sludge SVI at aerobic end- phase shows that coupled process improved the sludge settlement performance. The release amount of phosphorus at anaerobic end-phase declined and the uptake rate at aerobic phase ascended in coupled process through com- paring the curve of phosphorus removal. The extraction of inner cellular polymeric substances shows that coupled process increased the PHA content at anaerobic end-phase but reduced the glycogen content at anaerobic end- phase in sludge. Analysis of different phosphorus form demonstrates that the inorganic orthophosphate content in coupled process is higher. The purpose of simultaneous phosphorus removal was obtained in low concentration ferric ion coupled with biological treatment. The exhibition effect of catalyzed iron on biological phosphorus re- moval was not discovered during long-time run of this coupled process.