【摘要】 研究证明,将催化铁添加至传统生物除磷工艺的厌氧段,可使得生物除磷和化学除磷两者作用耦合。为了研究工艺中生物除磷与化学除磷的关系,采用不同催化铁投配率分别为0、1和2 g Fe/(mg P·d)的3组反应器进行实验。结果表明,催化铁投配率为1 g Fe/(mg P·d)时,系统的除磷效率最佳,去除率在90%以上,生物除磷与化学除磷耦合作用好;负荷为2 g Fe/(mg P·d)时,系统在未达到稳定之前即发生恶化,生物除磷作用受到抑制。铁化合物的积累量过多是系统出现恶化的主要原因:在污泥中铁含量小于30 mg Fe/g MLSS时,生物除磷作用与化学除磷作用两者协同,除磷效率提高;当污泥中铁含量超过52.8 mg Fe/g MLSS时,出现竞争,生物除磷作用受到抑制;通过排泥,降低污泥中铁含量,则除磷功能可以得到恢复。更多还原

【Abstract】 It is proved that the coupled process of catalyzed iron method and biological treatment which is used to enhance the phosphorus removal is reasonable and feasible. By packing catalyzed iron into the anaerobic tank of A / O process,phosphorus can be removed by the coupling of biological and chemical processes. To study the relationship between the biological action and the chemical action in the process,0,1,2 g Fe /( mg P·d)ratio with 15 mg / L P and 0,30,60 g / L of catalyzed iron were discussed in 3 anaerobic / aerobic sequenced batch reactors. The results showed that 1 g Fe /( mg P·d) was the optimum ratio with the average phosphorus removal efficiency above 90%,the biological action and chemical action coupled effectively; when the ratio was2 g Fe /( mg P·d),it would be destroyed before the coupled system reached its balance,the biological phosphorus removal was inhibited. Excessive accumulation of iron compounds was the main reason. When the content of total Fe was less than 30 mg Fe / g MLSS,the phosphorus removal efficiency was improved by coupling of biological and chemical actions; when over 52. 8 mg P / g Fe,PAOs( polyphosphate-accumulating microorganisms)began to compete with iron compound for the PO3-4,and the action of biological phosphorus removal was inhibited. By reducing the content of iron compounds in the system,the function of phosphorus removal could be recovered.更多还原