COD对生物流化床法降低污泥回流液中氮磷的影响

Effect of COD on the removal of nitrogen and phosphorus in the reduction of concentration of sludge refluxing liquid by biological fluidized bed

以市政污水处理厂污泥回流液为研究对象,研究了不同碳、氮、磷水平条件下生物流化床法脱氮除磷的情况,分析了COD/TN与COD/TP对生物流化床脱氮除磷的影响。结果表明,COD对脱氮影响不大,而对除磷具有较大影响。在COD为500mg/L,进水TN为115mg/L时,TN的去除率最大值为72.05%,此时,COD/TN为4.35。在COD为480mg/L,进水TP为11.25mg/L时的去除率较高为36.98%,此时COD/TP为42.67。生物流化床法对高浓度氮磷污泥回流液具有一定的脱氮除磷效果,TN去除率可达56.35%,TP去除率为28.96%。

The sludge refluxing liquid in the municipal sewage treatment plant has been investigation and the situation that removing nitrogen and phosphorus with biological fluidized bed under different levels of carbon, nitrogen and phosphorus has been studied. The effects of COD/TN and COD/TP on the removal of nitrogen and phosphorus by biological fluidized bed are analyzed. The results show that COD has little effect on the removal of nitrogen, but has better effect on the removal of phosphorus. When COD=500 mg/L and the TN in influent water is 115 mg/L, the removal rate of TN reaches 72.05%. At this time, the COD/TN is 4.35. When COD=480 mg/L and the TP in influent water is 11.25 mg/L, the removal rate is 36.98%. At this time, the COD/TP is 42.67. The biological fluidized bed has certain removal effect on the reduction of sludge refluxing liquid with highly concentrated nitrogen and phosphorus. The removal rate of TN can be as high as 56.35% and the removal rate of TP is 28.96%.