反硝化除磷工艺研究

Study of Denitrifying Dephosphatation Process

研究了反硝化除磷工艺的运行效果。结果表明,此反硝化除磷工艺可以较好地进行除磷脱氮,但是磷的去除对进水氮的浓度有一定的要求。在进水COD 400 mg/L,总磷15 mg/L,氨氮84 mg/L的条件下COD的降低率可达96%以上,氮的去除率稳定在86%-88%,磷的去除率为92%-95%。进水氨氮质量浓度为60 mg/L时,磷的去除率为78%,在进水氨氮质量浓度降为44mg/L时磷的去除率降为68%。反硝化除磷比以氧为电子受体的生物除磷可减少耗氧55.5%,剩余污泥的产生量可减少53%,温室气体CO2的产生量可减少体积分数21.4%。

A denitrifying dephosphatation process was operated in this study. The results showed that the denitrifying dephosphatation process could remove phosphorus and nitrogen successfully at an adequate concentration of nitrogen in inflow. Above 96 % COD was removed when the inflow COD, total phosphorus （TP） and ammonia nitrogen （NH3-N） were 400 mg/ L, 15 mg/L and 84 mg/L respectively, 86%-88% nitrogen and 92%-95% phosphorus was removed simultaneously. But when the inflow NH3-N was 60 mg/L, 78% phosphorus was removed, once the inflow NH3-N dropped to 44 mg/L, only 68% phosphorus was removed in the system. In the system used nitrate as electron acceptor, the oxygen consumption was 55. 5% less than the system that oxygen was used as electron acceptor. The sludge and CO2 production was 53% and 21.4% less, respectively.