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以贵阳市城市污水为研究对象,采用MBR脱氮除磷工艺进行了140 d的中试试验。试验结果表明,在无外加碳源的情况下,系统对COD、TN、NH4+-N、TP的去除率分别达到91.9%、78%、99.8%、89%,平均出水分别在26.41、11.8、0.27、0.49 mg.L-1;试验结束时对剩余污泥进行了序批式试验,表明系统中DPAOs/PAOs在39.7%左右,DPAOs的富集强化了系统的除磷效果。出水中的SS质量浓度、浊度及大肠杆菌数量分别小于4 mg.L-1、3 NTU、2个,达到城市杂用水的回用标准。定期采用体积分数0.5%的NaClO药洗有效地抑制了膜的污染,保证了产水的稳定性。
Taking urban wastewater in Guiyang City as the research object, a 140-day pilot test was conducted using MBR nitrogen and phosphorus removal process. The results showed that the removal rates of COD, TN, NH4 + -N and TP reached 91.9%, 78%, 99.8% and 89% respectively in the absence of added carbon source and the average effluent was 26.41, 11.8 and 0.27 , 0.49 mg.L-1. At the end of the experiment, the remaining sludge was subjected to sequencing batch test, indicating that the DPAOs / PAOs in the system was about 39.7%. The enrichment of DPAOs enhanced the system’s phosphorus removal efficiency. The effluent SS concentration, turbidity and the number of E. coli were less than 4 mg.L-1, 3 NTU, 2, reaching the city miscellaneous water reuse standards. Regular use of 0.5% volume fraction of NaClO drug wash effectively inhibit the membrane pollution, to ensure the stability of water production.