基于MBR脱氮除磷与污水回用中试研究

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。

PILOT STUDY OF BIOLOGICAL NITROGEN AND PHOSPHORUS REMOVAL AND WASTEWATER RECLAMATION BASED ON MBR

Pilot-scale nutrient-removal membrane bioreactor was used to treat wastewater for 140 days.The test results showed that,in the absence of external carbon source,91.9%,78%,99.8%,89% removal efficiency of COD,TN,NH4+-N,TP,respectively could be obtained,with the average effluent of 26.41、11.8、0.27、0.49 mg·L-1 in the system.At the end of the trial,sequencing batch test was performed using the discharged sludge,indicating that DPAOs/PAOs was about 39.7% and enrichment of DPAOs enhanced phosphorus removal.SS,turbidity and E.coli of the effluent were less than 4 mg·L-1,3 NTU,2 L-1 separately and reached urban sewage reuse standards.Washing the membrane with 0.5% NaClO regularly inhibited the membrane fouling effectively and ensure the stability of water production.