摘要
反硝化除磷SBR系统中长期投加Fe^(2+)能够强化系统除磷脱氮效果。Fe^(2+)浓度为3.0mg/L条件下,R_0(空白)、R_1(厌氧初期投加)、R_2(缺氧初期投加)出水硝氮浓度分别为7.05,5.87,6.24 mg/L。缺氧吸磷后磷浓度分别为6.04,1.03,1.15 mg/L;经后曝气进一步好氧除磷后,出水磷浓度分别为1.26,0.08,0.06 mg/L。反硝化除磷系统Fe^(2+)协同除磷药剂利用率较高,R_1和R_2中铁磷摩尔比(投加Fe^(2+)量与除磷增加量)分别为0.34:1和0.35:1,远低于Fe^(2+)化学除磷的最佳铁磷摩尔比(>2:1)。Fe^(2+)停止投加后系统表现出了持续的强化脱氮除磷效果,厌氧初期投加优于缺氧初期。反硝化除磷系统中长期投加Fe^(2+)盐能够改善污泥沉降性能,相对于R_0,R_1和R_2中污泥SVI平均降低了16.23%和18.92%,污泥絮体变得更加密实。协同机制除了化学作用,还存在生物协同作用。
Dosage of ferrous ion could enhance the nitrogen and phosphorus removal performance of the denitrifying phosphorus removal SBR. Under the dosage concentration of 3.0 mg/L, effluent nitrate concentration of R0 （without Fe^2＋ dosing）, Ri（dosing at the beginning of anaerobic phase） and R2（dosing at the beginning of anoxic phase） was 7.05 mg/L, 5.87 mg/L and 6.24 mg/L respectively. Effluent TP concentration after anoxic phase was 6.04 mg/L, 1.03 mg/L and 1.15 rag/L, and then was decreased to 1.26 rag/L, 0.08 mg/L and 0.06 mg/L after the subsequent aerobic phosphorus removal. The chemical utilization of Fe2. efficiency is high, the mole ratio of iron （Fez~ dosage concentration） and phosphate （ increment of phosphorus removed） of R1 and R2 are 0.34 ： 1 and 0.35 ： 1, which are far below the optimal ratio of chemical phosphorus removal（〉2 ： 1 ）. The system demonstrated the sustained nitrogen and phosphorus removal enhancement, and Rj was better than R2. Moreover, the sludge settling performance was also improved. Compared with the R0, SVI of R1 and R2 was decreased by 16.23% and 18.92%, and sludge floes were much denser. The synergistic mechanism consisted of the chemical reaction and also biological synergism.
出处
《环境保护与循环经济》
2017年第5期22-27,共6页
environmental protection and circular economy
基金
中国博士后科学基金资助项目(2015M571426)
关键词
反硝化除磷
硫酸亚铁
强化除磷脱氮
生物协同作用
denitrifying phosphorus removal
ferrous sulfate
enhanced dephosphorus and denitrifieation
biological synergism
