改变缺氧池容积强化A^2/O工艺脱氮除磷效率

采用实验室规模连续流厌氧-缺氧-好氧(A/A/O)工艺处理人工模拟生活污水,考察了不同碳氮比(C/N)和溶解氧(DO)工况下改变缺氧池容积对A^2/O工艺脱氮除磷效果的影响。结果表明,在低C/N和好氧阶段DO含量较低时,增大缺氧池容积有利于提高TN的去除率和除磷效率,在COD/ρ(TN)(ρ(TN)≈40 mg/L)约为7,DO的质量浓度在0.9~1.2 mg/L的条件下,缺氧池容积增加1倍,TN去除率可达71.1%,PO4^3--P去除率可达94.0%;在高C/N和好氧阶段DO含量较高时,增大缺氧池容积在提高TN去除率和改善出水水质方面效果不显著。

Enhanced Nitrogen and Phosphorus Removal Efficiency of A^2/O Process by Changing the Volume of Anoxic Tank

A laboratory-scale continuous flow anaerobic/anoxic/aerobic(A/A/O)process was used to treat artificial domestic sewage.The effect of changing anoxic tank volume on nitrogen and phosphorus removal efficiency of A2/O process under different carbon nitrogen ratio(C/N)and dissolved oxygen(DO)conditions was investigated.The results showed that increasing the volume of anoxic tank was beneficial to the removal efficiency of TN and phosphorus when C/N was low and DO content was low in aerobic phase.Under the condition of COD/ρ(TN)(ρ(TN)≈40 mg/L)was about 7 and mass concentration of DO at 0.9~1.2 mg/L,the volume of the anoxic pool doubled,the TN removal rate could reach 71.1%,and the PO4^3--P removal rate could reach 94.0%.When the C/N was high and the DO content was high in aerobic phase,increasing the anoxic tank volume had no significant effect on TN removal rate and improvement of effluent quality.