低碳源污水的强化反硝化除磷研究

Study on Enhanced Denitrifying Phosphorus Removal from Domestic Sewage with Low Carbon Source

针对低碳源生活污水(COD/TN值<5,COD<200 mg/L)脱氮除磷效果差的问题,设计并运行了一套具有强化反硝化除磷功能的反应器。该反应器结合污泥外循环侧流除磷、剩余污泥碱解技术,并强化反硝化吸磷功能,采用好氧/缺氧交替运行方式。结果表明:在进水COD、TN、NH3-N、TP平均浓度分别为151、31.37、24.80、5.72 mg/L,C/N、C/P平均值分别为4.81、26.99的情况下,系统具有稳定的脱氮除磷效果,出水COD、TN、NH3-N、TP平均浓度分别为20.63、13.25、0.68和0.10 mg/L,平均去除率分别为86.31%、57.80%、97.26%和98.18%。

To address the poor performance of nitrogen and phosphorus removal from domestic sew- age with low carbon source （COD/TN 〈 5 and COD 〈 200 mg/L） , a reactor which combines external sludge recycle for side-stream phosphorus removal, alkaline decomposition of excess sludge and enhanced denitrifying phosphorus removal was developed. The reactor was operated in alternating aerobic and anox- ic modes. The results showed that the system achieved stable nitrogen and phosphorus removal efficiency when the influent COD, TN, NH3 -N, TP, C/N and C/P were 151 mg/L, 31.37 mg/L, 24.80 mg/L, 5.72 mg/L, 4.81 and 26.99, respectively. The avemge concentrations of COD, TN, NH3 - N and TP in the effluent were 20.63 mg/L, 13.25 mg/L, 0.68 mg/L and 0.10 mg/L, respectively. The avemge removal rates were 86.31% , 57.80% , 97.26% and 98.18% , respectively.