BER-BCO耦合工艺净化模拟微污染河水及除磷机理研究

Study of BER-BCO Coupled Process for Purifying Simulated Micro-polluted River Water and Phosphorus Removal Mechanism

针对传统生物膜法对微污染河水脱氮除磷效率不佳的问题,设计了电极生物膜耦合生物接触氧化(BER-BCO)装置,采用单因素敏感性分析方法评估了不同碳源、电流密度、水力停留时间、填料填充比对工艺脱氮除磷效果的影响,并通过红外光谱表征阳极附近沉淀物表面特征官能团,探究系统除磷机理。结果表明,在使用乙酸钠为碳源、电流密度为0.09 mA/cm^(2)、水力停留时间控制为24 h、填料比为40%的条件下,BER-BCO系统的脱氮除磷效能得到了显著优化;NH+4-N、TN、TP的去除率分别达到了83.10%、56.46%、97.93%;最终出水除TN外均优于《地表水环境质量标准》(GB 3838-2002)中Ⅳ类水质标准;红外光谱分析显示阳极附近形成的含磷沉淀物中含有Fe-O键、P-O键、Fe-OH键,表明铁阳极具有高效除磷的特性。

In response to the poor efficiency of traditional biofilm methods in nitrogen and phosphorus removal from slightly polluted river water,an electrode biofilm coupled biological contact oxidation(BER-BCO)device was designed.The single factor sensitivity analysis method was used to evaluate the effects of different carbon sources,current density,hydraulic retention time,and filler filling ratio on the process's nitrogen and phosphorus removal efficiency.The charac-teristic functional groups on the surface of sediment near the anode were characterized by infrared spectroscopy.The mechanism of systematic phosphorus removal was explored.The results show that the nitrogen and phosphorus removal efficiency of the BER-BCO system was significantly optimized under the conditions of using sodium acetate as the carbon source,current density of 0.09 mA/cm^(2),hydraulic retention time control of 24 hours,and filler ratio of 40%.The re-moval rates of NH+4-N,TN,and TP reached 83.10%,56.46%,and 97.93%,respectively.The final effluent,except for TN,is superior to the ClassⅣwater quality standard in GB 3838-2002"Surface Water Environmental Quality Stand-ard".Infrared spectrum analysis shows that the phosphorus containing precipitate formed near the anode contains Fe-O bonds,P-O bonds,and Fe-OH bonds,indicating that the iron anode has the characteristic of efficient phosphorus removal.