三维电极法处理低浓度氨氮废水的研究

养殖场污水处理系统厌氧/好氧阶段的出水,氨氮浓度较低、较难生物降解。针对此类废水中的特征污染物氨氮,研究通过单因素实验和响应面设计实验得到三维电极最优电解条件,即pH值5.0,电解质浓度0.20 mol/L,电压9.86 V,极板间距6.47 cm。在最优条件下处理氨氮浓度为140.00 mg/L的原水,出水氨氮浓度降至34.50 mg/L,低于《鄱阳湖生态经济区水污染物排放标准》(DB36/852-2015)中高效集约发展区氨氮限值。运用X射线衍射仪检测到,在烧结温度为200℃时,活性炭表面附着了α-MnO2、β-MnO2和Mn3O4。结合电化学反应特性,分析所构建的三维电极体系的反应机理。

An Experimental Study of Three-dimensional Electrode to Treat Low Concentration Ammonia Nitrogen Wastewater

The effluent from the anaerobic/aerobic stage of the sewage treatment system has a low ammonia nitrogen concentration and it is difficult to biodegrade.Aming at this characteristic pollutant from this type of wastewater the study is obtained through single factor experiment and response surface design experiment.The optimal reaction parameters of the three-dimensional electrode are as follows:the waste water initial pH is 5.0;the voltage is 9.86 V;the plate spacing is 6.47 cm;the electrolyte concentration is 0.20 mol/L.The final effluent ammonia nitrogen concentration from 140.0 to 34.5 mg/L when it comes to treat the raw water by these parameters.It is lower than the Wastewater Discharge Standard of Poyang Lake Eco-economic District in Jiangxi Province(DB36/852-2015).X-ray diffraction method is used to detect that when the sintering temperature is 200℃,the surface of activated carbon is loaded withα-MnO2,β-MnO2 andMn3O4.Then the reaction mechanism of three-dimensional electrode system is analyzed by electrochemical reaction characteristics.