硫酸亚铁结合电化学絮凝处理中水氨氮与总磷的研究  

Treatment of Ammonia Nitrogen and Total Phosphorus in Reclaimed Water by combining Ferrous Sulfate with Electrochemical Flocculation

作　　者：孟锋 柴易达 张洛红[2] 杨敏鸽[2] 程水林 黄晟 赵颖 MENG Feng;CHAI Yida;ZHANG Luohong;YANG Minge;CHENG Shuilin;HUANG Cheng;ZHAO Ying(Academic Affairs Office,Xi'an Polytechnic University,Xi'an Shaanxi 710600;College of Environmental and Chemical Engineering,Xi'an Polytechnic University,Xi'an Shaanxi 710600,China)

机构地区：[1]西安工程大学教务处,陕西西安710600 [2]西安工程大学环境与化学工程学院,陕西西安710600

出　　处：《环境保护科学》2020年第2期39-43,共5页Environmental Protection Science

基　　金：陕西省重点研发计划项目(2018KW-036);陕西省科技攻关项目(2019GY186);国家级大学生创新训练计划项目(201810709008);西安市科技计划项目(2019217114GXRC007CG008-GXYD7.10)。

摘　　要：文章分别采用硫酸亚铁絮凝法、电化学法以及硫酸亚铁结合电化学法对中水中低浓度氨氮和总磷的处理效果进行了对比。研究了硫酸亚铁投加量、pH、通电时间和电压对氨氮和总磷去除率的影响。结果表明:采用硫酸亚铁絮凝法,硫酸亚铁投加量为6%,pH为6~7,氨氮去除率为95.45%,总磷去除率92.5%;采用电化学絮凝法,通电时间40 min,通电电压20 V,pH为6~7,中水中氨氮去除率为72.73%,总磷去除率为92.5%;硫酸亚铁结合电化学处理中水,通电电压为20 V,通电时间30 min,硫酸亚铁投加量7%时,中水中氨氮去除率99.09%,总磷去除率92.5%。因为氨直接在阳极失去3个电子被氧化成N2,阳极电解时生成的金属阳离子或其水合物与水中的磷酸盐形成沉淀。而硫酸亚铁通过空轨道吸附铵根中氮的孤对电子后被水解生成的含有Fe3+的羟基络合物絮凝沉淀,Fe2+和Fe3+也都可以与PO43-生成难溶性磷酸盐。The treatment effects of low-concentration ammonia nitrogen and total phosphorus were compared with ferrous sulfate flocculation method,electrochemical method,and ferrous sulfate combined with electrochemical method.The effects of the dosage of ferrous sulfate,pH value,the reaction time and applied voltage on the removal rate of ammonia nitrogen and total phosphorus were studied.The experimental results showed:Using ferrous sulfate flocculation method,when the dosage of ferrous sulfate was 6%and pH was 6~7,the removal rates of ammonia nitrogen and total phosphorus were 95.45%and 92.5%respectively.Using electrochemical flocculation method in pH of 6?7,when the reaction time was 40 minutes and the applied voltage was 20 V the removal rates of ammonia nitrogen and total phosphorus were 72.73%and 92.5%respectively.When the 7%ferrous sulfate combined with electrochemical treatment was used with the voltage of 20 V and the reaction time of 30 minutes,the removal rates of ammonia nitrogen and totoal phosphorus could reach 99.09%and 92.5%respectively.Because ammonia loses 3 electrons directly at the anode,then oxidaizing to N2,metal cations or their hydrates formed during anode electrolysis could precipitae with phosphates in water.And the ferrous sulfate adsorbs the lone pair electrons of nitrogen in the ammonium,and form a Fe^3+ -containing hydroxyl complex to flocculate and precipitate with pollutants.Fe^2+and Fe^3+can also form poorly soluble phosphate with PO4^3-.

关 键 词：中水 硫酸亚铁絮凝 电化学絮凝 氨氮 总磷 

分 类 号：X703[环境科学与工程—环境工程]