铁碳微电解去除水中硝酸盐影响因素的研究
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摘要
利用混合海绵铁与活性炭形成微电解,用于去除人工模拟废水中硝酸盐氮并探究其影响因素。通过海绵铁-活性炭混合、海绵铁及活性炭对硝酸盐吸附还原过程探讨其微电解作用机理,考察铁碳比、进水浓度、初始pH、预处理对硝酸盐去除率的影响。结果表明,铁碳混合后形成微电解能有效提高硝酸盐去除率,反应4 h去除率可达80%;对海绵铁进行表面酸预处理能使硝酸盐去除效果提高43%;正常的pH(6～8)对工艺的影响不大;硝酸盐浓度越高反应速率越慢,反应符合准一级动力学方程。
Mixed sponge iron and activated carbon are used in experiments to form micro-electrolysis,which is used to remove nitrates in artificial simulated wastewater and explore the influencing factors.The effects of micro-electrolysis on the adsorption and reduction of nitrates are explored by comparing sponge iron-activated carbon mixture,sponge iron alone and activated carbon alone.The influences of conditions( iron-carbon ratio,influent concentration,initial p H value and pretreatment) on nitrates removal are compared.It is shown that the formation of micro-electrolysis after mixing iron and carbon can effectively improve the removal rate of nitrates,which can reach 80% after 4 hours of reaction. Surface acid pretreatment to sponge iron can increase the removal rate by 43%.The normal p H value( 6-8) has little effect on the process.The higher the nitrates concentration,the slower the reaction rate. The reaction conforms to the quasi-firstorder kinetic equation.
Mixed sponge iron and activated carbon are used in experiments to form micro-electrolysis,which is used to remove nitrates in artificial simulated wastewater and explore the influencing factors.The effects of micro-electrolysis on the adsorption and reduction of nitrates are explored by comparing sponge iron-activated carbon mixture,sponge iron alone and activated carbon alone.The influences of conditions( iron-carbon ratio,influent concentration,initial p H value and pretreatment) on nitrates removal are compared.It is shown that the formation of micro-electrolysis after mixing iron and carbon can effectively improve the removal rate of nitrates,which can reach 80% after 4 hours of reaction. Surface acid pretreatment to sponge iron can increase the removal rate by 43%.The normal p H value( 6-8) has little effect on the process.The higher the nitrates concentration,the slower the reaction rate. The reaction conforms to the quasi-firstorder kinetic equation.
引文
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[20]郭俊,胡晓东,石云峰,等.铁碳微电解-Fenton氧化预处理头孢菌素废水应用性研究[J].水处理技术,2015,(2):113-116.
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[24]吕雷,朱米家,魏彦林,等.铁碳微电解响应面优化预处理染料废水[J].环境工程学报,2015,9(6):2911-2917.
[25]高阳阳,刘国,陈西亮,等.生物表面活性剂改性对纳米铁/炭去除地下水中NO3--N的影响[J].环境科学学报,2016,36(9):3258-3265.
[2]陈欢,张亚平,阮晓红.Fe2+在零价铁还原去除NO3-中的作用效应[J].高校地质学报,2018,24(1):109-115.
[3]马丹丹,文晨,季民.微电解-铁碳内电解耦合预处理高浓度染料废水[J].化工进展,2013,32(1):205-208.
[4]俸志荣,焦纬洲,刘有智,等.铁碳微电解处理含硝基苯废水[J].化工学报,2015,66(3):1150-1155.
[5]周贵忠,王绚,刘建庭,等.多孔铁-碳-稀土合金填料对高盐废水中氯离子的去除[J].环境工程学报,2013,7(6):2167-2172.
[6]刘艳,白鸽,谷传峰,等.超声条件下海绵铁降解活性蓝194的研究[J].山东化工,2017,(17):175-177.
[7]黄蒸,邓东阳,李辉,等.改性海绵铁降解四溴双酚A的特性及机理[J].环境化学,2017,36(5):1083-1089.
[8]Li J,Wei L,Li Y,et al. Cadmium removal from wastewater by sponge iron sphere prepared by hydrogen reduction[J]. Journal of Environmental Sciences,2011,23 Suppl(Suppl 1):S114.
[9]于军,秦霄鹏,高磊,等.内电解技术处理有机废水的应用进展[J].中国给水排水,2009,25(12):12-15.
[10]李婷,朱易春,康旭,等.海绵铁还原微污染源水中硝酸盐氮的影响因素研究[J].工业水处理,2016,36(11):85-89.
[11]Lee J Y,Sun Y Y,Choi S I,et al.Removal of mixed contaminants by Fe0-based biobarrier in flow-through columns using recycled waste materials[J]. Journal of Material Cycles&Waste Management,2009,11(3):214-221.
[12]郝志伟,李亮,马鲁铭.零价铁还原法脱除地下水中硝酸盐的研究[J].中国给水排水,2008,24(17):36-39.
[13]陈西亮,刘国,高阳阳,等.零价纳米铁炭微电解体系去除水中硝酸盐[J].环境化学,2016,35(8):1670-1675.
[14]黄园英,秦臻,刘丹丹,等.纳米铁还原脱氮动力学及其影响因素[J].岩矿测试,2011,30(1):53-58.
[15]高洪岩,孟凡生,王业耀.海绵状零价铁修复硝酸盐污染地下水试验研究[J].环境科学与管理,2014,39(8):77-81.
[16]王晨璐,龚本涛,沈峥,等.铁炭微电解法去除青霉素类抗生素的研究[J].现代化工,2018,38(9):100-104.
[17]郑雯婧,林建伟,詹艳慧,等.锆-十六烷基三甲基氯化铵改性活性炭对水中硝酸盐和磷酸盐的吸附特性[J].环境科学,2015,(6):2185-2194.
[18]刘国,许小芳,李知可,等.纳米铁炭微电解去除水中硝酸盐途径及其动力学[J].环境工程学报,2018,12(4):1033-1045.
[19]王慧超,袁林江,玉亚,等.实验室有机废水的铁碳微电解预处理[J].环境工程学报,2016,10(7):3591-3596.
[20]郭俊,胡晓东,石云峰,等.铁碳微电解-Fenton氧化预处理头孢菌素废水应用性研究[J].水处理技术,2015,(2):113-116.
[21]Zhang Z,Han Y,Xu C,et al. Microbial nitrate removal in biologically enhanced treated coal gasification wastewater of low COD to nitrate ratio by coupling biological denitrification with iron and carbon micro-electrolysis[J]. Bioresource Technology,2018,262:65-73.
[22]Khalil A M E,Eljamal O,Amen T W M,et al.Optimized nano-scale zero-valent iron supported on treated activated carbon for enhanced nitrate and phosphate removal from water[J].Chemical Engineering Journal,2017,309:349-365.
[23]Jiang Z,Lv L,Zhang W,et al. Nitrate reduction using nanosized zero-valent iron supported by polystyrene resins:Role of surface functional groups[J].Water Research,2011,45(6):2191-2198.
[24]吕雷,朱米家,魏彦林,等.铁碳微电解响应面优化预处理染料废水[J].环境工程学报,2015,9(6):2911-2917.
[25]高阳阳,刘国,陈西亮,等.生物表面活性剂改性对纳米铁/炭去除地下水中NO3--N的影响[J].环境科学学报,2016,36(9):3258-3265.