磁絮凝耦合重金属捕集剂EDTC对酸性络合镍的深度脱除

发布时间：2018-05-12 19:43

本文选题：磁絮凝 + 纳米磁种　；参考：《中国环境科学》2017年02期

【摘要】：采用磁絮凝耦合自制重金属捕集剂EDTC,以柠檬酸镍(CA-Ni)、酒石酸镍(TA-Ni)和焦磷酸镍(SP-Ni)3种模拟酸性络合镍废水为研究对象,对废水中的络合镍进行深度脱除.研究了EDTC投加量、磁种投加量、初始pH值和静沉时间对络合镍去除效果的影响,探讨了磁絮凝耦合EDTC脱除络合镍的机理.结果表明,处理初始浓度为50mg/L的CA-Ni、TA-Ni和SP-Ni时,磁种投加量100mg/L(350r/min,2min),M_(EDTC)/M_(Ni)=10(250r/min,2min),PAM lmg/L(50r/min,3min),静沉5min,无需调节初始pH值,残留Ni浓度小于O.lmg/L.Zeta电位分析显示:PH7时磁种与EDTC和PH=6.5~7.5时磁种与絮体均通过静电引力相互吸引.磁种的加入使得以磁种为核心的磁絮体形成,提高絮体的沉降性能并降低20%的EDTC用量.絮体的粒径和分形维数分析表明:加载磁种可减少微小絮体,增大絮体体积同时使得絮体更加密实.
[Abstract]:Magnetic flocculation coupled with EDTC was used to study three kinds of simulated acidic complex nickel wastewater (CA-NiC), Nickel tartrate (TA-Ni) and Nickel pyrophosphate (SP-NiN). The complex nickel in the wastewater was removed deeply. The effects of EDTC dosage, magnetic seed dosage, initial pH value and settling time on the removal of complex nickel were studied. The mechanism of removing complex nickel by magnetic flocculation coupled EDTC was discussed. The results show that when CA-NiN TA-Ni and SP-Ni are treated with initial concentration of 50mg/L, the amount of magnetic seed added is 100mg / L 350rmin / min / 2min / min respectively. The analysis of residual Ni concentration less than O.lmg/L.Zeta potential shows that the magnetic species and flocs of EDTC and PH=6.5~7.5 attract each other by electrostatic force at 1: PH7. With the addition of magnetic seed, the magnetic floc with magnetic seed as the core is formed, the sedimentation property of the floc is improved and the dosage of EDTC is reduced by 20%. The analysis of the particle size and fractal dimension of the floc shows that the magnetic seed loading can reduce the tiny floc and increase the volume of the floc and make the floc more dense.
【作者单位】：广东工业大学环境科学与工程学院;广东环境保护工程职业学院;广东工业大学资源综合利用与清洁生产省教育厅重点实验室;
【基金】：广东省自然科学基金(2015A030308008) 广东省科技计划项目(2016A040403068) 广东省环保专项(2016A503160066)
【分类号】：X703

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