破络-Fenton法处理化学镀镍废水并回收水中的磷酸盐
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摘要
以电镀厂化学镀镍的混合清洗水为处理对象,采用CaO破络吸附联合Fenton氧化的多级物化技术去除废液中的镍离子和磷酸盐,研究CaO投加量和反应时间对镍离子去除效率的影响以及Fenton试剂投加量、反应初始pH对废液中磷处理效果的影响。结果表明,通过两段式反应,当CaO投加量为2 g·L~(-1)、反应时间1 h;反应初始pH为4、H_2O_2投加量9.18 mg·L~(-1)、m(H_2O_2)/m(Fe~(2+))为5∶1、反应时间180 min时,镍离子和总磷(TP)含量由原来的64.6和90.2 mg·L~(-1)分别降低至0.43和0.46 mgl·L~(-1),均达到国家《污水综合排放标准》(GB 8978-1996)。处理后沉淀物经测试符合Fe_2(PO_4)_3晶体及其形貌特征,达到了资源回收的目的。
Electroless nickel plating wastewater was treated by calcium oxide precipitation and Fenton oxidation in order to remove Ni~(2+) and phosphate. The effect of CaO dosage and precipitation time on the removal efficiency of Ni~(2+) were studied,and the effects of Fenton dosage and pH on phosphate removal were also investigated. The results showed that Ni~(2+) and TP in wastewater decreased from 64. 6 and 90. 2 mg·L~(-1)to 0. 43 and 0. 46 mg·L~(-1),respectively,by combining the CaO precipitation and Fenton oxidation process. The optimal CaO dosage and reaction time were 2 g·L~(-1)and 1 h for precipitation and the optimal H_2O_2 dosage and m( H_2O_2)/m( Fe~(2+))were 9. 18 mg·L~(-1)and 5 ∶ 1( mass ratio),respectively. The treated effluent meets the criteria of the Integrated Wastewater Discharge Standard( GB 8978-1996) of China. Moreover,the sediment formed after the Fenton reaction was characterized and determined to be Fe_2(PO_4)_3,which would realize the goal of resource reutilization.
Electroless nickel plating wastewater was treated by calcium oxide precipitation and Fenton oxidation in order to remove Ni~(2+) and phosphate. The effect of CaO dosage and precipitation time on the removal efficiency of Ni~(2+) were studied,and the effects of Fenton dosage and pH on phosphate removal were also investigated. The results showed that Ni~(2+) and TP in wastewater decreased from 64. 6 and 90. 2 mg·L~(-1)to 0. 43 and 0. 46 mg·L~(-1),respectively,by combining the CaO precipitation and Fenton oxidation process. The optimal CaO dosage and reaction time were 2 g·L~(-1)and 1 h for precipitation and the optimal H_2O_2 dosage and m( H_2O_2)/m( Fe~(2+))were 9. 18 mg·L~(-1)and 5 ∶ 1( mass ratio),respectively. The treated effluent meets the criteria of the Integrated Wastewater Discharge Standard( GB 8978-1996) of China. Moreover,the sediment formed after the Fenton reaction was characterized and determined to be Fe_2(PO_4)_3,which would realize the goal of resource reutilization.
引文
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[13]LIU Peng,LI Chaolin,LIANG Xingang,et al.Recovery of high purity ferric phosphate from a spent electroless nickel plating bath[J].Green Chemistry,2014,16(3):1217-1224
[14]HAJI S,BENSTAALI B,AL-BASTAKI N.Degradation of methyl orange by UV/H2O2advanced oxidation process[J].Chemical Engineering Journal,2011,168(1):134-139
[15]刘鹏.紫外催化氧化处理高浓度难降解化学镀废液研究[D].哈尔滨:哈尔滨工业大学,2014
[16]JIRAROJ D,UNOB F,HAGeGE A.Degradation of Pb-EDTA complex by a H2O2/UV process[J].Water Research,2006,40(1):107-112
[17]ABRAMOVIC'B F,BANIC'N D,SOJIC'D V.Degradation of thiacloprid in aqueous solution by UV and UV/H2O2treatments[J].Chemosphere,2010,81(1):114-119
[2]BAUDRAND D,BENGSTON J.Electroless plating processes:Developing technologies for electroless nickel,palladium,and gold[J].Metal Finishing,1995,93(9):55-57
[3]LI C L,ZHAO H X,TSURU T,et al.Recovery of spent electroless nickel plating bath by electrodialysis[J].Journal of Membrane Science,1999,157(2):241-249
[4]HUNG C,HUANG Y H,CHEN C Y.Heterogeneous catalytic oxidation of hypophosphite by H2O2:p H effect[J].Water Science&Technology,2007,55(12):89-93
[5]戴文灿,周发庭.电镀含镍废水治理技术研究现状及展望[J].工业水处理,2015,35(7):14-18
[6]施银燕,徐玉福,胡献国.化学沉淀法回收化学镀镍废水中镍的研究[J].电镀与环保,2011,31(5):44-46
[7]于泊蕖,吕树芳,赵建海.氢氧化镁处理含镍废水条件探索及机理研究[J].工业安全与环保,2011,37(1):10-11
[8]李姣,杨春平,陈宏,等.破络合剂对化学镀镍废水处理的影响[J].环境工程学报,2011,5(8):1713-1717
[9]BURKITT M J,GILBERT B C.Model studies of the iron-catalysed haber-weiss cycle and the ascorbate-driven fenton reaction[J].Free Radical Research Communications,1990,10(4/5):265-280
[10]雷乐成,汪大翚.水处理高级氧化技术[M].北京:化学工业出版社,2001:20
[11]陈黄浦,宗瑜瑾.配位离子在化学镀镍中的动态演变和作用[J].西安交通大学学报,2000,34(10):57-61
[12]EVANGELOU V P.Potential microencapsulation of pyrite by artificial inducement of ferric phosphate coatings[J].Journal of Environmental Quality,1995,24(3):535-542
[13]LIU Peng,LI Chaolin,LIANG Xingang,et al.Recovery of high purity ferric phosphate from a spent electroless nickel plating bath[J].Green Chemistry,2014,16(3):1217-1224
[14]HAJI S,BENSTAALI B,AL-BASTAKI N.Degradation of methyl orange by UV/H2O2advanced oxidation process[J].Chemical Engineering Journal,2011,168(1):134-139
[15]刘鹏.紫外催化氧化处理高浓度难降解化学镀废液研究[D].哈尔滨:哈尔滨工业大学,2014
[16]JIRAROJ D,UNOB F,HAGeGE A.Degradation of Pb-EDTA complex by a H2O2/UV process[J].Water Research,2006,40(1):107-112
[17]ABRAMOVIC'B F,BANIC'N D,SOJIC'D V.Degradation of thiacloprid in aqueous solution by UV and UV/H2O2treatments[J].Chemosphere,2010,81(1):114-119
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