Ca~(2+)强化沉淀处理含铜电镀废水并回收铜研究
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摘要
针对氢氧化物沉淀工艺不能去除络合态重金属的问题,采用加钙离子强化氢氧化物沉淀的方法处理含铜电镀废水并回收铜实验。结果表明,钙离子的加入能够有效提高氢氧化物对络合态重金属废水的处理效果。当pH> 10,反应时间为15 min,除铜效果为佳,铜去除率可达99%以上。与现有铁氧体法相比,钙强化氢氧化物沉淀法投药量大大减少,工艺稳定性也大大增加。把沉泥加入pH<5的酸液中,铜离子可实现循环利用,为保证重金属回收率,其反应时间应大于30 min。该方法具有工艺简单、成本低廉、效果明显和易于管理的特点。
Aiming to solve the low efficiency of hydroxide precipitation for chelated metals removal, Ca~(2+)-enhanced hydroxide precipitation method was used for electroplating wastewater treatment and copper recovery. The results showed that, the removal efficiency of chelated metals could be effectively promoted by the addition of Ca~(2+). When pH was large than 10 and the reaction time was above 15 min, copper removal efficiency was the best and the copper removal rate could each over 99%. Compared with the present ferrite process, Ca~(2+)-enhanced hydroxide precipitation process has the advantages of low dosage and strong technical stability. By acid dissolution of the resulted sludge, copper could be effectively recovered as pH was less than 5 and reaction time was above 30 min. The new process has the characteristics of simple process, low cost, obvious effect and easy management.
Aiming to solve the low efficiency of hydroxide precipitation for chelated metals removal, Ca~(2+)-enhanced hydroxide precipitation method was used for electroplating wastewater treatment and copper recovery. The results showed that, the removal efficiency of chelated metals could be effectively promoted by the addition of Ca~(2+). When pH was large than 10 and the reaction time was above 15 min, copper removal efficiency was the best and the copper removal rate could each over 99%. Compared with the present ferrite process, Ca~(2+)-enhanced hydroxide precipitation process has the advantages of low dosage and strong technical stability. By acid dissolution of the resulted sludge, copper could be effectively recovered as pH was less than 5 and reaction time was above 30 min. The new process has the characteristics of simple process, low cost, obvious effect and easy management.
引文
[1]姜晓锋,张晓临,朱佳,等.平板陶瓷膜和中空纤维膜处理重金属废水效能对比[J].水处理技术,2017(3):82-86.
[2]GUIMAR?ES A S,MANSUR M B,Selection of a synergistic solvent extraction system to remove calcium and magnesium from concentrated nickel sulfate solutions[J].Hydrometallurgy,2018,175:250-256.
[3]吴亚琪,徐畅,赵越,等.硅酸钙-壳聚糖聚合物制备及其对重金属废水的吸附特性[J].环境化学,2016,35(3):562-567.
[4]SHAKYA A K,RAJPUT P,GHOSH P K.Investigation on stability and leaching characteristics of mixtures of bioge nic arsenosulphides and iron sulphides formed under reduced conditions[J].J Hazard Mater,2018,353:320-328.
[5]赵越,郑欣,徐畅,等.改性硅酸钙(CSH)对重金属废水中Ni2+的吸附特性研究[J].安全与环境学报,2017,17(5):1904-1908.
[6]杨勇,张莉,陈华君,等.冶炼厂重金属废水处理工艺改造及运行实践[J].水处理技术,2017,43(12):135-138.
[7]康丽,刘文,刘晓娜,等.铌酸盐改性钛酸纳米片对水中Cd(II)的吸附行为及机制[J].环境科学,2018,39(7):3212-3221.
[8]陈怡,肖迎旭,樊志金,等.水泥-石灰对Cu2+、Pb2+废水处理研究[J].环境科学与技术,2016(2):139-142.
[9]YE M,LI G,YAN P,et al.Removal of metals from lead-zinc mine tailings using bioleaching and followed by sulfide precipitation[J].Chemosphere,2017,185):1189-1196.
[10]王刚,管映兵,常青,等.聚乙烯亚胺基黄原酸钠处理重金属废水实验研究[J].水处理技术,2018,44(2):76-79.
[11]CECHINEL M A P,MAYER D A,POZDNIAKOVAT A,et al.Removal of metal ions from a petrochemical wastewater using brown macro-algae as natural cation-exchangers[J].Chem Eng J,2016,286:1-15.
[12]IDASZKIN Y L,CAROL E,MARIA D P A.Mechanism of removal and retention of heavy metals from the acid mine drainage to coastal wetland in the Patagonian marsh[J].Chemosphere,2017,183:361-370.
[13]陈雅琼,于春波.高分子型重金属去除剂处理含铜废水[J].水处理技术,2016,42(3):99-102.
[14]GRANT-PREECE P,SCHMIDTKE L M,BARRI C,et al.Photoproduction of glyoxylic acid in model wine:Impact of sulfur dioxide,caffeic acid,p H and temperature[J].Food Chem,2017,215:292-300.
[15]铜、镍、钴工业污染物排放标准:GB 25467-2010[S].
[2]GUIMAR?ES A S,MANSUR M B,Selection of a synergistic solvent extraction system to remove calcium and magnesium from concentrated nickel sulfate solutions[J].Hydrometallurgy,2018,175:250-256.
[3]吴亚琪,徐畅,赵越,等.硅酸钙-壳聚糖聚合物制备及其对重金属废水的吸附特性[J].环境化学,2016,35(3):562-567.
[4]SHAKYA A K,RAJPUT P,GHOSH P K.Investigation on stability and leaching characteristics of mixtures of bioge nic arsenosulphides and iron sulphides formed under reduced conditions[J].J Hazard Mater,2018,353:320-328.
[5]赵越,郑欣,徐畅,等.改性硅酸钙(CSH)对重金属废水中Ni2+的吸附特性研究[J].安全与环境学报,2017,17(5):1904-1908.
[6]杨勇,张莉,陈华君,等.冶炼厂重金属废水处理工艺改造及运行实践[J].水处理技术,2017,43(12):135-138.
[7]康丽,刘文,刘晓娜,等.铌酸盐改性钛酸纳米片对水中Cd(II)的吸附行为及机制[J].环境科学,2018,39(7):3212-3221.
[8]陈怡,肖迎旭,樊志金,等.水泥-石灰对Cu2+、Pb2+废水处理研究[J].环境科学与技术,2016(2):139-142.
[9]YE M,LI G,YAN P,et al.Removal of metals from lead-zinc mine tailings using bioleaching and followed by sulfide precipitation[J].Chemosphere,2017,185):1189-1196.
[10]王刚,管映兵,常青,等.聚乙烯亚胺基黄原酸钠处理重金属废水实验研究[J].水处理技术,2018,44(2):76-79.
[11]CECHINEL M A P,MAYER D A,POZDNIAKOVAT A,et al.Removal of metal ions from a petrochemical wastewater using brown macro-algae as natural cation-exchangers[J].Chem Eng J,2016,286:1-15.
[12]IDASZKIN Y L,CAROL E,MARIA D P A.Mechanism of removal and retention of heavy metals from the acid mine drainage to coastal wetland in the Patagonian marsh[J].Chemosphere,2017,183:361-370.
[13]陈雅琼,于春波.高分子型重金属去除剂处理含铜废水[J].水处理技术,2016,42(3):99-102.
[14]GRANT-PREECE P,SCHMIDTKE L M,BARRI C,et al.Photoproduction of glyoxylic acid in model wine:Impact of sulfur dioxide,caffeic acid,p H and temperature[J].Food Chem,2017,215:292-300.
[15]铜、镍、钴工业污染物排放标准:GB 25467-2010[S].