中国环境科学
中國環境科學
중국배경과학
CHINA ENVIRONMENTAL SCIENCE
2010年
3期
349-356
,共8页
电镀污泥%电动修复%重金属%形态%连续提取
電鍍汙泥%電動脩複%重金屬%形態%連續提取
전도오니%전동수복%중금속%형태%련속제취
electroplating sludge%electrokinetic technology%heavy metals%fractionation%sequential extraction
为提高电动修复技术去除电镀污泥中的重金属(Cu,Pb,Zn,Cr,Ni)的效率,采用污泥预酸化处理及阴极pH值控制处理2种途径进行强化,反应过程中电压为32V,处理时间为7d,结果表明,电镀污泥酸化pH值至4.5时,污泥中重金属的可移动性明显提高了,依次为Cr＞Ni＞Zn＞Cu＞Pb;污泥预酸化加阴极pH值控制处理能使电镀污泥中Zn、Ni、Cu和Pb交换态、碳酸盐结合态和有机硫化物态转化为可溶离子态,转化量大小依次为Ni＞Zn＞Cu＞Pb,且该处理Zn、Ni、Cu和Pb的去除率分别达到74.02%、68.38%、39.22%、21.37%;但污泥预酸化及阴极pH值控制处理都不利于Cr的去除,对照处理Cr去除率为77.83%,污泥预酸化处理去除率降为40.65%,污泥预酸化加阴极pH值控制处理降至12.80%.
為提高電動脩複技術去除電鍍汙泥中的重金屬(Cu,Pb,Zn,Cr,Ni)的效率,採用汙泥預痠化處理及陰極pH值控製處理2種途徑進行彊化,反應過程中電壓為32V,處理時間為7d,結果錶明,電鍍汙泥痠化pH值至4.5時,汙泥中重金屬的可移動性明顯提高瞭,依次為Cr＞Ni＞Zn＞Cu＞Pb;汙泥預痠化加陰極pH值控製處理能使電鍍汙泥中Zn、Ni、Cu和Pb交換態、碳痠鹽結閤態和有機硫化物態轉化為可溶離子態,轉化量大小依次為Ni＞Zn＞Cu＞Pb,且該處理Zn、Ni、Cu和Pb的去除率分彆達到74.02%、68.38%、39.22%、21.37%;但汙泥預痠化及陰極pH值控製處理都不利于Cr的去除,對照處理Cr去除率為77.83%,汙泥預痠化處理去除率降為40.65%,汙泥預痠化加陰極pH值控製處理降至12.80%.
위제고전동수복기술거제전도오니중적중금속(Cu,Pb,Zn,Cr,Ni)적효솔,채용오니예산화처리급음겁pH치공제처리2충도경진행강화,반응과정중전압위32V,처리시간위7d,결과표명,전도오니산화pH치지4.5시,오니중중금속적가이동성명현제고료,의차위Cr＞Ni＞Zn＞Cu＞Pb;오니예산화가음겁pH치공제처리능사전도오니중Zn、Ni、Cu화Pb교환태、탄산염결합태화유궤류화물태전화위가용리자태,전화량대소의차위Ni＞Zn＞Cu＞Pb,차해처리Zn、Ni、Cu화Pb적거제솔분별체도74.02%、68.38%、39.22%、21.37%;단오니예산화급음겁pH치공제처리도불리우Cr적거제,대조처리Cr거제솔위77.83%,오니예산화처리거제솔강위40.65%,오니예산화가음겁pH치공제처리강지12.80%.
To enhance the heavy metals (Cu,Pb,Zn,Cr and Ni) removal from electroplating sludge by electrokinetic(EK)enhancement technology,the EK experiments were carried out with and without pH adjustment in cathode chamber of acidified electroplating sludge.The electrokinetic experiments were conducted under a constant potential (32V) during seven days of EK process.The selective sequential extraction (SSE) was used to determine the fractionation of heavy metals in the electroplating sludge.The mobility of heavy metals in electroplating sludge significantly increased after its acidification at the pH of 4.5 and followed the order:Cr＞Ni＞Zn＞Cu＞Pb.After the experiment with acidified electroplating sludge and pH adjustment at cathode chamber,the removal efficiencies of heavy metals were:74.02% for Zn,68.38% for Ni,39.22% for Cu,21.37% for Pb,and the exchangeable,carbonate and sulfate fractionations of heavy metals in initial electroplating sludge were converted to soluble fractionation.However,electroplating sludge acidified treatment and pH adjusted in cathode chamber of acidified electroplating sludge treatment were not beneficial to improve the removal efficiency of Cr,the removal efficiency of Cr decreased from 77.83% of control treatment to 40.65% of electroplating sludge acidified treatment,and furthermore,decreased to 12.80% of pH adjusted in cathode chamber of acidified electroplating sludge treatment.
