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Heavy metal removal from sewage sludge under citric acid and electroosmotic leaching processes
Separation and Purification Technology ( IF 8.6 ) Pub Date : 2020-03-08 , DOI: 10.1016/j.seppur.2020.116822
Degang Ma , Meizhong Su , Jingjing Qian , Qian Wang , Fanyi Meng , Xiaomei Ge , Yu Ye , Chunfeng Song

The heavy metals present in sludge are very harmful to the environment and the human body. It is necessary to remove them before sludge disposal. In this study, an ex situ method for removing heavy metals from sludge using electroosmosis was designed, and experiments were conducted to study the effects of electroosmosis voltages (30 V, 40 V and 50 V), citric acid concentrations (0.03 mol/kg, 0.06 mol/kg, 0.09 mol/kg and 0.12 mol/kg) and the power supply (continuous and interrupted) on the removal rate of heavy metals (Cu, Cr, Cd, Zn and Pb). The study found that the combination of the citric acid pretreatment and electroosmosis can effectively improve the removal rate of heavy metals. An appropriate increase in the voltage and citric acid concentration can improve the removal rate of heavy metals. The best combination was determined to be 40 V and 0.09 mol/kg. Under these conditions, the removal rates of Cu, Cr, Cd, Zn and Pb, were 14.39%-41.28% (continuous power supply) and 21.78%-42.36% (interrupted power supply). The interrupted power supply effectively improved the removal rates of Cd and Zn but reduced the removal rates of Cr and Pb. The power supply mode had no significant effect on the removal rate of Cu.

Heavy metal speciation was analyzed by the BCR method, and the relationship between the ratio of easily removed metal speciation and the removal rate was studied. The increase in the ratio of easily removed speciation was accompanied by an increase in the removal rate, indicating that citric acid and electroosmosis increased the removal rate by increasing the ratio of easily removed speciation. However, the high pH value around the cathode caused by the electrochemical reaction was not conducive to the removal of heavy metals.



中文翻译:

柠檬酸和电渗滤工艺去除污水污泥中的重金属

污泥中存在的重金属对环境和人体非常有害。有必要在污泥处理前将其清除。在这项研究中,设计了一种利用电渗技术从污泥中去除重金属的非原位方法,并进行了实验研究电渗透电压(30 V,40 V和50 V),柠檬酸浓度(0.03 mol / kg, 0.06 mol / kg,0.09 mol / kg和0.12 mol / kg)以及电源(连续和间断)对重金属(Cu,Cr,Cd,Zn和Pb)的去除率。研究发现,柠檬酸预处理和电渗结合可以有效提高重金属的去除率。适当增加电压和柠檬酸浓度可以提高重金属的去除率。确定最佳组合为40 V和0.09 mol / kg。在这些条件下,Cu,Cr,Cd,Zn和Pb的去除率分别为14.39%-41.28%(连续供电)和21.78%-42.36%(间断供电)。中断电源有效地提高了Cd和Zn的去除率,但降低了Cr和Pb的去除率。供电方式对铜的去除率没有显着影响。

利用BCR法分析了重金属的形态,研究了易去除金属形态的比例与去除率之间的关系。易去除物种的比率增加伴随着去除速率的增加,表明柠檬酸和电渗通过增加易去除物种的比率而增加了去除率。然而,由电化学反应引起的阴极周围的高pH值不利于去除重金属。

更新日期:2020-03-09
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