Kim Soon-Oh, Moon Seung-Hyeon, Kim Kyoung-Woong, Yun Seong-Taek
Department of Earth and Environmental Sciences, College of Science, Korea University, Sungbuk-gu, Seoul.
Water Res. 2002 Nov;36(19):4765-74. doi: 10.1016/s0043-1354(02)00141-0.
In order to remove toxic heavy metals from municipal wastewater sludges, the ex situ electrokinetic technique was studied at pilot scale. This study focused on the feasibility of the electrokinetic removal of heavy metals from sludge and the effectiveness of this technique on the variations of abiotic (physicochemical) and biotic (intracellular and extracellular) speciations of heavy metals using several analytical methods. Even though the sludge used was taken from a municipal wastewater treatment plant, the sludge contained relatively high concentrations of target metal contaminants (Cd = 6.8 mg/kg, Cr = 115.6 mg/kg, Cu = 338.7 mg/kg, and Pb = 62.8 mg/kg). The removal efficiencies of heavy metals were significantly dependent on their speciations in the sludge matrices. The electrokinetic removal efficiencies of abiotic heavy metals exceeded 70% for the mobile and weakly bound fractions, such as, the exchangeable and carbonate fractions and were lower than 35% for the strongly bound fractions, such as, the organic/sulfide and residual fractions. In the case of the biotic heavy metals, the removal efficiencies of the extracellular fractions were slightly higher than those of the intracellular fractions.
为了从城市污水污泥中去除有毒重金属，在中试规模下研究了异位电动技术。本研究聚焦于电动去除污泥中重金属的可行性，以及该技术使用多种分析方法对重金属非生物（物理化学）和生物（细胞内和细胞外）形态变化的有效性。尽管所用污泥取自城市污水处理厂，但该污泥含有相对较高浓度的目标金属污染物（镉 = 6.8毫克/千克，铬 = 115.6毫克/千克，铜 = 338.7毫克/千克，铅 = 62.8毫克/千克）。重金属的去除效率显著取决于它们在污泥基质中的形态。对于可移动和弱结合部分，如交换性和碳酸盐部分，非生物重金属的电动去除效率超过70%，而对于强结合部分，如有机/硫化物和残留部分，去除效率低于35%。对于生物重金属，细胞外部分的去除效率略高于细胞内部分。
