Gitipour Saeid, Ahmadi Soheil, Madadian Edris, Ardestani Mojtaba
a Department of Environmental Engineering, Faculty of Environment , University of Tehran , Tehran , Iran.
Environ Technol. 2016;37(1):145-51. doi: 10.1080/09593330.2011.597784. Epub 2011 Nov 4.
In this research, the effect of soil washing in the removal of chromium- and cadmium-contaminated sludge samples collected from Pond 2 of the Tehran Oil Refinery was investigated. These metals are considered as hazardous substances for human health and the environment. The carcinogenicity of chromate dust has been established for a long time. Cadmium is also a potential environmental toxicant. This study was carried out by collecting sludge samples from different locations in Pond 2. Soil washing was conducted to treat the samples. Chemical agents, such as acetic acid, ethylenediaminetetra acetic acid (EDTA) and hydrochloric acid, were used as washing solutions to remove chromium and cadmium from sludge samples. The results of this study indicated that the highest removal efficiencies from the sludge samples were achieved using a 0.3 M HCl solution with 82.69% and 74.47% for chromium and cadmium, respectively. EDTA (0.1 M) in the best condition extracted 66.81% of cadmium and 72.52% of chromium from the sludges. The lowest efficiency values for the samples, however, were achieved using 3 M acetic acid with 41.7% and 46.96% removals for cadmium and chromium, respectively. The analysis of washed sludge indicated that the heavy metals removal decreased in the order of 3 M acetic acid < 0.1 M EDTA<0.3 M HCl, thus hydrochloric acid appears to offer a greater potential as a washing agent in remediating the sludge samples.
本研究调查了土壤淋洗对从德黑兰炼油厂2号池塘采集的铬和镉污染污泥样品的去除效果。这些金属被视为对人类健康和环境有害的物质。铬酸盐粉尘的致癌性早已得到证实。镉也是一种潜在的环境毒物。本研究通过从2号池塘的不同位置采集污泥样品来进行。对样品进行了土壤淋洗处理。使用化学试剂，如乙酸、乙二胺四乙酸（EDTA）和盐酸，作为洗涤溶液从污泥样品中去除铬和镉。本研究结果表明，使用0.3M HCl溶液时，污泥样品中铬和镉的去除效率最高，分别为82.69%和74.47%。在最佳条件下，EDTA（0.1M）从污泥中提取了66.81%的镉和72.52%的铬。然而，使用3M乙酸时，样品的去除效率最低，镉和铬的去除率分别为41.7%和46.96%。对洗涤后污泥的分析表明，重金属去除率的顺序为3M乙酸<0.1M EDTA<0.3M HCl，因此盐酸似乎作为一种洗涤试剂在修复污泥样品方面具有更大的潜力。
