State Key Laboratory of Marine Environmental Science, Environmental Science Research Center, Xiamen University, Xiamen, Fujian, PR China.
J Hazard Mater. 2009 Dec 15;172(1):108-16. doi: 10.1016/j.jhazmat.2009.06.138. Epub 2009 Jul 3.
A surface sediment sample (<5cm) was collected from a sewage sludge contaminated site (118 degrees 02.711'E, 24 degrees 32.585'N) within western Xiamen Bay, China, in July 2005 for a sediment decontamination study. A series of laboratory-based experiments under various conditions were performed using chemical complexation reagents (e.g., H2C2O4, EDTA-2Na, etc.) and their combination in order to provide information for sediment remediation technology development. In this study, the results suggest that aeration and agitation of the sediment samples in distilled-deionized water (DDW) have either no or weak (<30%) effect on metal removal, whereas agitation, aeration and rotation of the samples in chemical complexation solutions yield much better metal removal efficiency (up to 90%). A low pH condition (e.g., pH<3) and a low solid to liquid ratio (e.g., S:L=1:50) could increase metal removal efficiency. The experimental results suggest that 0.20 M (NH4)2C2O4+0.025 M EDTA combination with solid:liquid ratio=1:50 and 0.50 M ammonium acetate (NH4Ac)+0.025 M EDTA combination with solid:liquid ratio=1:50 are the most effective methods for metal removal from the contaminated sediments. This research provides additional useful information for sediment metal remediation technology development.
于 2005 年 7 月，从中国厦门湾西部一个受污水污泥污染的地点（118 度 02.711'E，24 度 32.585'N）采集了一个表层沉积物样品（<5cm），以进行沉积物去污研究。为了开发沉积物修复技术，进行了一系列基于实验室的实验，使用了化学络合剂（例如 H2C2O4、EDTA-2Na 等）及其组合，以提供信息。在这项研究中，结果表明，在蒸馏去离子水中（DDW）对沉积物样品进行曝气和搅拌，对金属去除的影响要么没有，要么很小（<30%），而在化学络合剂溶液中对样品进行搅拌、曝气和旋转，则可大大提高金属去除效率（高达 90%）。低 pH 值条件（例如 pH<3）和低固液比（例如 S:L=1:50）可以提高金属去除效率。实验结果表明，0.20 M（NH4）2C2O4+0.025 M EDTA 与固液比=1:50 的组合，以及 0.50 M 乙酸铵（NH4Ac）+0.025 M EDTA 与固液比=1:50 的组合是从受污染沉积物中去除金属的最有效方法。这项研究为沉积物金属修复技术的发展提供了更多有用的信息。
