Heavy metal contaminant remediation study of western Xiamen Bay sediment, China: Laboratory bench scale testing results
Feng, Huan（Montclair State Univ, Dept Earth & Environm Studies, Montclair, NJ 07043 USA）
Yu, Xingtian（ Environm Monitoring Stn, Xiamen, Fujian, Peoples R China）
Liang, Rongyuan（ Environm Monitoring Stn, Xiamen, Fujian, Peoples R China）
- 海洋环境－已发表论文 
A surface sediment sample (<5 cm) 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)(2)C2O4 + 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. (C) 2009 Elsevier B.V. All rights reserved.