Heavy metal contaminant remediation study of western Xiamen Bay sediment, China: laboratory bench scale testing results.
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.
Zhang
Luoping
L
State Key Laboratory of Marine Environmental Science, Environmental Science Research Center, Xiamen University, Xiamen, Fujian, PR China.
Feng
Huan
H
Li
Xiaoxia
X
Ye
Xin
X
Jing
Youhai
Y
Ouyang
Tong
T
Yu
Xingtian
X
Liang
Rongyuan
R
Chen
Weiqi
W
D002681:China; D004492:Edetic Acid / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry*; D010070:Oxalates / Q000737:chemistry; D012964:Sodium / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D014131:Trace Elements; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods
D008670:Metals; D019216:Metals, Heavy; D010070:Oxalates; D012997:Solvents; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D014867:Water; D004492:Edetic Acid; D012964:Sodium