| Evaluation of ability of Rock Check Dam to prevent the transportation of Pb-contaminated sediment in Khli Ti Creek, Thailand |
| |
| 作者姓名： | Paweena Panichayapichet Suwanchai Nitisoravut Arpa Wangkiat |
| |
| 作者单位： | [1]The Joint Graduate School of Energy and Environment, King Mongkut＇s University of Technology Thonburi, 91 Pracha-Uthit Road, Bangmod, Tungkru, Bangkok, 10140, Thailand [2]Sirindhorn International Institute of Technology, Thammasart University, RO.Box 22, Thammasat-Rangsit Post Office, Klong Luang, Pathumthani 12121, Thailand [3]Faculty of Engineering, Rangsit University, 52/347 Muang Ake, Phaholyothin Rd, Lakhok, Pathumthani, 12000, Thailand |
| |
| 摘 要： |
|
| 关 键 词： | 沉积物 环境污染 重金属 铅 水体污染 |
Evaluation of ability of Rock Check Dam to prevent the transportation of Pb-contaminated sediment in Khli Ti Creek, Thailand |
| |
| Paweena Panichayapichet Suwanchai Nitisoravut Arpa Wangkiat.Evaluation of ability of Rock Check Dam to prevent the transportation of Pb-contaminated sediment in Khli Ti Creek, Thailand[J].Chinese Journal of Geochemistry,2006,25(B08):119-120. |
| |
| Abstract: | Discharge of wastewater from the retaining pond of a Pb ore-flotation plant since 1967 and breaching of the retaining pond in April 1998 contaminated 17540 cbm of river bank sediment with 833 ton Pb, nearly 19 km along the Khli Ti Creek. High blood Pb concentration was detected in many inhabitants. Prohibition of water and aquatic biota consumption has caused difficulties for rural people to make their ends meet. The governmental agency closed the ore-floatation plant and built 2 rock check dams downstream. The dam was designed to slow down water velocity and precipitate particulate matter. Contaminated sediments that have been trapped in front of the dam were planned to be dredged and disposed in landfill. Until now, no dredging is performed because some experts claim that dredging will resuspend the contaminated sediment into the water column, and fresh sediment deposited during periods of high flow will cover the contaminated sediment. The aim of this study was to evaluate the ability of the rock check dam to prevent the transportation of Pb-contaminated sediment in the Khli Ti Creek. Sediment located before and after the rock check dam and 2 km downstream were collected in September 2003 and May 2005. During September 2003, Pb concentrations in sediment deposited before and after the rock check dam and 2 km downstream were 48840, 53741 and 36020 mg/kg, respectively. These results showed that Pb-contaminated sediment was transported over the first rock check dam but still remained after the rock check dam. Result of May 2005 sampling also showed the same trend, although with different ranges due to seasonal variation, types of collected sediment, sample preparation and analytical techniques. Pb concentrations in sediment were 209684, 306775 and 33760 mg/kg, respectively. |
| |
| Keywords: | sediment contamination heavy metal pollution lead rock check dam remediation |
| 本文献已被 维普 等数据库收录！ |
|
