Dynamic fate modeling of γ-hexachlorocyclohexane in the lower reaches of the Liao River
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- 作者：Zhenyu Liu (1)
Fenglin Yang (1)
Xie Quan (1)
Xiaohong Zhang (2) - 关键词：QWASI model ; fate ; γ ; HCH ; persistent organic pollutants (POPs) ; temperature
- 刊名：Frontiers of Environmental Science & Engineering
- 出版年：2007
- 出版时间：May 2007
- 年：2007
- 卷：1
- 期：2
- 页码：166-171
- 全文大小：249KB
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Fenglin Yang (1)
Xie Quan (1)
Xiaohong Zhang (2)
1. Department of Environmental Science and Technology, School of Environmental and Biological Science & Technology, Dalian University of Technology, Dalian, 116024, China
2. Environmental Protection Company of Dalian, Dalian, 116023, China - ISSN：2095-221X
文摘
A QWASI model dependent on temperature is parameterized to describe the long-term fate of persistent organic pollutants (POPs) in the Liao River. The model parameters, namely fugacity capacity, degradation rate, and transfer coefficient, are profoundly affected by temperature. This model is used to simulate the fate of γ-hexachlorocyclohexane (γ-HCH) in the lower reaches of the Liao River from 1998 to 2008. Modeling results show that γ-HCH fugacity capacities in air, water, and sediment increase as temperature decreases, and the transfer and transformation rate coefficients increase as temperature increases. The variations of transfer and transformation parameter D values depend on fugacity capacities, and transfer and transformation coefficients simultaneously. The performance of the model is evaluated by comparing the predicted and observed concentrations in the water and sediment of the Liao River. The predicted values agree well with the observed value in the order of magnitude, in most cases within the factor of 3. It is believed that the model is appropriate for simulating the long term fate of POPs in the Liao River.