富营养化水体中有机氯农药在沉积物水间的迁移行为-环境科学专业论文.docxVIP

ABSTRACT Hexachlorocyolohexane isomers (HCHs) are typical persistent organic pollutants (POPs). In this thesis，Haihe River was selected 翻白e typical contaminated area.ηle transport dynamics of 伽HCH and y-HCH between sediment and the overlying water was studied by simulating laboratory experiments. Effects of composition and content 、of organic matter and temperature on the transport were considered. 丁hepu叩ose is to reveal the transport mechanism of organochlorine pesticides (OCPs) between sediment and water in eutrophic waters. 、 、 The transport of HCH in sediment / water interface wωsimulated in this thesis. A The results provide theoretical basis for in-depth study of the distribution and fate of HCH in Haihe River mainstream ，which is significantly important for the ecological environment risk assessment，toxic chemical management and environmental restoration. It also plays. an important guiding role for the economic development and the health of residents in the Haihe River basin. 丁he results showed that enrichment of organic matter in sediments increased the degradation of φHCH and 沪HCH. Along with thè increase of tempera阳re，the degradation on HCH in sediments was enhanced. The enrichment of organic ma阳:r increased the sediments so甲tíon of hydrophobic organic compounds，and the non-linear adsorption was more obvious when the degree of carbonization of 0咆anic m州时 is higher. Wi伽 the content of organic ma饥er in sediments increased ，the adsorption capacity ofpollutants increased. 丁he organic ma忧er relieved the release of HCH 仕Om sediments and reduced the mass transfer t1ux. As the temperature decreased ，the release rate and mass transport t1ux decreased. As the content of dissolved 0咆anic carbon (DOC) in overlying water increased，the mass transfer t1ux increased. Wi由the increase of depth，the probability \ ofHCH in sediments releasing into overlying water decreased. The calculated results showed th矶 As the add of organic matter in the sediments， 咱 the tran