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| Organochlorine pesticides (OCPs) such as HCHs and DDX have a long history of use in the world for control of agricultural pests. They have been recognized as a potential health risk due to their bioaccumulation, recalcitrance to degradation, and potential toxicity to humans and wildlife (Jones et al., 1999; Turusov et al., 2002; Behrooz et al., 2009; Trejo-Acevedo et al., 2009). Therefore, production and usage of HCHs and DDX are banned or restricted in many countries during the 1970s and 1990s (Voldner and Li, 1995; Li et al., 1999). However, concentrations of HCHs and DDX in soil in many former organochlorine pesticides-manufacturing plants were still high (Phillips et al., 2006; Yang et al., 2009). Therefore, removal of HCHs and DDX from contaminated soils has become urgent. Conventional nonbiological treatments for organochlorine-contaminated soils include excavation and incineration, thermal desorption (Foght et al., 2001), microwave-enhanced thermal treatment (Kawala and Atamanczuk, 1998), soil washing with surfactants (Kile and Chiou, 1989), supercritical fluid extraction (Sahle-Demessie and Richardson, 2000) and biological treatment (Yao, et al., 2006). Among these treatment technologies, bioremediation was more cost-effective and less destructive to soils (Foght et al., 2001). |
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lixiaod001
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2Â¥2009-10-07 08:24:42
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men-sc(½ð±Ò+5,VIP+0): 10-9 12:37
men-sc(½ð±Ò+5,VIP+0): 10-9 12:37
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Organochlorine pesticides (OCPs) such as HCHs and DDX have LONG BEEN DOCUMENTED for control of agricultural pests WITH THE potential health risk AND toxicity to humans and wildlife due to their bioaccumulation, recalcitrance to degradation (Jones et al., 1999; Turusov et al., 2002; Behrooz et al., 2009; Trejo-Acevedo et al., 2009). AS A RESULT, HCHs and DDX are banned or restricted in many countries SINCE the 1970s (Voldner and Li, 1995; Li et al., 1999). However, concentrations of HCHs and DDX in soil in many former organochlorine pesticides-manufacturing plants were still high (Phillips et al., 2006; Yang et al., 2009). Therefore, THE removal of HCHs and DDX from contaminated soil become AN ISSUE. Conventional nonbiological treatments for organochlorine-contaminated soil include excavation and incineration, thermal desorption (Foght et al., 2001), microwave-enhanced thermal treatment (Kawala and Atamanczuk, 1998), soil washing with surfactants (Kile and Chiou, 1989), supercritical fluid extraction (Sahle-Demessie and Richardson, 2000) and biological treatment (Yao, et al., 2006) ETC. Among these OPTIONS, bioremediation IS more cost-effective and less destructive to soil (Foght et al., 2001). SIOL ûÓи´Êý°É£¬ÊǸö¼¯ºÏÃû´Ê¡£ |
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