Affiliations: School of Environmental Science and Technology, Dalian University of Technology, Dalian 116012, China
Abstract: Effects of natural organic matters (NOM) and hydrated metal oxides (HMO) in sediments on the anaerobic degradation of γ-666, p,p'-DDT and HCB were investigated by means of removing NOM and HMO in Liaohe River sediments sequentially. The results showed that the anaerobic degradation of γ-666, p,p'-DDT and HCB followed pseudo-first-order kinetics in different sediments. But, the extents and rates of degradation were different, even the other conditions remained the same. Anaerobic degradation rates of γ-666, p,p'-DDT and HCB were 0.020 d^{−1}, 0.009 d^{−1} and 0.035 month^{−1} respectively for the sediments without additional carbon resources. However, with addition of carbon resources, the anaerobic degradation rates of γ-666, p, p'-DDT and HCB were 0.071 d^{−1}, 0.054 d^{−1} and 0.088 month^{−1} in the original sediments respectively. After removing NOM, the rates were decreased to 0.047 d^{−1}, 0.037 d^{−1} and 0.066 month^{−1}; in the sediments removed NOM and HMO, the rates were increased to 0.067 d^{−1}, 0.059 d^{−1} and 0.086 month^{−1}. These results indicated that NOM in the sediments accelerated the anaerobic degradation of γ-666, p,p'-DDT and HCB; the HMO inhibited the anaerobic degradation of γ-666, p,p'-DDT and HCB.
