科研之友
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摘要
In this study, the effects of plants on the changes in electric current, the quantity and activity of soil microorganisms, and the re- moval of pollutants through the process of remediation of contaminated soil were investigated by planting(tall fescue)in the electro-biore- mediation system. Four treatments were set up in the experiment:(1)Electro-bioremediation(EK+BIO),(2)Electric-phytoremediation (EK+P)(, 3)Phyto-bioremediation(P+BIO)(, 4)Phyto-electro-bioremediation(EK+P+BIO). The experiments were performed for 60 days. The results show that the tall fescue has a significant retarding effect on the reduction of electric current in soil. Compared with the test without the electric field, the biomass of tall fescue was higher in the test with the electric field. After 15 days, the number of microorgan- isms and the amount of dehydrogenase activity in the EK+P+BIO group increased by 22.23% and 23.36% respectively, which were signifi- cantly higher than those of other tests. At 30 d and 60 d, the number of microorganisms and the amount of dehydrogenase activity in each treatment were reduced, but the values of the EK+P+BIO group were still the highest in all the treatments. In addition, 48.21% of total pe- troleum hydrocarbon was removed in the EK+P+BIO group, which was significantly higher than other treatments. Therefore, the planting of tall fescue can effectively delay the trend of electric current attenuation, provide a favorable root zone environment for microorganisms, im- prove soil microbial activity, and improve the removal rate of total petroleum hydrocarbon in the electro-bioremediation system.
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