|
| Effect of tall fescue on electro-bioremediation of petroleum-contaminated soil |
| Received:December 31, 2019 |
| View Full Text View/Add Comment Download reader |
| KeyWord:electrokinetic remediation;petroleum-contaminated soil;electric current;rhizosphere microorganism;enzymatic activity |
| Author Name | Affiliation | E-mail | | MENG Xin | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Gang | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
National-Local Joint Engineering Laboratory of Contaminated Soil Remediation by Bio-physicochemical Synergistic Process, Shenyang 110016, China | ligang@iae.ac.cn | | GAO Peng | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | BIAN Cheng-peng | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | GUO Shu-hai | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
National-Local Joint Engineering Laboratory of Contaminated Soil Remediation by Bio-physicochemical Synergistic Process, Shenyang 110016, China | |
|
| Hits: 2185 |
| Download times: 2535 |
| Abstract: |
| In this study, the effects of plants on the changes in electric current, the quantity and activity of soil microorganisms, and the removal of pollutants through the process of remediation of contaminated soil were investigated by planting(tall fescue)in the electro-bioremediation 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 microorganisms and the amount of dehydrogenase activity in the EK+P+BIO group increased by 22.23% and 23.36% respectively, which were significantly 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 petroleum 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, improve soil microbial activity, and improve the removal rate of total petroleum hydrocarbon in the electro-bioremediation system. |
|
|
|
