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| Anaerobic-aerobic bioremediation of DDT-contaminated soil and the compound strengthening of rhamnolipid-nano zero-valent iron-sodium pyruvate |
| Received:August 03, 2022 |
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| KeyWord:DDT;rhamnolipid;nano zero-valent iron;sodium pyruvate;microbial remediation |
| Author Name | Affiliation | E-mail | | HAN Yue | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | SUN Lina | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | sln629@163.com | | Lü Lianghe | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | WANG Hui | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | YUAN Chunli | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | WANG Xiaoxu | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | | | WU Hao | Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education, Shenyang University, Shenyang 110044, China | |
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| Abstract: |
| Current dichlorodiphenyltrichloroethane（DDT）-contaminated soil microbial remediation efficiency is relatively low. This study used an agricultural greenhouse soil facility in Shenbei New District of Shenyang as the research object of a batch experiment to study the enhancement of rhamnolipid（RL）, nano zero-valent iron（nZVI）, and sodium pyruvate（C）on microbial sequential anaerobic-aerobic treatment for the degradation of DDT and its components. The results showed that the improved sequential anaerobic-aerobic treatments with RL, nZVI, and C significantly increased the degradation rates of DDT and p, p ' -DDT in soil（P<0.05）. The results also revealed that the degradation rates of DDT and p, p' -DDT in different enhanced treatments were in the order of RL+nZVI+C combined treatment > nZVI treatment > RL treatment > C treatment > CK treatment. After 90 days of RL, nZVI, and C combined with enhanced microbial anaerobic-aerobic sequential treatment, the degradation rates of DDT, p, p ' - DDT, and p, p' - DDE were 43.05% – 68.81%, 12.06% – 96.90%, and 3.33%–60.87%, respectively. Among these, the degradation rates of DDT, p, p ' -DDT, and p, p' -DDE under the combined enhanced anaerobic-aerobic treatment with 0.05 mg · kg-1 RL, 0.50% nZVI, and 0.30 mmol · kg-1 C were 68.81%, 96.90%, and 60.87% respectively; the ratios of anaerobic to aerobic degradation were 3.97, 6.70, and 5.00, respectively. This study shows that a combination of RL, nZVI, and C enhances microbial sequential treatment of anaerobic dechlorination and aerobic amplification, which promotes the efficient degradation of DDT in soil, and avoided the production and accumulation of p, p ' -DDE, which is difficult to degrade and more toxic. This study also demonstrates the potential of combined RL, nZVI, and C to enhance microbial sequential anaerobic-aerobic degradation in the remediation of DDT-contaminated soil. |
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