| 韩悦,孙丽娜,吕良禾,王辉,苑春莉,王晓旭,吴昊.鼠李糖脂-纳米零价铁-丙酮酸钠强化微生物厌氧-好氧降解土壤DDTs效果研究[J].农业环境科学学报,2023,42(4):799-810. |
| 鼠李糖脂-纳米零价铁-丙酮酸钠强化微生物厌氧-好氧降解土壤DDTs效果研究 |
| Anaerobic-aerobic bioremediation of DDT-contaminated soil and the compound strengthening of rhamnolipid-nano zero-valent iron-sodium pyruvate |
| 投稿时间：2022-08-03 |
| DOI：10.11654/jaes.2022-0786 |
| 中文关键词: DDTs 鼠李糖脂 纳米零价铁 丙酮酸钠 微生物修复 |
| 英文关键词: DDT rhamnolipid nano zero-valent iron sodium pyruvate microbial remediation |
| 基金项目:国家重点基础研究发展计划项目（973计划）（2014CB441106） |
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| 中文摘要: |
| 为了改善目前土壤DDTs污染微生物修复效率相对较低的现状，以沈阳市沈北新区某设施农业大棚土壤为研究对象，通过批实验研究了鼠李糖脂（RL）、纳米零价铁（nZVI）和丙酮酸钠（C）强化微生物顺序厌氧-好氧处理对土壤DDTs及其组分降解率的影响。结果表明：RL、nZVI和C强化微生物顺序厌氧-好氧处理可显著提高土壤DDTs和p，p'-DDT的降解率（P<0.05），不同强化处理土壤DDTs和p，p'-DDT降解率依次为RL+nZVI+C联合处理＞nZVI处理>RL处理>C处理>CK处理；RL、nZVI和C联合强化微生物厌氧-好氧顺序处理90 d时，土壤DDTs、p，p'-DDT和p，p'-DDE降解率分别为43.05%~68.81%、12.06%~96.90%和3.33%~60.87%。其中，0.05 mg·kg-1RL、0.50% nZVI以及0.30 mmol·kg-1C联合强化厌氧-好氧处理土壤DDTs、p，p'-DDT和p，p'-DDE降解率分别为68.81%、96.90%和60.87%，厌氧与好氧降解比分别为3.97、6.70和5.00。研究表明，RL、nZVI与C联合强化微生物顺序厌氧脱氯与好氧放大处理，促进了土壤DDTs高效降解，同时避免了难降解、毒性更大的p，p'-DDE的产生与积累，展示了RL、nZVI与C联合强化微生物顺序厌氧-好氧降解在修复DDTs污染土壤方面的应用潜力。 |
| 英文摘要: |
| 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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