Utilizing surfactants to control the sorption, desorption, and biodegradation of phenanthrene in soil-water system
Utilizing surfactants to control the sorption, desorption, and biodegradation of phenanthrene in soil-water system
复制标题
利用表面活性剂控制土壤-水系统中菲的吸附、解吸和生物降解
DOI：
10.1016/s1001-0742(12)60221-6
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发表时间：
2013-07-01
影响因子：
6.9
通讯作者：
Zhu, Lizhong
中科院分区：
文献类型：
--
作者：
Jin, Haiwei;Zhou, Wenjun;Zhu, Lizhong
介绍并试验了土壤-水系统中菲的表面活性剂强化吸附和随后的解吸与生物降解一体化技术。对于轻度污染的农业土壤，阳离子-非离子混合表面活性剂强化有机污染物在土壤上的吸附可以减少有机污染物向植物的转移，从而保护农业生产。种植后，残留表面活性剂与添加的非离子表面活性剂相结合，还可以促进残留菲的解吸和生物降解，从而提供了一种经济有效的污染修复技术。结果表明，阳离子-非离子混合表面活性剂十二烷基溴吡啶(DDPB)和Triton X-100(TX100)显著提高了土壤菲的保持率。混合表面活性剂处理的污染土壤对菲的最大吸附系数K-d*约为不加表面活性剂的土壤的24.5倍，高于单独使用DDPB和TX100时的最大吸附系数K-d分别为16.7倍和1.5倍。另一方面，TX100能有效去除混合表面活性剂处理污染土壤中的菲，提高有机污染物的生物利用度。当TX100浓度大于2000 mg/L时，土壤对菲的解吸率大于85%，随着TX100浓度的增加，菲的解吸率接近100%。在表面活性剂存在下，菲的生物降解率在30d内达到95%以上。混合表面活性剂在10-22天内对菲的生物降解有一定的促进作用，而在实验结束时对菲的生物降解没有明显影响。研究结果为安全农产品的生产和有机污染物轻度污染土壤的修复方案提供了一定的参考价值。
An integrative technology including the surfactant enhanced sorption and subsequent desorption and biodegradation of phenanthrene in the soil-water system was introduced and tested. For slightly contaminated agricultural soils, cationic-nonionic mixed surfactant-enhanced sorption of organic contaminants onto soils could reduce their transfer to plants, therefore safe-guarding agricultural production. After planting, residual surfactants combined with added nonionic surfactant could also promote the desorption and biodegradation of residual phenanthrene, thus providing a cost-effective pollution remediation technology. Our results showed that the cationic-nonionic mixed surfactants dodecylpyridinium bromide (DDPB) and Triton X-100 (TX100) significantly enhanced soil retention of phenanthrene. The maximum sorption coefficient K-d* of phenanthrene for contaminated soils treated by mixed surfactants was about 24.5 times that of soils without surfactant (K-d) and higher than the combined effects of DDPB and TX100 individually, which was about 16.7 and 1.5 times K-d, respectively. On the other hand, TX100 could effectively remove phenanthrene from contaminated soils treated by mixed surfactants, improving the bioavailability of organic pollutants. The desorption rates of phenanthrene from these treated soils were greater than 85% with TX100 concentration above 2000 mg/L and approached 100% with increasing TX 100 concentration. The biodegradation rates of phenanthrene in the presence of surfactants reached over 95% in 30 days. The mixed surfactants promoted the biodegradation of phenanthrene to some extent in 10-22 days, and had no obvious impact on phenanthrene biodegradation at the end of the experiment. Results obtained from this study provide some insight for the production of safe agricultural products and a remediation scheme for soils slightly contaminated with organic pollutants.