期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 615, 期 -, 页码 78-86出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.09.208
关键词
Immobilization; Leucobacter sp JW-1; Prometryn; Biodegradation; Polyvinyl alcohol; Sodium alginate
资金
- National High Technology Research and Development Program of China [2013AA102804B]
- National Natural Science Foundation of China [31572033]
- National Key Research and Development Program of China [2016YFD0200201-1]
- National Innovation and Entrepreneurship Program of College Students of China [201610364020]
The s-triazine herbicides, such as prometryn, have been widely used in agriculture and have raised much public concern over their contamination of water and soil. Leucobacter sp. JW-1 cells were immobilized in polyvinyl alcohol sodium alginate (PVA-SA) beads and then used to degrade prometryn. Orthogonal array experiments showed that the optimal immobilization conditions of PVA-SA immobilized Leucobacter sp. JW-1 beads (PSLBs) were 3% JW-1 cells (w/v, wet weight), 10-12% (w/v) PVA, 2-3% (w/v) calcium chloride, and an immobilization time of 24-36 h. The PSLBs were more tolerance to pH, temperature and salinity changes than free JW-1 cells and were stable and effective for degrading prometryn through six reuse cycles without losing their degradation capacity. The half-life of prometryn degradation by PSLBs at 100 mg L-1 in pesticide plant wastewaters were 1.1-6.9 h. The rate constants of prometryn degradation by PSLBs in wastewaters ranged from 304 to 576 mg L-1 day(-1), which were approximately 1.25-118 times those of degradation by free JW-1 cells. The PSLBs degraded 99.9% of atrazine, 99.9% of ametryn, 97.8% of propazine, 100.0% of simetryn, 77.9% of simazine, 98.9% of terbuthylazine, 95.2% of prometon, 98.9% of atraton, and 31.6% of terbumeton at an initial concentration of 50 mg L-1 of each herbicide in 2 days. This study indicates that PSLBs persistently biodegrade s-triazine herbicides better than JW-1 free cells, and can be an efficient, safe and reusable biomaterial for the removal of striazine herbicides from contaminated sites. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据