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生态学杂志 ›› 2011, Vol. 30 ›› Issue (03): 424-429.

• 研究报告 • 上一篇    下一篇

2,4-二氯苯酚在土壤与河流底泥中降解动力学

侯永侠,杨继松,陈红亮,宋雪英,胡晓钧,李玉双   

  1. 沈阳大学区域污染环境生态修复教育部重点实验室, 沈阳 110044
  • 出版日期:2011-03-08 发布日期:2011-03-08

Degradation dynamics of 2,4-dichlorophenol in soil and river sediment.

HOU Yong-xia, YANG Ji-song, CHEN Hong-liang, SONG Xue-ying, HU Xiao-jun, LI Yu-shuang   

  1.  Key Laboratory of Regional Environment and Eco-Remediation, |Ministry of Education, Shenyang University, Shenyang 110044, China
  • Online:2011-03-08 Published:2011-03-08

摘要: 以南京化学工业园内四柳河沿岸土壤与河流底泥为研究对象,通过土壤灭菌、温度与污染物初始浓度调控,研究了2,4-二氯苯酚在土壤与河流底泥中降解动力学及其影响因子。结果表明:微生物对2,4-二氯苯酚降解起主导作用,在45 d内,非灭菌土壤和河流底泥的降解率分别是灭菌条件下的1.5~3倍、1.4~2.8倍,土壤和河流底泥中的2,4-二氯苯酚微生物降解量分别为0.128~0.599和0.113~0.718 mg·kg-1,非灭菌处理半衰期时间短于灭菌处理;(10±1)℃~(30±1)℃范围内,随着温度的增高,2,4-二氯苯酚降解加快,在(30±1)℃土壤与河流底泥中残留量最小,分别为0.305和0.203 mg·kg-1,半衰期也最短;土壤与河流底泥中的2,4-二氯苯酚均在其浓度为0.5 mg·kg-1时降解最快,随着初始浓度的增加,2,4-二氯苯酚降解速度呈现递减趋势,半衰期增长。

Abstract: Soil and sediment samples were collected from the sites along the banks of the fourth Liuhe River and in the River in Nanjing Chemical Industrial Park, and, through soil sterilization and the controlling of temperature and 2,4-DCP initial concentration, the degradation dynamics of 2,4-dichlorophenol (2,4-DCP) in the soils and river sediment and related affecting factors were studied. Microbes played dominant roles in degrading 2,4-DCP. Within 45 d, the degradation rate of 2,4-DCP in non-sterilized soils and river sediment was 1.5-3 and 1.4-2.8 times of that in sterilized soils and river sediment, respectively. The microbe-degraded amount of 2,4-DCP in the soils and river sediment was 0.128-0.599 and 0.113-0.718 mg·kg-1, respectively, and the half-life time of 2,4-DCP was shorter in non-sterilized than in sterilized treatment. Within the range of (10±1) ℃-(30±1) ℃, the degradation of 2,4-DCP was accelerated with increasing temperature. At (30±1) ℃, the residual amount of 2,4-DCP in the soils and river sediment was 0.305 and 0.203 mg·kg-1, respectively, and the residual amount and half-life time were the smallest and shortest. The degradation speed of 2,4-DCP in the soils and river sediment was the fastest when its initial concentration was 0.5 mg·kg-1. With the increase of 2,4-DCP initial concentration, the degradation speed of 2,4-DCP had a decreasing trend, and the half-life time became longer.

Key words: Eriocheir sinensis, Gut, Chitin, Digestive bacteria