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中国农学通报 ›› 2021, Vol. 37 ›› Issue (14): 84-89.doi: 10.11924/j.issn.1000-6850.casb20200300287

所属专题: 资源与环境

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

污水厂中草甘膦降解菌的筛选及其降解特性研究

许斌1, 韩萍1(), 薛玉芬2   

  1. 1青岛市团岛污水处理厂,山东青岛 266002
    2青岛水务集团环境能源有限公司,山东青岛266002
  • 收稿日期:2020-03-31 修回日期:2020-09-17 出版日期:2021-05-15 发布日期:2021-05-19
  • 通讯作者: 韩萍
  • 作者简介:许斌,男,1969年出生,山东青岛人,研究员,本科,主要从事污水处理和污泥处置方面研究。

Screening of Glyphosate Degrading Bacteria in Wastewater Treatment Plant and Study on Their Degradation Characteristics

Xu Bin1, Han Ping1(), Xue Yufen2   

  1. 1Qingdao Tuandao Sewage Treatment Plant, Qingdao Shandong 266002
    2Qingdao Water Affairs Group Environmental Energy Co., Ltd., Qingdao Shandong 266002
  • Received:2020-03-31 Revised:2020-09-17 Online:2021-05-15 Published:2021-05-19
  • Contact: Han Ping

摘要:

为解决农业生产中草甘膦污染水体问题,本文通过利用草甘膦为唯一碳源,从污水厂活性污泥中分离、纯化、培养,筛选出降解草甘膦能力较强的菌株PP84,通过观察形态和16S rDNA序列鉴定为巨大芽孢杆菌(Bacillus megaterium),试验研究了菌株对草甘膦的降解特性和影响因素。结果表明,Bacillus megaterium菌株在草甘膦浓度为500 mmol/L的培养基中,48 h内对草甘膦的降解率可达54.67%,生长范围宽泛,最适合生长的环境为pH 6.0。在重金属毒性实验中发现,当环境中Cu2+浓度在50 mg/kg,对巨大芽孢杆菌降解草甘膦有一定的毒害作用,降解率为65.6%,当Cu2+浓度为250 mg/kg时对菌株的生长极其不利,对草甘膦的降解率降为37.9%;环境中Cd2+浓度为0.25 mg/kg和2.5 mg/kg时对巨大芽孢杆菌降解草甘膦都有一定的抑制作用,菌株对草甘膦的降解率分别只有50.4%、28.8%。

关键词: 草甘膦, 活性污泥, 生物降解, 巨大芽孢杆菌

Abstract:

To solve the problem of glyphosate pollution of water body in agricultural production, this paper reported a strain with strong degradation ability of glyphosate, Bacillus megaterium, which was isolated from sewage plant activated sludge, and studied its growth curve and glyphosate degradation ability. Results showed that the glyphosate degradation rate within 48 h was up to 54.67% by Bacillus megaterium grown in 500 mmol/L glyphosate medium. Bacillus megaterium could grow in a broad range of pH with the most suitable growth pH value of 6.0. In heavy metal toxicity test, Cu2+ concentration of 50 mg/kg in the environment was disadvantageous to the degradation of glyphosate by Bacillus megaterium, and the degradation rate was 65.6%, while the Cu2+ concentration of 250mg/kg could reduce the degradation rate to 37.9%; Cd2+ concentration of 0.25 mg/kg and 2.5 mg/kg could inhibit the degradation rate of Bacillus megaterium to 50.4% and 28.8%, respectively.

Key words: glyphosate, activated sludge, biodegradation, Bacillus sp.

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