SCI和EI收录∣中国化工学会会刊

›› 2014, Vol. 22 ›› Issue (10): 1162-1167.DOI: 10.1016/j.cjche.2014.09.007

• 能源、资源与环境技术 • 上一篇    下一篇

Chronic Response of Waste Activated Sludge Fermentation to Titanium Dioxide Nanoparticles

Yinguang Chen, Hui Mu, Xiong Zheng   

  1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
  • 收稿日期:2013-05-08 修回日期:2013-07-29 出版日期:2014-10-28 发布日期:2014-12-01
  • 通讯作者: Xiong Zheng
  • 基金资助:
    Supported by the National Hi-Tech Research and Development Programof China (863 Program) (2011AA060903), the National Natural Science Foundation of China (41301558 and 51278354), and Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation (STGEF).

Chronic Response of Waste Activated Sludge Fermentation to Titanium Dioxide Nanoparticles

Yinguang Chen, Hui Mu, Xiong Zheng   

  1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
  • Received:2013-05-08 Revised:2013-07-29 Online:2014-10-28 Published:2014-12-01
  • Supported by:
    Supported by the National Hi-Tech Research and Development Programof China (863 Program) (2011AA060903), the National Natural Science Foundation of China (41301558 and 51278354), and Shanghai Tongji Gao Tingyao Environmental Science & Technology Development Foundation (STGEF).

摘要: Due to the large-scale production and wide applications,many nanoparticles (NPs) enter wastewater treatment plants and accumulate in activated sludge. It is reported that titaniumdioxide (TiO2) NPs showsevere damage to many model microbes. However, it is still unknown whether the long-term (e.g., 100 d) presence of TiO2 NPs would affect the performance of sludge fermentation. In this study, long-term exposure experiments (105 d) were conducted to investigate the potential risk of TiO2 NPs to sludge fermentation system. It is found that the presence of environmentally relevant [6 mg·(g TSS)-1] and higher [150 mg·(g TSS)-1] concentrations of TiO2 NPs does not affect methane production fromsludge fermentation. The analysis of fluorescence in situ hybridization indicates that these concentrations of TiO2 NPs present marginal influences on abundances of bacteria and methanogenic archaea in sludge fermentation system. The viability of sludge microorganisms and activities of key enzymes related tomethane production such as protease, acetate kinase, and coenzyme F420 are unchanged by the long-term presence of 6 and 150 mg·(g TSS)-1 of TiO2 NPs. Further investigations reveal that the insolubility of NPs and the protection role of sludge extracellular polymeric substances are the main reasons for the marginal influence of TiO2 NPs on sludge fermentation.

关键词: Titanium dioxide nanoparticles, Waste activated sludge, Fermentation, Long-term effect, Mechanism

Abstract: Due to the large-scale production and wide applications,many nanoparticles (NPs) enter wastewater treatment plants and accumulate in activated sludge. It is reported that titaniumdioxide (TiO2) NPs showsevere damage to many model microbes. However, it is still unknown whether the long-term (e.g., 100 d) presence of TiO2 NPs would affect the performance of sludge fermentation. In this study, long-term exposure experiments (105 d) were conducted to investigate the potential risk of TiO2 NPs to sludge fermentation system. It is found that the presence of environmentally relevant [6 mg·(g TSS)-1] and higher [150 mg·(g TSS)-1] concentrations of TiO2 NPs does not affect methane production fromsludge fermentation. The analysis of fluorescence in situ hybridization indicates that these concentrations of TiO2 NPs present marginal influences on abundances of bacteria and methanogenic archaea in sludge fermentation system. The viability of sludge microorganisms and activities of key enzymes related tomethane production such as protease, acetate kinase, and coenzyme F420 are unchanged by the long-term presence of 6 and 150 mg·(g TSS)-1 of TiO2 NPs. Further investigations reveal that the insolubility of NPs and the protection role of sludge extracellular polymeric substances are the main reasons for the marginal influence of TiO2 NPs on sludge fermentation.

Key words: Titanium dioxide nanoparticles, Waste activated sludge, Fermentation, Long-term effect, Mechanism