4.7 Article

Enhancing inhibition of disinfection byproducts formation and opportunistic pathogens growth during drinking water distribution by Fe2O3/Coconut shell activated carbon

期刊

ENVIRONMENTAL POLLUTION
卷 268, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.115838

关键词

Biological activated carbon; Interface modification; Water quality stability; Biofilms; Shaping microbial community; Drinking water distribution systems

资金

  1. National Natural Science Foundation of China [51838005, 52000043]
  2. introduced innovative R&D team project under the The Pearl River Talent Recruitment Program of Guangdong Province [2019ZT08L387]
  3. project of Chinese Academy of Sciences [QYZDY-SSW-DQC004]

向作者/读者索取更多资源

Fe/CAC treatment can effectively inhibit the growth of opportunistic pathogens and reduce the formation of disinfection by-products. The attached biofilms on Fe/CAC surface enhance microbial metabolic activity, improving the removal efficiency of organic matter. Additionally, EPS substances on Fe/CAC exhibit stronger viscosity and stability, reducing the release of microbial biomass and EPS substances.
The effects of biological activated carbon treatment using Fe2O3 modified coconut shell-based activated carbon (Fe/CAC) were investigated on the occurrence of opportunistic pathogens (OPs) and formation of disinfection by-products (DBPs) in simulated drinking water distribution systems (DWDSs) with unmodified CAC as a reference. In the effluent of annular reactor (AR) with Fe/CAC, the OPs growth and DBPs formation were inhibited greatly. Based on the differential pulse voltammetry and dehydrogenase activity tests, it was verified that extracellular electron transfer was enhanced in the attached biofilms of Fe/CAC, hence improving the microbial metabolic activity and biological removal of organic matter especially DBPs precursors. Meanwhile, the extracellular polymeric substances (EPS) on the surface of Fe/CAC exhibited stronger viscosity, higher flocculating efficiency and better mechanical stability, avoiding bacteria or small-scale biofilms falling off into the water. Consequently, the microbial biomass and EPS substances amount decreased markedly in the effluent of Fe/CAC filter. More importantly, Fe/CAC did significantly enhance the shaping role on microbial community of downstream DWDSs, continuously excluding OPs advantage and inhibiting EPS production. The weakening of EPS in DWDSs resulted in decrease of microbial chlorine-resistance ability and EPS-derived DBPs precursors supply. Therefore, the deterioration of water quality in DWDSs was inhibited greatly, sustainably maintaining the safety of tap water. Our findings indicated that optimizing biological activated carbon treatment by interface modification is a promising method for improving water quality in DWDSs. (C) 2020 Elsevier Ltd. All rights reserved.

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