EFFECT OF ULTRAVIOLET DISINFECTION ON GROWTH AND SECRETION CHARACTERISTICS OF MICROORGANISM IN RECLAIMED WATER

LIU Bo; WANG Yun-hong; WU Yin-hu; HU Hong-ying

doi:10.13205/j.hjgc.202002003

Volume 38 Issue 2

Feb. 2020

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2020 > 38(2): 28-34

LIU Bo, WANG Yun-hong, WU Yin-hu, HU Hong-ying. EFFECT OF ULTRAVIOLET DISINFECTION ON GROWTH AND SECRETION CHARACTERISTICS OF MICROORGANISM IN RECLAIMED WATER[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(2): 28-34. doi: 10.13205/j.hjgc.202002003

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LIU Bo, WANG Yun-hong, WU Yin-hu, HU Hong-ying. EFFECT OF ULTRAVIOLET DISINFECTION ON GROWTH AND SECRETION CHARACTERISTICS OF MICROORGANISM IN RECLAIMED WATER[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(2): 28-34. doi: 10.13205/j.hjgc.202002003

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EFFECT OF ULTRAVIOLET DISINFECTION ON GROWTH AND SECRETION CHARACTERISTICS OF MICROORGANISM IN RECLAIMED WATER

doi: 10.13205/j.hjgc.202002003

1. Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China;
2. Shenzhen Environmental Science and New Energy Technology Engineering Laboratory, Tsinghua-Berkeley Shenzhen Institute, Shenzhen 518055, China

Received Date: 2019-04-04

Abstract

Abstract

Membrane fouling is a prominent problem that hinders the stable and efficient operation of reverse osmosis (RO) system for wastewater reclamation. Previous studies showed that chlorine disinfection, which was commonly used in RO system as the pretreatment could lead to significant change in microbial community structure and secretion characteristics, resulting in serious biofouling. In order to optimize the selection of pretreatment process for RO system in wastewater reclamation, the effect of ultraviolet (UV) disinfection on the growth, community structure and secretion characteristics of microorganism in reclaimed water was investigated. Results showed that when the UV dose was 20, 40 and 80 mJ/cm², the inactivation rate of bacteria reached 1, 3 and 4 log, respectively. The lag period of bacterial growth was prolonged after UV disinfection. The biomass in stable period also decreased by 18.6% and 19.2% compared with the control group, when the UV dose was 40 and 80 mJ/cm². The relative abundance of Proteobacteria phylum, Betaproteobacteria class and Janthinobacterium genus increased at higher UV dose (40, 80 mJ/cm²). In terms of secretion characteristics, the amount of extracellular polymeric substances (EPS) decreased firstly and then increased with the increase of UV dose, and the content of macromolecule substances in them increased after UV disinfection, showing higher potential of RO membrane fouling.
- reverse osmosis,
- ultraviolet disinfection,
- microbial growth,
- community structure,
- secretory characteristics,
- extracellular polymeric substances

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References(38)

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