Aggravated biofouling caused by chlorine disinfection in a pilot-scale reverse osmosis treatment system of municipal wastewater
Autor: | Yin-Hu Wu, Xin Tong, Yuan Bai, Hao-Bin Wang, Li-Wei Luo, Nozomu Ikuno, Gen-Qiang Chen, Yun-Hong Wang, Hong-Ying Hu |
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Rok vydání: | 2021 |
Předmět: |
Treatment system
wastewater reclamation Waste management Chemistry 0208 environmental biotechnology Pilot scale chemistry.chemical_element Filtration and Separation 02 engineering and technology 010501 environmental sciences Environmental technology. Sanitary engineering 01 natural sciences 020801 environmental engineering Biofouling reverse osmosis Wastewater biofouling chlorine disinfection chlorine-resistant bacteria (crb) polycyclic compounds Chlorine Reverse osmosis TD1-1066 0105 earth and related environmental sciences Water Science and Technology |
Zdroj: | Water Reuse, Vol 11, Iss 2, Pp 201-211 (2021) |
ISSN: | 2408-9370 2220-1319 |
Popis: | The reverse osmosis (RO) system is widely applied to produce reclaimed water for high-standard industrial use. Chlorine disinfection is the main biofouling control method in the RO systems for wastewater reclamation. However, researchers reported the adverse effects of chlorine disinfection which aggravated biofouling in laboratory-scale RO systems. In this study, four parallel 4-inch spiral wound RO membranes were used to study the effect of chlorine on biofouling in a pilot-scale RO system. The free chlorine dosages in four experimental groups were 0, 1, 2 and 5 mg/L, respectively. After continuous chlorination and dechlorination, the feed water entered the RO system. It was found that chlorine pretreatment caused a 1.9–36.7% increase in relative feed water pressure of the RO system, suggesting that chlorine aggravated the membrane fouling in the pilot-scale RO system. The microbial community structures of living bacteria in the feed water of the RO system were determined by the PMA (propidium monoazide)-PCR method and showed that the relative abundance of chlorine-resistant bacteria (CRB) was significantly increased after disinfection. Nine major genera which maintained higher relative abundance in experimental groups with high chlorine dosage were considered as possible key species causing membrane fouling, including Pedobacter, Clostridium and Bradyrhizobium. HIGHLIGHTS Revealed the effects of chlorine disinfection on fouling of a pilot-scale RO system.; Chlorine disinfection aggravated the membrane fouling in the pilot RO system.; Analyzed community structure of residual bacteria after disinfection in feed water.; Identified key chlorine-resistant bacteria (CRB) causing RO membrane fouling. |
Databáze: | OpenAIRE |
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