Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Treatment of Secondary Municipal Wastewater by Submerged Hollow Fiber MF Membranes for Water Reuse

침지형 MF 중공사막을 이용한 하수 2차 처리수의 재이용 연구

  • Received : 2004.10.21
  • Accepted : 2005.02.01
  • Published : 2005.02.15
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Abstract

This study was conducted to evaluate the performance of submerged hollow fiber MF processes to treat secondary wastewater for water reuse. Specifically, membrane productivity and filtrate water quality were investigated under various operating conditions (i.e. flux, recovery, and backwash rate) at pilot-scale. Membrane fouling became more severe with increasing flux and recovery, suggesting that low flux operation (< 25 LMH) was desirable. At high flux operating(> 37.5 LMH), increasing backwash rate showed only limited success. The biofouling, quantified by PEPA and BFHPC, was also significant in wastewater reclamation, and biogrowth control by chlorine, were necessary to improve membrane productivity. Filtrate water qualities are in good compliance with water reuse regulations regardless of operating conditions (flux, recovery and backwash rate). Particle (e.g. turbidity) removal ranged from 89 to 98%, while only 11 to 21% of organics (e.g. NPDOC) were removed by MF membrane. Only small improvement in biostability (e.g. AOC) was achieved by MF system, and thus, without post disinfection, significant microorganisms might be present in the filtrate due to regrowth. Lastly, in order to further investigate pathogen removal, controlled microbial challenge tests were performed by monitoring Giardia, Cryptosporidium, bacteria and virus, and showed relatively good microbial removal.

Keywords

Acknowledgement

Supported by : 광주과학기술원

References

  1. Angelakis, Bontoux (2001) 'Wastewater reclamation and reuse in Eureau countries', Water Policy, 3, pp. 47-59 https://doi.org/10.1016/S1366-7017(00)00028-3
  2. Asano, Levin (1996) 'Wastewater reclamation, recycling and reuse: past, present, and future', Water Science Technology, 33(10-1l), pp.1-4
  3. Escobar, S. Hong, A. Randall (2000) 'Removal of Assimilable Organic Carbon (AOC) and Biodegradable Dissolved Organic Carbon (BDOC) by Reverse Osmosis and Nanofiltration Membranes', Journal of Membrane Science, 175, pp.1-17 https://doi.org/10.1016/S0376-7388(00)00398-7
  4. Fox (2001) 'Development of Water Resources Through Water Reuse: Challenges for The Future', Editorial in Journal of Environmental Engineering, pp. 865-866
  5. Freeman (2002) 'A Clear Advantage: Membrane filtration is gaining acceptance in the water quality field', Article in Water Environment and Technology, January 2002: pp. 16-21
  6. Ghayeni (1998) 'Water reclamation from municipal wastewater using combined microfiltration-reverse osmosis (ME-RO): Preliminary performance data and microbiological aspects of system operation', Desalination, 116(1): pp. 65-80 https://doi.org/10.1016/S0011-9164(98)00058-7
  7. J. Decarolis, S. Hong, J. Taylor (2001) 'Fouling Behavior of a Pilot Scale Inside Out Hollow Fiber UF Membrane During Dead-end Filtration of Tertiary Wastewater', Journal of Membrane Science, 191, pp. 165-178 https://doi.org/10.1016/S0376-7388(01)00455-0
  8. Tehobanoglous (1998) 'Ultrafiltration as an advanced tertiary treatment process for municipal wastewater', Desalination, 119(1-3), pp. 315-321 https://doi.org/10.1016/S0011-9164(98)00175-1