Membrane and Water Treatment

  • 제3권4호
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  • Pages.221-230
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  • 2012
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Use of laminar flow water storage tank (LFWS) to mitigate the membrane fouling for reuse of wastewater from wafer processes

  • Sun, Darren Delai (School of Civil and Environmental Engineering, Nanyang Technological University) ;
  • Wu, You (School of Civil and Environmental Engineering, Nanyang Technological University)
  • 투고 : 2012.07.24
  • 심사 : 2012.09.27
  • 발행 : 2012.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study employed the modified fouling index (MFI) to determine the performance of a two-step recycling system - a membrane filtration integrated laminar flow water storage (LFWS) tank followed by an ion exchange process to reclaim ultrapure water (UPW) from the wastewater generated from semiconductor wafer backgrinding and sawing processes. The first step consisted of the utilization of either ultrafiltration (UF) or nanofiltration (NF) membranes to remove solids in the wastewater where the second step consisted of an ion exchanger to further purify the filtrate. The system was able to produce high purity water in a continuous operating mode. However, higher recycling cost could be incurred due to membrane fouling. The feed wastewater used for this study contained high concentration of fine particles with low organic and ionic contents, hence membrane fouling was mainly attributed to particulate deposition and cake formation. Based on the MFI results, a LFWS tank that was equipped with a turbulence reducer with a pair of auto-valves was developed and found effective in minimizing fouling by discharging concentrated wastewater prior to any membrane filtration. By comparing flux behaviors of the improved system with the conventional system, the former maintained a high flux than the latter at the end of the experiment.

키워드

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피인용 문헌

  1. Comparison study on membrane fouling by various sludge fractions with long solid retention time in membrane bioreactor vol.4, pp.3, 2013, https://doi.org/10.12989/mwt.2013.04.3.175
  2. Surface modification of PVDF ultrafiltration membranes by remote argon/methane gas mixture plasma for fouling reduction vol.45, pp.5, 2014, https://doi.org/10.1016/j.jtice.2014.06.025