Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Application of coagulation pretreatment for enhancing the performance of ceramic membrane filtration

세라믹 막여과의 성능향상을 위한 응집 전처리의 적용

  • Kang, Joon-Seok (Department of Environmental Engineering and Energy, Myongji University) ;
  • Song, Jiyoung (Department of Environmental Engineering and Energy, Myongji University) ;
  • Park, Seogyeong (Department of Environmental Engineering and Energy, Myongji University) ;
  • Jeong, Ahyoung (Department of Environmental Engineering and Energy, Myongji University) ;
  • Lee, Jeong-Jun (Department of Environmental Engineering and Energy, Myongji University) ;
  • Seo, Inseok (Water Supply Resurch Center, K-water Institute) ;
  • Chae, Seonha (Water Supply Resurch Center, K-water Institute) ;
  • Kim, Seongsu (Water Supply Resurch Center, K-water Institute) ;
  • Kim, Han-Seung (Department of Environmental Engineering and Energy, Myongji University)
  • 강준석 (명지대학교 환경에너지공학과) ;
  • 송지영 (명지대학교 환경에너지공학과) ;
  • 박서경 (명지대학교 환경에너지공학과) ;
  • 정아영 (명지대학교 환경에너지공학과) ;
  • 이정준 (명지대학교 환경에너지공학과) ;
  • 서인석 (K-water 연구원 스마트워터연구소) ;
  • 채선하 (K-water 연구원 스마트워터연구소) ;
  • 김성수 (K-water 연구원 스마트워터연구소) ;
  • 김한승 (명지대학교 환경에너지공학과)
  • Received : 2017.07.10
  • Accepted : 2017.11.10
  • Published : 2017.12.15
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Abstract

In this study, it is estimated that ceramic membrane process which can operate stably in harsh conditions replacing existing organic membrane connected with coagulation, sedimentation etc.. Jar-test was conducted by using artificial raw water containing kaolin and humic acid. It was observed that coagulant (A-PAC, 10.6%) 4mg/l is the optimal dose. As a results of evaluation of membrane single filtration process (A), coagulation-membrane filtration process (B) and coagulation-sedimentation-membrane filtration process (C), TMP variation is stable regardless of in Flux $2m^3/m^2{\cdot}day$. But in Flux $5m^3/m^2{\cdot}day$, it show change of 1-89.3 kpa by process. TMP of process (B) and (C) is increased 11.8, 0.6 kpa each. But, the (A) showed the greatest change of TMP. When evaluate (A) and (C) in Flux $10m^3/m^2{\cdot}day$, TMP of (A) stopped operation being exceeded 120 kpa in 20 minutes. On the other hand, TMP of (C) is increased only 3 kpa in 120 minutes. Through this, membrane filtration process can be operated stably by using the linkage between the pretreatment process and the ceramic membrane filtration process. Turbidity of treated water remained under 0.1 NTU regardless of flux condition and DOC and $UV_{254}$ showed a removal rate of 65-85%, 95% more each at process connected with pretreatment. Physical cleaning was carried out using water and air of 500kpa to show the recovery of pollutants formed on membrane surface by filtration. In (A) process, TMP has increased rapidly and decreased the recovery by physical cleaning as the flux rises. This means that contamination on membrane surface is irreversible fouling difficult to recover by using physical cleaning. Process (B) and (C) are observed high recovery rate of 60% more in high flux and especially recovery rate of process (B) is the highest at 95.8%. This can be judged that the coagulation flocs in the raw water formed cake layer with irreversible fouling and are favorable to physical cleaning. As a result of estimation, observe that ceramic membrane filtration connected with pretreatment improves efficiency of filtration and recovery rate of physical cleaning. And ceramic membrane which is possible to operate in the higher flux than organic membrane can be reduce the area of water purification facilities and secure a stable quantity of water by connecting the ceramic membrane with pretreatment process.

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References

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