Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Characteristics of Filtration Treatment Using Diatomite Filter Aids for Sewage Water Reuse

하수처리수 재이용을 위한 가압식 규조토 여과의 처리성능평가

  • Lim, Byung Ran (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Kim, Hee Seo (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Go, Yeon Sil (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Kim, Hyun Kab (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Kim, Jong Hak (K-1 EcoTech) ;
  • Lee, Tae Jin (Department of Environmental Engineering, Seoul National University of Science and Technology)
  • 임병란 (서울과학기술대학교 환경공학과) ;
  • 김희서 (서울과학기술대학교 환경공학과) ;
  • 고연실 (서울과학기술대학교 환경공학과) ;
  • 김현갑 (서울과학기술대학교 환경공학과) ;
  • 김종학 ((주)케이원에코텍) ;
  • 이태진 (서울과학기술대학교 환경공학과)
  • Received : 2018.11.16
  • Accepted : 2019.03.28
  • Published : 2019.03.30
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Abstract

The purpose of this study was to investigate treatment characteristics of diatomite filtration, that would allow water recovery from biologically-treated effluent for reuse. Diatomite, Celpure 100, and acid clay were used as filter-aids, with a support filter manufactured from polyethylene (PE), and polypropylene (PP). This pre-coating process using diatomite filter-aids, is used in the filtration range of pressure filters, and has consistently provided high-quality separation. The results showed that variations in average removal efficiency of SS, and T-P from biologically treated effluent by the diatomite-coated PE filter, were approximately 82.2 ~ 88.9 % and 4.8 ~ 21.1 %, respectively. T-P treatment efficiency of the PP filter pre-coated with diatomite and $Celpure^{(R)}100$ at $57.64g/m^2$, was approximately $24{\pm}10%$ and $40{\pm}15%$ on average, respectively. Particle size distribution of secondary effluent varied from 0.05 to $200{\mu}m$, and $d_{50}$ value was $20.76{\mu}m$. The size distribution of particles in the diatomite filtrate ranged from 1.26 to $101.1{\mu}m$ when pre-coated with diatomite filter-aid, at a content of $57.64g/m^2$. Diatomite filter aids, i.e., the particles that form the pre-coating layer, capture very fine particles as well as macromolecules, owing to their complex structure with numerous fine microscopic pores, and surface properties. The filtration process using diatomite and $Celpure^{(R)}100$ as filter aids, has been successfully applied, to recover water from sewage for reuse. The disadvantage of the process, is that the particle size of the filter-aid is spent, because of pressurization.

Keywords

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Fig. 1. Particle size distribution of filter-aid: (a) Diatomite, (b) CelpureⓇ100, (c) Acid clay.

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Fig. 2. Schematic diagram of lab-scale apparatus.

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Fig. 3. Filtration rate of PE filter, with filter-aids at 172.9 g/m2 (Error bars: Standard deviation, p <0.05).

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Fig. 4. Particle size distribution of biologically treated effluent and diatomite filtration. (a) Secondary effluent, (b) Diatomite filtration water

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Fig. 5. Change of COD and T-P concentration with pre-coating filter aids on PP filter (Error bars: Standard deviation, p<0.05).

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Fig. 6. SEM micrographs of diatomite (a) and CelpureⓇ100 filter-aids (b).

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Fig. 7. SEM micrographs of side-view of precoat filters after filtration run. (a) Diatomite filter-aid, (b) CelpureⓇ100 filter-aid

Table 1. Treatment characteristics with pre-coating diatomite amount on PE filter

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