Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
권호 표지

Biological Wastewater Treatment Using Submerged Nonwoven Fabric Separation

침적식 부직포 막분리를 이용한 생물학적 폐수처리

  • Choi, Hyoung-Sub (Water Quality preservation Division, provincial Government Institute of Health and Environment) ;
  • Moon, Byung-Hyun (Department of Environmental Engineering, College of Engineering, Chang-Won National University) ;
  • Heo, Jong-Soo (Department of Agricultural Chemistry, College of Agriculture, Gyeongsang National University) ;
  • Lee, Hong-Jae (Department of Agricultural Chemistry, College of Agriculture, Gyeongsang National University)
  • 최형섭 (경상남도보건환경연구원) ;
  • 문병현 (창원대학교 공과대학 환경공학과) ;
  • 허종수 (경상대학교 농과대학 농화학과) ;
  • 이홍재 (경상대학교 농과대학 농화학과)
  • Published : 1997.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

The combination of biological wastewater treatment process and membrane separation has many advantages such as better effluent quality and system stability over the conventional biological wastewater treatment process. In this study, direct membrane separation using nonwoven fabric was applied to biological wastewater treatment. A nonwoven fabric module was submerged in the aerated bioreactor. And accumulated biomass in the bioreactor was separated by suction. The system was operated with various condition to investigate pollutant removal efficiencies and flux. After formation of biomass layer on nonwoven fabric surface, a day, the stable effluent water quality was obtained. The flux decreased at a high suction pressure faster than a low pressure. The stable flux was obtained at the pressure of $21{\sim}25cmHg$. In spite of variation of hydraulic retention time, organic loading rate, the removal efficiencies of BOD, $COD_{Cr}$. $COD_{Mn}$ were very high as follows : $95.2%(0.14{\sim}0.97\;BODKg/m^3/day)$, $86.0%(0.17{\sim}1.39\;COD_{Cr}Kg/m^3/day)$, $90.0%(0.097{\sim}0.61\;COD_{Mn}Kg/m^3/day)$.

침적식 부직포 막분리와 생물학적처리를 조립한 본 연구시스템을 합성폐수에 적용 실험한 결과 다음과 같은 결론을 얻을 수 있었다. 1. 부직포는 기존 여과막보다 공극이 크므로 부직포 모율을 하루정도 침적한 후 생물여과막이 형성된 후 처리수가 안정됨으로 장치의 설치후 하루이상 경과한 후 가동되어야 한다. 2. 수리학적 체류시간, 부하량등의 변화에도 유기물 제거율은 평균 $COD_{Cr}$ 86.0%, $COD_{Cr}$ 90.0%, BOD 95.2%를 나타내었으며, 유출수 SS은 평균 6.2mg/l이었다. 3. 플럭스는 운전 초기 및 높은 압력에서 감소율이 크게 나타났으며 흡입압 $21{\sim}25cmHg$(약 30kpa)에서 $0.124m^3/m^2day$로 안정되었다. 4. 본 시스템의 단위체적당 처리량을 증가시키기 위한 적정한 부직포막의 선정 및 막면의 증가와 부직포 표면의 생물여과막의 조절을 위한 계속적인 연구가 필요하다고 사료된다.

Keywords