대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제39권5호
  • /
  • Pages.237-245
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  • 2017
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  • 1225-5025(pISSN)
  • /
  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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전북지역 하수처리수 재이용 방안 연구

A Study on Reuse of Reclaimed Water in Jeonbuk Province

  • 조창우 (전라북도보건환경연구원) ;
  • 김진태 (전라북도보건환경연구원) ;
  • 박정제 (전라북도보건환경연구원) ;
  • 송주훈 (전라북도보건환경연구원) ;
  • 이미선 (전라북도보건환경연구원) ;
  • 정주리 (전라북도보건환경연구원) ;
  • 류재웅 (전라북도보건환경연구원)
  • Cho, Changwoo (Public Health Environment Institute of Jeollabuk-do) ;
  • Kim, Jintae (Public Health Environment Institute of Jeollabuk-do) ;
  • Park, Jeongjae (Public Health Environment Institute of Jeollabuk-do) ;
  • Song, Juhoon (Public Health Environment Institute of Jeollabuk-do) ;
  • Lee, Miseon (Public Health Environment Institute of Jeollabuk-do) ;
  • Jeong, Juri (Public Health Environment Institute of Jeollabuk-do) ;
  • Ryou, Jaewoong (Public Health Environment Institute of Jeollabuk-do)
  • 투고 : 2016.07.11
  • 심사 : 2017.03.30
  • 발행 : 2017.05.31
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초록

본 연구는 전라북도 내 하수처리장 방류수를 효율적으로 재이용하기 위해 일일 방류량이 $5,000m^3$ 이상 되는 12개 하수처리장을 대상으로 방류수 수질을 조사하고 처리장 주변 현황을 파악하여 용도별 재이용 가능성을 제안하는데 목적을 두었다. 추가적으로 방류수를 재처리하기 위한 실험실규모의 실험도 수행하였다. 방류수는 7개 용도별 수질기준에 근거하여 중금속 16개 항목을 포함한 총 28개 항목을 수질 분석하였다. 분석결과 부적합 항목은 색도, BOD, TN, SS, 염화물, 전기전도도 등 6개 항목이며, 색도와 TN이 각각 8개소, 5개소로 가장 높았다. 유입원수가 공단폐수 및 음식물처리수가 유입되는 처리장의 경우 염화물과 전기전도도가 높았다. 방류수 재처리없이 직접 재이용수로 가능한 처리장은 4개소였다. 실험실 규모의 실험(Lab test)은 모래여과(SF)-활성탄흡착(GAC)-정밀여과(MF)-역삼투압(RO) 순으로 실험을 수행하였다. 총대장균군, 색도, 부유물질(SS) 제거는 SF와 GAC조합이 경제성과 처리 효율면에서 가장 적절하였으며, 염화물과 전기전도도는 SF, GAC, MF에서는 큰 효과가 없었으며, RO처리 후 90% 이상의 제거효율을 보였다. $UV_{254}$는 원수가 0.3651/cm에서 SF-GAC공정 후 0.0306/cm로 92% 이상의 높은 제거효율을 보였다. 중금속 중 총붕소(B-total)는 SF-GAC-MF-RO 처리 후 0.7054 mg/L에서 0.0854 mg/L로 88% 제거효율을 보였다. 결론적으로 각 처리장은 방류수 수질분석결과와 주변 지형을 고려하여 방류수 재이용 용도를 선택하여야 한다. 또한 재처리가 필요한 경우 처리할 수질 항목과 처리비용을 고려한 처리방법을 결정하는 것이 적절하다고 판단된다.

This study was aimed at investigating effluent water quality and proposing reuse possibilities for 12 sewage treatment plants discharged more than $5,000m^3/day$ in order to recycle the sewage treatment plant effluent of Jeollabuk-do effectively. Additionally, a laboratory scale test for reprocessing water discharge was performed. Categories of reclaimed sewage water reuse were divided into 7 topics and analyzed a total of 28 items including 16 heavy metals based on water quality standard. As a results, color, BOD, TN, chloride and Electrical Conductivity (EC) exceeded reused water quality standard. In particular, color and TN exceeded in 8 and 5 sewage treatment plants, respectively. The value of chloride and EC were high in sewage treatment plants including the food and industrial wastewater. At 4 sewage treatment plants were possible to reuse without re-treatment. The laboratory scale test was conducted to SandFilter (SF)-Granular Activated Carbon (GAC)-MicroFiltraion (MF)-Reverse Osmosis (RO). Both the removal efficiencies and economic feasibility of total E. coli., color and Suspended Solid (SS) suited in case using the SF-GAC treatment method. The removal of chloride and EC had little effect in the case of SF-GAC-MF system, but RO showed over 90% of removal efficiency. After using SF-GAC process only, the concentration of $UV_{254}$ decreased sharply from 0.3651 /cm to 0.0306 /cm and it showed over 92% of removal efficiency rate. In conclusion, for the effective reuse of sewage discharged water, water quality and the surrounding terrain of treatment plants should be all taken into account. If it needed for the reprocessing, both the selection for treatment and economic combination treatment methods will have to be considered.

키워드

참고문헌

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