대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제35권3호
  • /
  • Pages.226-232
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  • 2013
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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금속산업폐수의 재이용을 위한 물리화학적 전처리공정의 유기물 및 무기물제거 특성 평가

Evaluation of Organics and Inorganics Removal of Physicochemical Pretreatment Processes for Reuse of Metal Industry Wastewater

  • 하동환 (영남대학교 환경공학과) ;
  • 정진영 (영남대학교 환경공학과)
  • Ha, Dong-Hwan (Department of Environmental Engineering, Yeungnam University) ;
  • Jung, Jin-Young (Department of Environmental Engineering, Yeungnam University)
  • 투고 : 2013.02.11
  • 심사 : 2013.03.15
  • 발행 : 2013.03.30
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초록

역삼투기반 금속산업폐수 물재이용시스템의 전처리공정을 선정하기 위해 연수화, 응집침전, 활성탄, 이온교환 및 중화 침전공정에 대한 무기물 및 유기물 제거특성을 조사하였다. 유기물제거를 위해 DOC중 친수성 및 소수성 유기물을 분류하였으며, 이를 이용하여 조합공정을 최적화하였다. 다양한 전처리공정 중에서 연수화는 금속산업 방류수에 존재하는 칼슘경도(1,201 mg/L as $CaCO_3$)를 93.4%제거함과 동시에 소수성유기물을 모두 제거하는 것으로 나타났다. 연수화 후에 응집침전공정을 연계할 경우, 방류수에 포함된 유기물 5.1 mg DOC/L을 1.6 mg DOC/L까지 저감할 수 있었다. 또한, 금속공정 원폐수를 대상으로 가성소다를 이용한 중화침전공정을 적용하였을 때, 수중경도를 유발하지 않으면서도 철과 총용존성고형물을 효과적으로 제거할 수 있는 것으로 나타났다.

Several pretreatment processes such as softening, coagulation and precipitation, activated carbon adsorption, ion-exchange and neutralization processes were studied to remove organics and inorganics for selection of the RO based reusing system of metal industry wastewater. The effects of the hydrophobic/hydrophilic fractions of the organics on DOC removal were tested and used to optimize the combination process. Among various pretreatment processes, softening could reduce 93.4% of hardness and could remove all hydrophobic organics from the effluent of metal industry wastewater. Softening followed by coagulation process could reduce DOC (Dissolved Organic Carbon) from 5.1 mg/L to 1.6 mg/L. In addition, as a result of physiochemical pretreatment to raw wastewater of metal industry, neutralization with NaOH showed an efficient removal of iron and TDS (Total Dissolved Solids) without increase in the hardness.

키워드

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피인용 문헌

  1. Study on Discharge Characteristics of Water Pollutants among Industrial Wastewater per Industrial Classification and the Probability Evaluation vol.38, pp.1, 2016, https://doi.org/10.4491/KSEE.2016.38.1.14