Characteristics of Wastewater from the Pulp.Paper Industry and its Biological Treatment Technologies

펄프.제지산업(製紙産業) 폐수(廢水)의 특성(特性)과 생물학적(生物學的) 처리기술(處理技術)

  • Abn, Ji-Whan (Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lim, Mi-Hee (Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • 안지환 (한국지질자원연구원 광물자원연구본부 비금속활용연구실) ;
  • 임미희 (한국지질자원연구원 광물자원연구본부 비금속활용연구실)
  • Published : 2009.04.27

Abstract

This paper describes characteristics of pollutants in wastewater from the pulp and paper industry and biological technologies for the wastewater treatment. The wastewater from the pulp and paper industry contains high concentrations of biochemical oxygen demand (BOD) and chemical oxygen demand (COD) and shows high toxicity and strong black-brown color. In particular, organic chlorinated compounds such as dioxins and furans may be formed by the chlorination of lignin in wood chips. Thus the pulp and paper industry is recently trending toward total chlorine-free (TCF) bleaching processes. All biological technologies for pulp and paper wastewater treatment are based on the contact between wastewater and bacteria, which feed on organic materials in the wastewater, thus they reduce BOD concentration in it. Both aerobic and anaerobic treatments were found to be effective for the wastewater treatment. Furthermore, advanced technologies such as fungal application and combined biological-filtration process have been also introduced to the wastewater treatment field. These technologies would be useful for water recycling to reduce water consumption throughout pulp and paper making process.

본고는 펄프 제지산업 폐수에 함유된 오염물질들의 특성과 생물학적 처리기술들에 대해 설명한다. 펄프 제지산업 폐수는 고농도의 생화학적 산소요구량 (BOD)과 화학적 산소요구량 (COD)을 포함하고 높은 독성을 보이며 강한 흑갈색을 띠는 것이 특징이다. 특히, 펄프의 표백공정에서 리그닌의 염소화에 의해 다이옥신, 퓨란과 같은 독성의 유기염소화합물이 형성된다는 것이 알려져있다. 이에 따라 최근 펄프 제지산업은 기존의 표백처리를 무염소공정(TCF)으로 대체하고 있다. 펄프 제지산업 폐수처리에 사용되는 모든 생물학적 기술들은 폐수와 박테리아의 접촉 메커니즘에 기반을 두고 있는데, 이것은 박테리아가 폐수 내 유기물질을 먹이로 이용하여 세포로 전환함으로써 폐수 내 BOD농도를 감소시키는 것이다. 펄프 제지산업 폐수의 생물학적 처리에서 호기성 처리와 혐기성 처리 모두 효과적인 것으로 밝혀졌다. 뿐만 아니라, 최근 곰팡이류를 이용한 생물학적 처리, 생물-응집-여과기법을 혼용한 처리 등도 폐수처리분야에 새롭게 적용되었다. 이러한 기술들로 처리된 폐수를 펄프 제지공정에 재활용함으로써 제조공정의 물소비량을 상당히 감소시킬 수 있다.

Keywords

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