화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.24, No.2, 87-98, June, 2018
DOI10.7464/ksct.2018.24.2.087  Export Citation
열화학적 방법에 의한 하수 슬러지 소각재에서의 인 회수 기술 동향
Trends of Thermochemical Technology for the Recovery of Phosphorus from Sewage Sludge Ash
전슬기, 신현아, 김동진†
  • 한림대학교 환경생명공학과, 24252 강원도 춘천시 한림대학길 1
Seulki Jeon, Hyuna Shin, and Dong-Jin Kim†
  • Department of Environmental Science and Biotechnology , Hallym University, 1, Hallymdaehakgil, Chuncheon, Gangwon 24252, Korea
E-mail:
초록
인은 모든 생명체 유지에 필수적이며 대체 불가능한 원소로서 비료로 많이 이용되고 있다. 그러나 인 자원은 100년 이내에 고갈될 것으로 예상되고 있다. 슬러지 소각재는 인 함량이 높아 인 회수를 위한 대체 자원으로 알려져 있다. 그러나 소각재는 중금속과 인의 낮은 생물이용 가능성으로 인해 비료로 직접 사용할 수 없다. 염소 공여체를 이용한 열화학적 처리는 소각재의 중금속 함량을 낮추고 인의 생물이용 가능성을 높인다고 알려져 있다. 본 총설은 소각재의 중금속 감소와 생물이용 가능성 향상을 위한 열화학적 처리에 의 한 최신 인 회수 기술과 향후 인 회수를 위한 연구 전략을 세우기 위한 것이다. 그 결과 CaCl2와 MgCl2가 가장 효과적인 염소 공여체이며 반응온도(<1000 ℃) 가 중금속 감소에 가장 중요한 운전 요소였다. 중금속제거율은 원소에 따라 다르다. 열화학적인 슬러지 처리기술은 소각재에서 인 회수를 위한 상업적 응용이 곧 가능해지리라 사료되며 인 고갈에 의한 인류의 지속가능성 위기 극복에 큰 기여를 할 것이다. 향후 비용절감과 에너지 소비를 줄이는 환경친화적 공정 개발이 필요하다.
Phosphorus (P) is an essential and irreplaceable element for all living organisms, and it is widely used as a fertilizer. Unfortunately, it is estimated that phosphate reservoir is depleted within about 100 years. Sewage sludge ash (SSA) is an alternative resource for P recovery because of its high P content. However, SSA cannot be directly used as a fertilizer due to heavy metals in it and low P bioavailability. Thermochemical treatment with Cl donor is known to reduce heavy metal contents and increase P bioavailability of SSA. Literature review on thermochemical technologies of SSA for the reduction of heavy metals and bioavailability enhancement has been carried out to estimate the status of current P recovery technology and to develop strategic future research plan for P recovery. The review showed that CaCl2 and MgCl2 were the most effective Cl donors and reaction temperature (<1000 ℃) was the critical operation condition for the reduction. The removal efficiency depends on the species of heavy metals. Thermochemical technology of SSA for P recovery showed the possibility of commercial application in the near future to overcome the coming crisis of human sustainability by P depletion, but it needs cost effectiveness and more ecofriendly process to reduce energy consumption.
Keywords:Bioavailability;Heavy metals;Phosphorus recovery;Sewage sludge ash;Thermochemical treatment
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