Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Extraction of nitrate salts from de-NOx waste scrubbing solution

탈질 스크러버의 폐세정액으로부터 질산염 추출 연구

  • Kim, Wooram (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Ha, Taeyoung (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Park, Yeonsoo (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Lee, Hyunsuk (F-tech Corp.) ;
  • Jo, Youngmin (Department of Environmental Science and Engineering, Kyung Hee University)
  • Received : 2017.04.13
  • Accepted : 2017.06.12
  • Published : 2017.06.30
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Abstract

Recovery of low level nitric acid and sulfuric acid ions, which were contained in wastewater of a wet scrubber for de-NOx and de-SOx from ship engines, was attempted as fertilizing materials. This study utilized a selective extraction method using four organic solvents to precipitate the solid salts of ammonium nitrate and ammonium sulfate. The IR analysis showed almost same composition of the extracted ammonium salts with a commercial product, and recovery rate of nitrogen and sulfuric ions was 89% and 80% respectively. It was found that the selectivity and solubility consequently could be the crucial factors to recover the low level ions from the waste scrubbing water.

선박엔진에서 발생하는 NOx 및 SOx 제거용 스크러버 폐세정액에 포함되어 있는 저농도상의 질산 및 황산이온을 비료상 물질로 회수하고자 하였다. 본 연구에서는 네 가지 유기용매를 적용하여 선택적으로 추출하여 회수하는 방법을 시험하였다. 아세톤과 메틸알콜을 이용하여 추출한 질산암모늄과 디에틸에테르와 에틸알콜을 적용한 황산암모늄의 시료를 적외석흡수분광법(IR)을 이용하여 분석한 결과, 상용제품과 거의 동일한 구성성분으로 나타났다. 이때 폐수로부터의 회수율은 최대 89%와 80%까지 각각 얻을 수 있었다. 따라서 배기가스 스크러버에 잔존해있는 질산이온과 황산이온에 대한 회수는 사용하는 용매의 선택도 및 용해도가 핵심적인 요소인 것으로 판단된다.

Keywords

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