Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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A Study on the Biological Treatment of RO Concentrate Using Aerobic Granular Sludge

호기성 그래뉼 슬러지를 이용한 RO 농축수의 생물학적 처리에 관한 연구

  • Received : 2016.02.01
  • Accepted : 2016.02.23
  • Published : 2016.02.29
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Abstract

The purpose of this study is to efficiently improve biological sequencing batch reactor (SBR) system of high-concentrated nitrate nitrogen in reverse osmosis (RO) concentrates by total dissolved solids (TDS) regulation. Since a laboratory-scale SBR system had been operated, we had analyzed specific denitrification rate (SDNR) and specific oxygen uptake rate (SOUR) for microbial activity in according to various injection concentration of TDS. As a result, higher injection concentration of TDS decreased SDNR, and delayed denitrification within denitrification process. Moreover, the higher injection concentration of TDS was, the lower microbial activity was during operation of laboratory-scale SBR system. Therefore, the regulation of TDS injection concentration is necessary to improve efficiency of nitrate nitrogen in the biological SBR system, and treatment of calcium ion ($Ca^{2+}$) is also specifically focused to remove nitrate nitrogen. Moreover, analytical data of SDNR and SOUR can be the effective kinetic design parameters to application of biological treatment of RO concentrate by aerobic granular sludge (AGS).

본 연구의 목적은 RO 농축수 내 TDS 제어에 따른 고농도 질산성 질소의 효율적인 생물학적 처리에 있다. 실험실 규모의 실험에서는 연속회분식 반응기를 이용하여 연구를 수행하였으며 TDS의 주입조건에 따른 비탈질율, 비산소소비율 분석을 수행하였다. 연구결과, 연속회분식 반응기를 이용한 운전에 따라 탈질 공정 내 고농도 TDS 주입에 따라 탈질 반응이 지연되어 SDNR이 감소하는 것으로 나타났으며 미생물 활성도가 또한 감소하는 것으로 나타났다. 따라서 질산성 질소의 원활한 처리를 위하여 TDS 제어가 수반되어야 하며 특히, $Ca^{2+}$의 중점적인 처리가 필요할 것으로 판단된다. 또한 본 연구를 통하여 도출된 SDNR, SOUR 값은 호기성 그래뉼 슬러지를 이용한 RO 농축수의 생물학적 처리를 위한 공정 설계인자로 활용이 가능할 것으로 판단된다.

Keywords

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