Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Effect of pH Adjustment by Adding Sulphuric Acid on Chemical Properties in Aerobic Liquefying Process of Co-Digestate of Swine Manure and Apple Pomace

돈분과 사과착즙박의 혼합 혐기소화액의 황산첨가 pH 조절이 호기성 액비화과정에서의 화학적 특성 변화

  • Ryoo, Jong-Won (Deparment of Life and Environment Science, Sangji University)
  • 류종원 (상지대학교 생명환경과학대학)
  • Received : 2020.06.07
  • Accepted : 2020.08.18
  • Published : 2020.09.30
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Abstract

This study aims to survey the effect of sulphuric acid (H2SO4) treatment for pH adjustment with 6.5 and 7.0 regarding ammonia volatilization on chemical content change in the aerobic liquefying process of co-digesate swine manure and apple pomace. The digestates of swine manure was aerated with 0.3 ㎥ air/㎥·min for 60 days. The untreated digestate showed the increased pH and decreased contents of electrical conductivity (EC) and total nitrogen (T-N). The untreated digestate had a high concentration of NH3 with 172.6 mg/L, but, ammonia (NH3) concentration of H2SO4-treated digestate was significantly lower than that of untreated digestate. The H2SO4-untreated digestate for retaining aeration showed a decreased concentration of 47.2% of ammonium nitrogen. While, the H2SO4-treated digestate had a high concentration of ammonium nitrogen compared to the untreated digestate. Also, the H2SO4 treatment affected to increase the contents of nitrogen and phosphoric acid content. Therefore, the pH adjustment with H2SO4 might be a useful method for the decreased ammonia concentration and nitrogen maintenance in the aerobic liquefying process of swine manure digesate.

본 연구는 돈분과 사과착즙박 혼합 혐기소화액의 호기성 처리 과정에서 황산(H2SO4)을 이용한 혐기소화액의 pH를 7.0과 6.5 조절 처리가 암모니아 휘발과 화학적 특성 변화에 미치는 영향을 구명하기 위하여 수행하였다. 혐기소화액은 0.3 ㎥ air/㎥·min 조건에서 60일 동안 폭기처리를 실시하였다. 무처리구의 혐기소화액은 호기성 액비화 과정 중 pH가 상승하고, EC와 T-N 함량이 감소하는 경향을 나타내었다. 황산 무처리 혐기소화액은 pH가 높아 액비화 과정에 암모니아 농도가 172.6 mg/L로 높았으나 황산 처리 pH 조절 혐기소화액은 암모니아(NH3) 발생이 유의적으로 감소되었다. 황산 무처리 혐기소화액은 액비화 과정 중 암모늄태 질소 함량이 47.2% 감소되었다. 혐기소화액의 pH 조절 처리구는 암모늄태 질소의 함량이 황산 처리 pH 조절 처리구에 비하여 높았다. 또한, 황산(H2SO4)처리는 혐기소화액에서 질소, 인산 함량의 증가에 영향을 주어 비료 성분이 높아지는 효과를 나타내었다. 따라서 혐기소화액의 황산 첨가에 의한 pH 조절은 호기성 액비화 공정에서 암모니아 휘산 저감과 질소 함량을 높이기 위한 유용한 방법으로 활용될 수 있을 것이다.

Keywords

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