한국환경농학회지 (Korean Journal of Environmental Agriculture)

  • 제26권2호
  • /
  • Pages.124-130
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  • 2007
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  • 1225-3537(pISSN)
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  • 2233-4173(eISSN)
한국환경농학회 (The Korean Society of Environmental Agriculture)
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제지슬러지에 대한 alum 처리 및 퇴비화에 따른 인 흡착능 변화

Estimation of Phosphorus Adsorption Capacity of Alum-amended and Composted Paper Mill Sludge

  • 이인복 (농촌진흥청 원예연구소 원예토양관리팀) ;
  • 장기운 (충남대학교 농업생명과학대학) ;
  • 박진면 (농촌진흥청 원예연구소 원예토양관리팀)
  • Lee, In-Bog (Hort. Soil Management Team, National Horticultural Research Institute, RDA) ;
  • Chang, Ki-Woon (Dept. of Bio Environment Chemistry, Chungnam Nat'l Univ.) ;
  • Park, Jin-Myeon (Hort. Soil Management Team, National Horticultural Research Institute, RDA)
  • 발행 : 2007.06.30
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초록

제지슬러지(PMS)는 침전과정에서 alum을 사용함으로 인해 다량의 알루미늄을 함유하며, 그 결과 토양 시용시 종종 작물에 대한 인의 흡수를 제한하는 요인으로 작용한다. 본 연구는 그러한 제지슬러지의 인 흡착 특성을 조사하기 위하여 토양을 대조로 하여 alum을 처리하기 전과 후에 채취한 제지 슬러지 및 제지슬러지 퇴비(PMSC)를 대상으로 인 최대 흡착$(X_m)$과 흡착에너지 상수 $K_f$를 조사하였다. 토양의 인 최대흡착량은 800 ${\mu}g\;g^{-1}$인 반면, alum 처리 전 PMS는 47 $mg\;g^{-1}$, alum처리 후 PMS는 61 $mg\;g^{-1}$으로서 대조 토양에 비해 PMS의 인 흡착량은 현저하게 높고, alum 처리 후 인흡착능은 약 30% 증가하였다. 또한 퇴비화 후 PMS 퇴비의 최대 인 흡착능은68 $mg\;g^{-1}$으로서 퇴비화로 인하여 약 11%의 인 흡착능이 증가하였다. 인 흡착 계수인 $K_f$는 alum 처리 유무 간 큰 차이가 없었으나 퇴비화후에는 크게 증가하는 것으로 나타났다. 인 최대 흡착량$(X_m)$과 흡착에너지 상수 $K_f$를 고려한 이러한 결과들은 제지슬러지의 퇴비의 장기 혹은 과량시용이 작물에 대한 인의 흡수를 제한하는 요인으로 작용할 수 있음을 암시한다.

Excess application of paper mill sludge (PMS) in field can limit phosphorus uptake by crops because aluminum presented in the sludge can fix or adsorb available phosphorus which is necessary for crop growth. To investigate phosphorus (P) adsorption characteristics of PMS, we examined P adsorption maximum $(X_m)$ using Langmuir isotherm and P adsorption energy constant $(K_f)$ using Freundlich isotherm for PMS without alum, PMS with alum, and composted PMS with alum through a laboratory incubation test. The maximum P adsorption capacities were 800 ${\mu}g\;g^{-1}$ in soil, 47 $mg\;g^{-1}$ in PMS without alum and 61 $mg\;g^{-1}$ in PMS with alum. P adsorption capacity with alum treatment for PMS increased by 30%. That of PMS compost was 68 $mg\;g^{-1}$ and showed that composting increases 11% of P adsorption. Freundlich constant $K_f$ was 22 in check soil, while $K_f$ values in PMS without alum and in PMS with alum were 398 and 426, respectively. After composting, $K_f$ value of PMS compost significantly increased as 1,819. In conclusions, p adsorption capacity for PMS were increased by alum treatment or composting and therefore excess or continuous land application of alum-amended or composted PMS can limit P uptake for crops by reducing available P in sell.

키워드

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