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Changes of Compost Quality by the Formation of Struvite Crystal During the Composting of Swine Manure

돈분뇨 부숙과정에서 Struvite 결정체 형성에 따른 퇴비특성 변화

  • Lee, Jin-Eui (Division of Animal Life System, College of Animal Life Science, Kangwon National University) ;
  • Ra, Chang-Six (Division of Animal Life System, College of Animal Life Science, Kangwon National University)
  • 이진의 (강원대학교 동물생명과학대학) ;
  • 라창식 (강원대학교 동물생명과학대학)
  • Received : 2009.05.06
  • Accepted : 2009.06.01
  • Published : 2009.06.01

Abstract

The effect of Mg supplement on the composting of swine manure and the formation of $MgNH_4PO_46H_2O$ (MAP) crystal during composting were examined. Mg source was added at a rate of 1.2 molar ratios to soluble phosphate ($PO_4$) level in swine manure. The temperature profiles and final compost qualities revealed that the Mg source addition didn't retard the decomposition of organic matters. As the added Mg reacted with $NH_4$ and $PO_4$ in manure, creating MAP crystal, the $NH_4$ level was reduced, and this was resulted in low nitrogen lose during the composting. The phosphate level was also decreased with the addition of Mg source, and hence the ratio of orthophosphate to total phosphate (OP/TP) in the final compost was lowered. Therefore, it was assured that supplement of Mg source into the composting materials could enhance the quality of compost by preserving nourishment and converting it into a slowly releasing fertilizer. X-Ray diffraction examination of the final compost showed that a distinct MAP crystal was formed during the composting, and the crystal mainly existed with the compost particle size less than 2.8 mm and over 2/3 of nourishment of the final compost was found in those particles.

Keywords

Swine manure;Composting;MAP;Slowly releasing fertilizer

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