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Analysis of the Characteristics of Bulking Agents Used in Livestock Manure Composting

축산분뇨 퇴비화에 이용되는 수분조절제의 특성 분석

  • Kim, Hyeon-Tae (Department of Bio-Industrial Machinery Engineering. College of Agriculture and Life Science, Gyeongsang National University(Institute of Agriculture & Life Science)) ;
  • Lee, Min-HO (Department of Bio-Industrial Machinery Engineering. College of Agriculture and Life Science, Gyeongsang National University(Institute of Agriculture & Life Science)) ;
  • qasim, Waqas (Department of Bio-Industrial Machinery Engineering. College of Agriculture and Life Science, Gyeongsang National University(Institute of Agriculture & Life Science)) ;
  • Lee, Yong-Jin (Department of Bio-Industrial Machinery Engineering. College of Agriculture and Life Science, Gyeongsang National University(Institute of Agriculture & Life Science)) ;
  • Kim, Won-Joong (BK Environmental construction Co. Ltd.) ;
  • Yoon, Yong-Cheol (Department of Agricultural Engineering. College of Agriculture and Life Science, Gyeongsang National University(Institute of Agriculture & Life Science))
  • 김현태 (경상대학교 농업생명과학대학 생물산업기계공학과(농업생명과학연구원)) ;
  • 이민호 (경상대학교 농업생명과학대학 생물산업기계공학과(농업생명과학연구원)) ;
  • 와카스 카심 (경상대학교 농업생명과학대학 생물산업기계공학과(농업생명과학연구원)) ;
  • 이용진 (경상대학교 농업생명과학대학 생물산업기계공학과(농업생명과학연구원)) ;
  • 김원중 (BK환경종합건설(주)) ;
  • 윤용철 (경상대학교 농업생명과학대학 지역환경기반공학과(농업생명과학연구원))
  • Received : 2018.03.05
  • Accepted : 2018.05.15
  • Published : 2018.12.31

Abstract

This study analyzed the characteristics of 6 recyclable bulking agents which can replace sawdust and rice hulls that are commonly used in livestock manure composting. The content of all the hazardous chemicals found in the bulking agents used in this experiment was between 0.0 and 34.1 ppm, which was noticeably lesser than the maximum content levels of hazardous substances 5.0~900.0 ppm prescribed by the Rural Development Administration(RDA), which means that the bulking agents would be able to replace sawdusts and rice husks. The water content of the bulking agents ranged from a minimum of 12.4% to a maximum of 16.6% in the original state, which was much less than 60%, the optimal moisture content. These results indicate that they would be able to function fully as bulking agents. Their water absorption rate was in the range of minimum 31.9% ~ maximum 600.0%, which showed huge differences among the types of bulking agents. The most appropriate bulking agent in terms of water absorption rate was wood pellets. It was the highest in the wood briquette manufactured by A, which was followed by C and B in the order. The shear strength of the 5 types of bulking agents in the original state was 271.7 N on an average, the highest figure of all, except for the oak briquette whose shear strength could not be measured and the wood pellets in the absorption state. The shear strength in the dry and absorption states then followed, and were 78.0 N and 27.7 N on an average, respectively. The wood briquette of A recorded considerably lower shear strength than that of B and C. Overall, shear strength tended to increase according to lower water absorption rates. Since pine wood chips and oak cuts have relatively greater shear strength even in the absorbing state than the other materials, they will be able to endure some power in the case of stirring with pig droppings.

Acknowledgement

Supported by : 농림수산식품기술기획평가원

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