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2024 Vol.26, Issue 2

Research article

The effect of livestock manure composting on the degradation of polylactic acid (PLA)

축분 퇴비화가 polylactic acid (PLA) 분해에 미치는 영향

Yan-Qing Wang1
,
Jae-Hyeong Shin2
,
Ji-Yun Hwang3
,
Soo-Ki Kim4*
왕 옌칭1
,
신 재형2
,
황 지윤3
,
김 수기4*
1Master’s Student, Department of Animal Science and Technology, Konkuk University, 120 Neungdong-ro, Seoul, 05029, Republic of Korea
2Academic Research Professor, Department of Animal Science and Technology, Konkuk University, 120 Neungdong-ro, Seoul, 05029, Republic of Korea
3Undergraduate Student, Department of Animal Science and Technology, Konkuk University, 120 Neungdong-ro, Seoul, 05029, Republic of Korea
4Professor, Department of Animal Science and Technology, Konkuk University, 120 Neungdong-ro, Seoul, 05029, Republic of Korea
1건국대학교 동물자원과학과 석사과정생
2건국대학교 동물자원과학과 학술연구교수
3건국대학교 동물자원과학과 학부생
4건국대학교 동물자원과학과 교수
*Corresponding Author
30 August 2024. pp. 57-66
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Abstract

This study focused on expanding the environmentally friendly applications of livestock manure by investigating the condition of compost piles when polylactic acid (PLA), a biodegradable plastic material, is used in the composting process. Livestock manure has long been used for organic fertilizer and soil improvement, and recently, biodegradable plastics like PLA, which decompose efficiently in high-temperature environments, have noted as a place where environmental benefits will arise. When shredded PLA particles were added at approximately 8% by volume (23%/dry matter) to a 2.5-ton livestock manure mixture, the compost piles did not show decreased heating compared to the control pile without PLA. However, the treatment pile with PLA particles exhibited higher levels of odorous gases such as ammonia. The total microbial count per gram was slightly higher or significantly higher (p<0.05) in the treatment pile compared to the control pile. The rate of PLA particle degradation was assessed by counting the number of particles, showing a 44.1% reduction after 30 days and a 73% reduction by the end of the 100-day trial. This study examined the impact of PLA on livestock manure composting at a field level and suggests the need for further research on unexplored factors, as well as the possibility of environmental benefits of using PLA as a composting material.

Keywords
Livestock manure
Compost
PLA
Biodegradation
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Information
  • Publisher :The Korean Society of Animal Environmental Science & Technology
  • Publisher(Ko) :(사)한국축산환경학회
  • Journal Title :Journal of Animal Environmental Science
  • Journal Title(Ko) :축산시설환경학회지
  • Volume : 26
  • No :2
  • Pages :57-66
  • Received Date : 2024-08-12
  • Revised Date : 2024-08-22
  • Accepted Date : 2024-08-26
  • DOI :https://doi.org/10.11109/JAES.2024.26.2.057
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