We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Temporal succession and spatial heterogeneity of humification, pathogens and bacterial community in facultative heap composting.
- Authors
Yang, Yan; Kong, Yilin; Wang, Guoying; Shen, Yujun; Tang, Ruolan; Yin, Ziming; Yang, Jia; Li, Guoxue; Yuan, Jing
- Abstract
The oxygen (O 2) content of heap composting pile gradually decreased with depth, mainly because of limitations to air diffusion. Owing to uneven distribution of O 2 , composting was aerobic in upper layer, facultatively anaerobic in middle layer, and anaerobic fermentation occurred in bottom layer. Therefore, this study investigated temporal succession and spatial heterogeneity of humification, pathogens and bacterial community in facultative heap composting. In this study, pig manure alone or mixed with cornstalk was composted for 90 days without ventilation or turning. Different compost layers exhibited discrepancies in maturity and bacterial community due to differences in air diffusion during heap composting. From the compost pile's upper to lower levels, the maturity of both treatments decreased from 80.60% to 0%, and the Shannon index decreased from 4.09 to 2.08. Cornstalk regulation significantly improved compost maturity and humification, brought obvious improvements to bacterial diversity and cooperative interactions and accelerated transformation from anaerobic to aerobic bacteria by enhancing porosity and oxygen diffusion. Cornstalk addition would slow the rate of pathogen reduction but could inactivate more thoroughly. The structural equation model revealed oxygen content, temperature and bacterial community mainly influenced pathogen inactivation, and key factors affecting humification were dissolved organic carbon and bacterial community. [Display omitted]
- Subjects
COMPOSTING; HUMIFICATION; BACTERIAL communities; STRUCTURAL equation modeling; BACTERIAL diversity; AEROBIC bacteria; HETEROGENEITY
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2023, Vol 176, p734
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2023.06.049