Abstract
Agricultural operations generate large quantities of manure which must be eliminated in a manner that is consistent with public health guidelines. Meanwhile, construction and demolition waste makes up about 25% of total solid municipal waste. Co-composting of manure with construction and demolition waste offers a potential means to make manure safe for soil amendment and also divert construction and demolition waste from municipal landfills. Therefore, the archaeal, bacterial, and fungal microbiota of two different types of composted cattle manure and one co-composted with construction and demolition waste, were assessed over a 99-day composting period. The microbiota of the three compost mixtures did not differ, but significant changes over time and by sampling depth were observed. Bacillus and Halocella, however, were more relatively abundant in composted manure from cattle fed dried distillers’ grains and solubles. Proteobacteria and Bacteroidetes were enriched at day 0 and Firmicutes at day 99. The fungal genus Kernia was the most relatively abundant overall and was enriched at day 0. The concentration of 12 antimicrobial resistance determinants in the compost mixtures was also determined, and 10 of these determinants decreased significantly from days 0 to 99. The addition of construction and demolition waste did not affect the persistence of antimicrobial resistance genes or community structure of the compost microbiota and therefore co-composting construction and demolition waste with cattle manure offers a safe, viable way to divert this waste from landfills.
Highlights
Agricultural operations often produce large amounts of manure which if applied directly to agricultural land can have a negative effect on soil, water, and air quality through contamination, odour and gas emissions, and nutrient leaching [1]
The objective of the current study was to investigate the dynamics of the archaeal, bacterial, and fungi microbiota in two different types of composted feedlot cattle manure and to determine what effect the addition of construction and demolition (C&D) waste has on these microbiota, over a 99-day period
Manure from feedlot cattle fed either a barley-based control diet (CON) or corn dried distillers grain and solubles (DDG) diet was composted over a 99-day period
Summary
The objective of the current study was to investigate the dynamics of the archaeal, bacterial, and fungi microbiota in two different types of composted feedlot cattle manure and to determine what effect the addition of C&D waste has on these microbiota, over a 99-day period
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