title: Co-composting of Beef Cattle Feedlot Manure with Construction and Demolition Waste.
abstract: With increased availability of dried distillers' grains with solubles (DDGS) as cattle feed and the need to recycle organic wastes, this research investigated the feasibility of co-composting DDGS cattle feedlot manure with construction and demolition (C&D) waste. Manure was collected from cattle fed a typical western Canadian finishing diet (CK) of 860 g rolled barley ( L.) grain, 100 g barley silage, and 40 g vitamin and mineral supplement kg dry matter (DM) and from cattle fed the same diet but (DG manure) with 300 g kg DM barley grain being replaced by DDGS. The CK and DG manures were co-composted with and without C&D waste in 13 m bins. Compost materials were turned on Days 14, 37, and 64, and terminated on Day 99. Adding C&D waste led to higher compost temperatures (0.4 to 16.3°C, average 7.2°C) than manure alone. Final composts had similar total C, total N, C/N ratios, and water-extractable K, Mg, and NO content across all treatments. However, adding C&D waste increased δC, δN, water-extractable SO, and Ca contents and decreased pH, total P (TP), water-extractable C, N, and P and most volatile fatty acids (VFA). The higher C&D compost temperatures should reduce pathogens while reduced VFA content should reduce odors. When using the final compost product, the increased SO and reduced TP and available N and P content in C&D waste compost should be taken into consideration. Increased S content in C&D compost may be beneficial for some crops grown on S-deficient soils.
authors.forename: Xiying
authors.initials: X
authors.lastname: Hao
authors.forename: Brett
authors.initials: B
authors.lastname: Hill
authors.forename: Pam
authors.initials: P
authors.lastname: Caffyn
authors.forename: Greg
authors.initials: G
authors.lastname: Travis
authors.forename: Andrew F
authors.initials: AF
authors.lastname: Olson
authors.forename: Francis J
authors.initials: FJ
authors.lastname: Larney
authors.forename: Tim
authors.initials: T
authors.lastname: McAllister
authors.forename: Trevor
authors.initials: T
authors.lastname: Alexander