Effect of turning frequency and season on composting materials from swine high-rise facilities

Waste Management
K L CookC H Bolster

Abstract

Composting swine slurries has several advantages, liquid slurries are converted to solids at lower moisture, the total volume and weight of material is reduced and the stabilized product is more easily transported off-site. Despite this, swine waste is generally stored, treated and applied in its liquid form. High-rise finishing facilities (HRFF) permit liquid slurries to be converted to solids which are partially decomposed underneath the HRFF and then finished in compost windrows. The purpose of this study was to evaluate the effect of turning frequency and ambient weather conditions on biological, physical and chemical properties of composted slurry-woodchip mixtures from HRFF. Compost trials were conducted in either fall (FT) or spring (ST) and piles were turned once or three times per week or upon compost temperature reaching 65°C. Physical, chemical and microbiological characteristics were measured over the course of 112 (FT) or 143 (ST) days of composting. Total carbon, total nitrogen (N) and inorganic N decreased in all piles. Ammonium decreased while nitrate increased in all piles (including unturned), but total N losses were greatest in piles turned more frequently during the ST. Microbial populations of nitrifiers we...Continue Reading

References

Feb 5, 2003·Environmental Science & Technology·Gerda HarmsGary S Sayler
Sep 16, 2005·Journal of Applied Microbiology·S M Tiquia
Sep 28, 2005·Proceedings of the National Academy of Sciences of the United States of America·Christopher A FrancisBrian B Oakley
Sep 11, 2007·Waste Management·A de GuardiaC Druilhe
Aug 3, 2011·Bioresource Technology·Gemma Mc CarthyGillian E Gardiner
Jan 21, 2012·Bioresource Technology·Ammaiyappan SelvamJonathan W C Wong
Dec 3, 2013·Journal of Environmental Management·Marieke ten HoeveSander Bruun

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