Effect of storage time on swine manure solid separation efficiency by screening

• Published in: Bioresource technology Vol. 100; no. 5; pp. 1815 - 1818
• Main Authors: Kunz, A., Steinmetz, R.L.R., Ramme, M.A., Coldebella, A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2009; [New York, NY]: Elsevier Ltd; Elsevier
• Subjects: agricultural wastes; ammonia; Anaerobic digestion; analysis; animal husbandry; Animals; Biodegradation, Environmental; Biological and medical sciences; Biological treatment of sewage sludges and wastes; Biotechnology; Brazil; chemical oxygen demand; Environment and pollution; Fundamental and applied biological sciences. Psychology; Industrial applications and implications. Economical aspects; liquid manure; Manure; Manure - analysis; Manure - microbiology; manure handling; manure storage; methods; microbiology; nitrogen; Nitrogen - analysis; organic matter; Oxygen; Oxygen - analysis; particulates; phosphorus; physicochemical properties; pig manure; Screening; solid retention efficiency; Solid–liquid separation; Storage; storage time; Swine; swine housing; Swine Manure; Time Factors; total Kjeldhal nitrogen; Tropical Climate; Waste Disposal, Fluid; Waste Disposal, Fluid - methods; waste treatment; Brazil; Screening; Storage; Solid–liquid separation; Swine Manure; Anaerobic digestion; Pig manure; Solid liquid separation; Storage time; Solid-liquid separation
• ISSN: 0960-8524; 1873-2976; 1873-2976
• DOI: 10.1016/j.biortech.2008.09.022

Confined animal feeding operations (CAFOs) have suffered considerable transformations since the last decade in Brazil, because of increasing of their production scale. Swine production is following this same trend, and the volume of manure produced and the form that is managed has a direct impact on houses air quality and efficiency of treatment systems. The objective of this work was to study the manure solid–liquid separation efficiency by screening, subject to different screen opening sizes and pit disposal time under tropical climate conditions. An ammoniacal nitrogen producing rate of 24 mg/L per storage day was observed and a decrease in screen separation efficiency in the first eight days of storage, obtained by solid group analysis. The storage time influenced directly the degradation of organic fraction indicated by the chemical oxygen demand increase overtime. The results suggest that the efficiency of solid–liquid separation is increased when carried out with the shortest storage time.