Effect of trace element addition and increasing organic loading rates on the anaerobic digestion of cattle slaughterhouse wastewater. (September 2018)

• Record Type: Journal Article
• Authors: Schmidt, Thomas; McCabe, Bernadette K.; Harris, Peter W.; Lee, Seonmi
• Is Part Of: Bioresource technology. Volume 264(2018)
• Page Start: 51
• Page End: 57
• Publication Date: 2018-09
• Subjects: Continuous digestion -- CSTR -- Abattoir -- Process stability -- Fats, oils and greases -- Red meat processing; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.05.050
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Fe, Ni, Co, Mn and Mo concentrations were found to be deficient in the wastewater. Addition of these trace elements improved the AD of slaughterhouse wastewater. Higher OLR and lower HRT were achieved when trace elements were applied. Improved process stability resulted in more biogas generated compared to controls. Abstract: In this study, anaerobic digestion of slaughterhouse wastewater with the addition of trace elements was monitored for biogas quantity, quality and process stability using CSTR digesters operated at mesophilic temperature. The determination of trace element concentrations was shown to be deficient in Fe, Ni, Co, Mn and Mo compared to recommendations given in the literature. Addition of these trace elements resulted in enhanced degradation efficiency, higher biogas production and improved process stability. Higher organic loading rates and lower hydraulic retention times were achieved in comparison to the control digesters. A critical accumulation of volatile fatty acids was observed at an organic loading rate of 1.82 g L –1 d –1 in the control compared to 2.36 g L –1 d –1 in the digesters with trace element addition. The improved process stability was evident in the final weeks of experimentation, in which control reactors produced 84% less biogas per day compared to the reactors containing trace elements.