Evaluation of chemical, thermobaric and thermochemical pre-treatment on anaerobic digestion of high-fat cattle slaughterhouse waste. (November 2017)

• Record Type: Journal Article
• Authors: Harris, Peter W.; Schmidt, Thomas; McCabe, Bernadette K.
• Is Part Of: Bioresource technology. Volume 244:Part 1(2017)
• Page Start: 605
• Page End: 610
• Publication Date: 2017-11
• Subjects: Fat -- Oil and grease -- Abattoir -- Biomethane potential -- Alkali -- Biogas -- Dissolved air flotation sludge; 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.2017.07.179
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Investigated chemical, thermobaric and thermochemical treatment of abattoir waste. Chemical and thermochemical provided greatest increases in SCOD and VFA content. Lag phase was reduced by 20% and 100% in thermochemical & thermal respectively. Study indicates thermobaric pre-treatment is most viable in an industrial context. Abstract: This work aimed to enhance the anaerobic digestion of fat-rich dissolved air flotation (DAF) sludge through chemical, thermobaric, and thermochemical pre-treatment methods. Soluble chemical oxygen demand was enhanced from 16.3% in the control to 20.84% (thermobaric), 40.82% (chemical), and 50.7% (thermochemical). Pre-treatment altered volatile fatty acid concentration by −64% (thermobaric), 127% (chemical) and 228% (thermochemical). Early inhibition was reduced by 20% in the thermochemical group, and 100% in the thermobaric group. Specific methane production was enhanced by 3.28% (chemical), 8.32% (thermobaric), and 8.49% (thermochemical) as a result of pre-treatment. Under batch digestion, thermobaric pre-treatment demonstrated the greatest improvement in methane yield with respect to degree of pre-treatment applied. Thermobaric pre-treatment was also the most viable for implementation at slaughterhouses, with potential for heat-exchange to reduce pre-treatment cost. Further investigation into long-term impact of pre-treatments in semi-continuous digestion experiments will provide additional evaluation of appropriate pre-treatment options for high-fat slaughterhouse wastewater.