Abstract
Abstract This study was carried out to characterize raw and treated Arba Minch town slaughterhouse wastewater and to assess its methane generation potential with lab-scale anaerobic batch reactors. The methane was collected by downward displacement of an alkaline water column. The methane generation potential of the slaughterhouse wastewater was 270.6 mL methane per gram of volatile solids at hydraulic retention time (HRT) of 20 days at 37 °C. The organic loading rate was 0.48 g and the organic matter removal efficiency of the reactor was COD (93.5%), BOD5 (88.5%), and TVS (94.7%). The result demonstrated that installation of a biogas reactor to treat slaughterhouse wastewater can recover methane, reduce pollutants and protect the environment. The result can be a demonstration for untreated slaughterhouse wastewaters in developing countries like Arba Minch Town to use anaerobic treatment and supplement their scarce energy options.
Highlights
Ethiopia has an estimated 60.39 million cattle population, 31.3 million sheep and 32.74 million goats (CSA 2018)
First the characteristics of the raw wastewater that was used for methane generation and the sludge after 20 days are presented in Table 1, the removal efficiency of the system is discussed; the methane production results and their discussion are presented
The wastewater was used for anaerobic digestion without pH adjustment
Summary
Ethiopia has an estimated 60.39 million cattle population, 31.3 million sheep and 32.74 million goats (CSA 2018). Slaughterhouses and meat processing facilities generate a large volume of wastewater that contains organic matter measured as chemical oxygen demand (COD) from 500 to 15,900 mg LÀ1, total nitrogen (50–841 mg/L) and orthophosphate (20–100 mg/L) (Bustillo-lecompte & Mehrvar 2015). Blood is a by-product of the slaughterhouses, representing up to 4% of the live animal weight or 6–7% of the lean meat content of the carcass (Bah et al 2013). It is a problematic by-product of the meat industry because of the high volumes generated and its very high pollutant load when discarded untreated into the environment (Bah et al 2013). Animal faeces and manure are sources of pathogens and other microorganisms in the sludge during biogas production (Islam et al 2019)
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