Potential of Abattoir Waste for Bioenergy as Sustainable Management, Eastern Ethiopia, 2019

Abstract

Our environment is facing serious problems of high volumes of waste generation and inadequate disposal system in worldwide particularly in developing countries. There is also lack of studies on quantification of abattoir waste and lack of workers awareness towards abattoir waste. Therefore, the purpose of the study was to estimate abattoir waste for bioenergy potential as sustainable management. A cross-sectional study was conducted in four selected abattoirs of Eastern Ethiopia from January 1st, 2018 to December 30th, 2018. The magnitude of abattoir waste composition was computed based on Aniebo mathematical computational from the actual number of slaughtered livestock. The study demonstrated that four selected abattoirs generate 1,606.403 ton of abattoir waste per year and using anaerobic digestion of about 85,139 m3/year of biogas and 111.25 ton/year of biofertilizer can be produced. The biogas or energy from the waste can replace firewood and charcoal and the expensive fossil fuels. Using Banks mathematical computation about 20,054.12 m3/year production of biogas could replace 20.56 ton/year of energy consumed by liquefied petroleum gas, kerosene, charcoal, furnace oil, petrol, and diesel in average. The current estimated biofertilizer (111.25 ton/year) from four abattoir sites can cover about 2,225 hectares/year with its advantage and efficiency of soil. When turned into cost, about $55,645 per year of price could estimate from biogas and biofertilizer. The study concluded that huge amount of biogas and dry biofertilizer yields could produce from abattoir waste through anaerobic digestion. Therefore, installing anaerobic digestion plant is recommended to ensure environmental safety and public health.

Exploring Biogas and Biofertilizer Production from Abattoir Wastes in Nigeria Using a Multi-Criteria Assessment Approach

“…Taking TS = 15%, = 1052 kg/m 3 was obtained and applied. Estimation of Possible Reduction of Green House Gas (GHG) Emissions: The decrease in GHGs by the production of biogas from abattoir waste was calculated using the mathematical computational method developed by IPCC and applied by Tolera and Alemu [21], expressed as GHG reduction potential of AD equal to the estimate of GHG emissions from dumping sites minus the estimate of GHG emissions from AD:…”

“…Estimation of Possible Reduction of GHG Emissions: A model for computation proposed by the IPCC with default values for the various coefficients and used by Tolera and Alemu [21] was applied to estimate the values of GHG reduction potential in terms of t CO 2 eq, Figure 5. The aggregate GHG reduction potential by installation of AD plants at the 4 sites is 30.71 t CO 2 eq.…”

“…The GHG emission reduction potential could be determined using mathematical computation given by the Intergovernmental Panel on Climate Change (IPCC) Several experiments have demonstrated success in converting abattoir wastes by AD into biogas and biofertilizer [17,18], as well as its potency in reducing environmental pollution problems associated with abattoir waste disposal. The GHG emission reduction potential could be determined using mathematical computation given by the Intergovernmental Panel on Climate Change (IPCC) [19], Joint Global Change Research Institute (JGCRI) [20], and Tolera and Alemu [21]. The AD process could also be improved by applying enzymes to produce animal feed from fibrous agricultural wastes like sugarcane bagasse and wheat straw for improved bio-utilization of nutrient contents and the biodegradation of fibrous feeds [22].…”

Knowledge, Attitude, and Practice of Abattoir Workers Toward Abattoirs Waste Management in Eastern Ethiopia

“…A large amount of wastes generated from the selected abattoirs in Eastern Ethiopia is simply discharged or released into the environment without any management system or treatment pond. 15 To reduce these problems, adequate knowledge and practice of proper waste management are of tremendous significance which considering the aforementioned hazards related to abattoir wastes coupled with other life limiting factors. 16…”

Slaughterhouse and poultry wastes: management practices, feedstocks for renewable energy production, and recovery of value added products

“…Furthermore, the amount of solid waste generation depends on the scale of the slaughtering process. Improper disposal of abattoir waste not only affects the air and water quality but also increases the threats to human health due to the presence of pathogenic microbes [9]. It is reported that about one-third to one-half of the total weight of slaughtered animal remains as unutilized or partly utilized byproducts of livestock and poultry industry [10,11].…”