Document Type : Research Article-en
Authors
1 Department of Mechanical Engineering, School of Mechanical, Chemical and Materials Engineering at Adama Science and Technology University, Adama, Ethiopia
2 Department of Mechanical Engineering, Sinhgad College of Engineering, Vadgaon (BK.), Pune-411041, Pune University, India
Abstract
This research seeks to determine the highest possible yield by integrating wastewater treatment plant sludge with food waste from plate scraps at Adama Science and Technology University (ASTU) in Ethiopia. Feedstock characterization and biogas co-generation were done on different Plate Scrap (PS), Wastewater Treatment Plant Sludge (WTPS), and 100 ml cow manure combination ratios. The feedstocks were evaluated for their TS and MC before combination, and TS, VS, TDS, COD, BOD, and pH after combination. This experiment was done in two rounds using three water baths and twenty-seven Batch Reactors (BR) with 2.5 L volume each. In the first round, eighteen reactors were used, and nine were used in the second experiment. Triplicate testing was used to evaluate the feedstock sample characteristics and to run the experiment. The reactors were operated for thirty-five days at a hydraulic retention time and a temperature of 50 °C. The daily biogas yield using the water displacement method, total biogas yield, and methane composition were measured and reported. Three sub-reactors were considered to find the average biogas yield of individual reactors. A notable increase in both daily and total biogas yield was observed with the reactor composition of 75% PS Injera (PSI) flat bread and 25% WTPS. The daily maximum and the average biogas yields were 220 mL and 810 mL, with the TS of 55,066 mg L-1 and the VS of 51,000 mg L-1. The maximum methane inside the produced biogas was 68%, from PSI75% and WTPS25%. This combination also showed the highest biogas yield.
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©2025 The author(s). This is an open access article distributed under Creative Commons Attribution 4.0 International License (CC BY 4.0)
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