Enhanced biogas production from chicken manure via enzymatic pretreatment
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ORIGINAL ARTICLE
Enhanced biogas production from chicken manure via enzymatic pretreatment M. A. Kucuker1 · B. Demirel2 · T. T. Onay2 Received: 4 December 2019 / Accepted: 14 April 2020 © Springer Japan KK, part of Springer Nature 2020
Abstract Livestock production residues are commonly used as substrates in agricultural biogas plants for energy recovery. Cattle and poultry manure can be converted to biogas in farm-scale or centralized biogas plants to produce heat and power. This study investigated batch anaerobic digestion of chicken manure coupled with a biological pre-treatment step. The primary objective of this laboratory-scale work was to improve the biological degradability of the mono substrate to obtain higher biogas and methane yields through using an enzymatic pre-treatment. The experimental results showed that the enzymatic pre-treatment for the chicken manure significantly increased the biogas production by about 35% in comparison to the control without enzymatic pre-treatment. Therefore, it can be concluded that the enzymatic pre-treatment of chicken manure could provide improved biogas and methane yields when the chicken manure is used as mono substrate for anaerobic digestion in agricultural biogas plants. Keywords Anaerobic digestion · Biogas · Chicken manure · Enzymatic pre-treatment
Introduction Extensive production of animal manure and agro-industry wastes throughout the entire world can lead to adverse environmental problems. The most serious environmental risks such as greenhouse gases ( CO2 and C H4) and the transportation of pathogenic microorganism could be caused by untreated or poorly-treated animal manure. Therefore, stabilizing and treating the animal manure through the production of biogas can alleviate the current situation of the environment [1–4]. Biogas from organic wastes such as animal manure can be generated through anaerobic digestion (AD) processes [5]. Anaerobic digestion is a set of biological processes including hydrolysis, acidogenesis, acetogenesis and methanogenesis. During anaerobic digestion, which occurs in the absence of oxygen, microbes break out the biodegradable parts of the wastes and convert them to CO2 and CH4 that * B. Demirel [email protected] 1
Department of Environmental Engineering, Çanakkale Onsekiz Mart University, 17020 Çanakkale, Turkey
Institute of Environmental Sciences, Bogazici University, Bebek, 34342 Istanbul, Turkey
2
can be used as a renewable energy source for the production of heat, fuel and electricity [3, 6]. Furthermore, the pathogenic microorganisms will be also destroyed and eventually the digestate can further be utilized as an organic fertilizer in agricultural activities [2]. Particularly, production of biogas from renewable biomass and its use flexible use for heat, power and transportation has gained extreme importance in the European Union (EU) and its Member States, thus, biogas production was recently reported to reach 18 billion m3 of CH4 (654 PJ) in 2015, accounting almost 50% of the global biogas
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