Response Surface Methodology as an Optimization Tool for Anaerobic Digestion of Food Waste
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Response Surface Methodology as an Optimization Tool for Anaerobic Digestion of Food Waste Brayan Alexis Parra-Orobio & Wilmar Alexander Torres-López & Patricia Torres-Lozada
Received: 20 February 2020 / Accepted: 13 July 2020 # Springer Nature Switzerland AG 2020
Abstract Biowastes are the main fraction of municipal solid waste (MSW), and of this, food waste (FW) is the predominant component. Given that FW is predominantly biodegradable organic matter, approach strategies such as anaerobic digestion (AD) are suitable to apply on these substrates because these process also produces methane gas as a renewable energy source, particularly important given the depletion of nonrenewable energy sources. This study evaluated the influence of two parameters on AD: substrate-inoculum ratio (S/I: 0.5 to 2.0 gVSsubstrate gVSinoculum−1) and pH (7.0 to 8.0 units) on biochemical methane potential (BMP) using the response surface methodology (RSM), a valuable tool which can be used to establish strategies that allow for the control and optimization of the AD of FW. Of the conditions evaluated, it was found that the optimal S/I ratio and pH conditions to guarantee the highest BMP (297.05 ± 14.38 mL CH4 gVS−1) were S/I ratio = 0.19 gVSsubstrate gVSinoculum−1 and pH = 7.5. Although B. A. Parra-Orobio : P. Torres-Lozada (*) Universidad del Valle, Faculty of Engineering, Study and Control of Environmental Pollution-ECCA Research Group. , Calle 13, # 100-00 Cali, Colombia e-mail: [email protected]
B. A. Parra-Orobio e-mail: [email protected] W. A. Torres-López Faculty of Natural Sciences, Universidad del Valle, Calle 13, # 100-00 Cali, Colombia e-mail: [email protected]
the hydrolysis constant (kh) was low, in all conditions, it was in the range reported for substrates with a high carbohydrate content, such as FW (0.002–0.25 day−1). In this study, pH was found to be the factor that had the most significant effect on kh and BMP. Keywords Biochemical methane potential . Bioenergy . Food waste . Optimization . pH . S/I ratio
1 Introduction The quantity and composition of municipal solid waste (MSW) are variables which depend on many factors, such as culture, socioeconomic level, geographical location, and meteorological conditions, with organic matter being the predominant fraction (Soto-Paz et al. 2015; Khan et al. 2016). Within this fraction, food waste (FW) represents more than 40% (Sosnowski et al. 2003) and is even greater (40 to 75%) in most Latin American countries (Hernández-Shek et al. 2016). The high organic load of FW makes it suitable for treatment and approach using biological processes, such as composting and anaerobic digestion (AD), with the last being one of the most widely used options in different regions worldwide since it also reduces the amount of material ending up in landfill and stabilizes the organic material prior to disposal, in order to reduce future environmental impacts from air and water emissions and to recover energy (Sajeena Beevi et al
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