Abstract
Objectives: This study aims to determine the effects of various pretreatment methods on the biomass properties and biogas yield in the anaerobic co-digestion of agricultural biomass waste co-digested with different biomass feedstocks for power generation applications. Methods: This study was carried out in order to determine the effects of the methane production on the two pre-treatments (3% and 4% w/v NaOH) subjected to sequential NaOH-ultrasonication and Liquid Hot Water treatment for the rice straw and coconut shell feedstocks, which can be used as substrates for the anaerobic co-digestion experiments; using cow manure, digested manures and sewage sludge as inoculant. Findings: Results showed that the methane production increased by 140% and 290% from the pre-treatment of rice straw and coconut shells, respectively. With these, the pre-treated coconut shell subjected to ultrasonication with 3% NaOH and Liquid Hot Water has the best effect among the pre-treatment of biomass feedstocks of rice straw and coconut shell at various NaOH concentrations. Applications: The results of this experiment would give a viable estimate on the possible methane production from codigestion of these resources. The enhancement of the biogas yield was attributed to the improvement of biodegradability of rice straw and coconut shell through the pre-treatments. The changes of chemical compositions, chemical structures, and physical characteristics made rice straw and coconut shell feedstocks become more available and biodegradable and thus were responsible for the enhancement of the biogas yield. These results are contributing to develop a feasible biogas production from rice straw and coconut shell. Keywords: Anaerobic Digestion, Biogas, Cattle Manure, Coconut Shell, Rice Straw, Sewage Sludge
Highlights
IntroductionRenewable energy produced from lignocellulosic materials (i.e. agriculture and forest residues), non-food crops (i.e. algae and grasses) or industrial waste and residue streams have considerably lower Greenhouse Gas emissions (GHGs) due to its closed carbon cycle
Renewable energy produced from lignocellulosic materials, non-food crops or industrial waste and residue streams have considerably lower Greenhouse Gas emissions (GHGs) due to its closed carbon cycle
Based on the characterization results, the coconut shell and rice straw potentially be used as a substrate for the biogas production since it has lower nitrogen content (0.81% and 0.82%), which is a factor to consider in order to avoid ammonia inhibition of the digestion process
Summary
Renewable energy produced from lignocellulosic materials (i.e. agriculture and forest residues), non-food crops (i.e. algae and grasses) or industrial waste and residue streams have considerably lower Greenhouse Gas emissions (GHGs) due to its closed carbon cycle. With the abundant availability of agricultural biomass in the Philippines makes it a highly interesting source of feedstock, from a variety of crops like palay, corn, sugarcane, cassava and coconut and from livestock manure of carabao, cattle, hog, goat and dairy, that can be utilized for biogas production. These sources can serve as fuel for power generation or as feedstock for advanced biofuels production.
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