Abstract
Objectives: In the present work, different pretreatment methods (milling, ultrasonication, liquid hot water, and alkali hydrolysis) were evaluated on rice straw and coconut shell that can be used as a substrate for biogas production for vehicle fuel, provide heat and generate electricity. Methods: This was achieved by the sequential combination of ultrasonication, hot water, and alkali hydrolysis treatment at a various concentration (4% and 5% w/v) was evaluated. Additionally, Fourier Transform Infrared (FT-IR) was used as one of the methods in identifying structural differences and identification of compounds in the treated biomass. Findings: The results showed that the combination of ultrasonication-alkali hydrolysis, hot liquid water using 3% of NaOH improved methane yield of 150% for rice straw and 290% for coconut shell compared with the original treatment. Additionally, FT-IR identified modifications in the biomass structure after different types of pretreatments and conditions. Application: The results of this research are the initial steps for the development of new processes using the Ultrasonication-NaOH LHW pretreatment, for the production of biogas from agricultural biomass waste. Keywords: Biogas, Co-Digestion, Liquid Hot Water, Methane, Pretreatment, Ultrasonication
Highlights
IntroductionThe global effects of changing climatic patterns are becoming more evident
In recent years, the global effects of changing climatic patterns are becoming more evident
The Philippines, which is deemed to be highly vulnerable to the impacts of climate change and natural hazards, committed to reducing 70% of its GHG emissions (CO2e) by 2030 based from its Business As Usual (BAU) scenario of 2000-2030
Summary
The global effects of changing climatic patterns are becoming more evident. Scientists are expecting a continuous rise in global temperatures mainly due to greenhouse gas production. Because of the threatening after math of varying weather conditions, international cooperation among different countries was fostered to achieve the shared goal of reducing greenhouse gas emissions. The Philippines, which is deemed to be highly vulnerable to the impacts of climate change and natural hazards, committed to reducing 70% of its GHG emissions (CO2e) by 2030 based from its Business As Usual (BAU) scenario of 2000-2030. This reduction will come from the energy, transport, waste, forestry and industry sectors. The Philippines is highly susceptible to fluctuating global prices since the country is heavily dependent on imported
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