Date of Completion

2023

Document Type

Thesis

Degree Name

Bachelor of Science in Biotechnology

Keywords

Biogas, digester, flame assessment

Abstract

The Philippines continues to rely on imported fossil fuels for its energy needs, and with the recent events of the year 2020, the prices of gas and electricity are rapidly increasing. Thus, this study focuses on utilizing Sus scrofa domesticus manure, Gallus gallus manure combined with food waste to produce biogas more efficiently than traditional biogas digesters. The research is conducted in Dasmarinas Cavite, Philippines. Biogas is a renewable energy source that occurs when organic materials, such as food scraps and animal waste, undergo anaerobic digestion. The process of anaerobic digestion involves the breakdown of organic materials by microorganisms in the absence of oxygen, resulting in the production of methanogens that produce methane. The ratio of the mixture is 5:1:1:1, which is 50% composed of H2O, and the other 5 kgs each of manures, food waste, and Cymbopogon citratus. The mixture was subject to fermentation for 30 days. The pH, pressure, temperature, and gas bag were checked during pre-fermentation and post-fermentation. The findings of the study indicate the post-fermentation physical parameters, such as temperature, pH, pressure, and gas bag size, have a significant impact on biogas production. There was a slight difference in temperature decreasing from 34°C to 31.47°C for pre and post-fermentation of, respectively. At pre-fermentation process the pH is 8.24 and ph 8 was measured at post fermentation. Increased psi values was recorded from 0 psi during prefermentation and 5 psi for post-fermentation indication of biogas production. The color of the flame of the produced biogas after fire ignition was blue which indicates the presence of methane gas was burnt. When ignited, the biogas emitted a slight citrus scent from Cymbopogon citratus degradation, however, not sufficient to mask the manure smell. The digester design offers a costeffective and accessible solution for efficient biogas production. The study highlighted the importance of post-fermentation physical parameters in maximizing biogas yield. These findings contribute to the development of sustainable reduction of excretal pollution emitted from piggeries and poultries, lessening contamination of freshwaters and nearby watersheds. The researchers also conducted a demonstration session with Dasmariñenos in Cavite. Inculcating awareness as the researchers explained the various applications of biogas and its advantages as a conventional biotechnological gas source sustainable anaerobic digestion process converting organic waste into biogas. The materials used for biogas digester construct were also discussed in detailed, highlighting their accessibility and affordability. Further research and development in biogas production is indeed a promotion of an environment-friendly technology fostering sustainable agricultural sector.

First Advisor

Iluminada A. Ronio

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