EFFECTS OF HYDRAULIC RETENTION TIME AND PH FOR THERMAL EFFICIENCY IN BIOGAS PRODUCTS FROM FOOD WASTE VIA ANAEROBIC DIGESTION METHOD
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Abstract
This study explores the influence of hydraulic retention time (HRT) and pH on the efficiency of biogas production and methane (CH₄) concentration in anaerobic digestion systems. Findings indicate that extending HRT enhances biogas output and improves methane purity, while simultaneously reducing levels of carbon dioxide (CO₂), oxygen (O₂), and nitrogen (N₂), reflecting more effective methanogenic activity. As HRT increases from 10 to 30 days, biogas yield improves from 0.6 to 1.0 m³/kg.VS, and CH₄ concentration rises from 54.71% to 65.92%. The decline in CO₂ content from 37.89% to 31.38% further supports the development of more stable anaerobic conditions. Despite these benefits, extended HRTs require larger digester capacities and raise operational expenses, underlining the necessity of identifying an economically viable operational window. At an HRT of 30 days, pH variation shows that methane levels grow from 63.78% at pH 6.0 to a peak of 73.46% at pH 9.0, with optimal methanogenesis observed between pH 7.0 and 8.5. The study also observes significant reductions in chemical oxygen demand (COD) within the first 10 days, indicating rapid breakdown of organic substrates. Alkaline conditions appear to mitigate the inhibitory effects of volatile fatty acids, thereby enhancing methane quality, calorific value, and thermal efficiency. Overall, the result showed that emphasize the critical role of fine-tuning both HRT and pH to maximize biogas yield, improve energy recovery, and promote more sustainable anaerobic digestion system performance.
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เนื้อหาและข่อมูลในบทความที่ลงตีพิมพ์ในวารสารวิชาการ เทคโนโลยี พลังงาน และสิ่งแวดล้อม บัณฑิตวิทยาลัย วิทยาลัยเทคโนโลยีสยาม ถือเป็นข้อคิดเห็นและความรับผิดชอบของผู้เขียนบทความโดยตรง ซึ่งกองบรรณาธิการวารสารไม่จำเป็นต้องเห็นด้วย หรือว่าร่วมรับผิดชอบใด ๆ
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการตีพิมพ์ในวารสารวิชาการ เทคโนโลยี พลังงาน และสิ่งแวดล้อม บัณฑิตวิทยาลัย วิทยาลัยเทคโนโลยีสยาม ถือเป็นลิขสิทธิ์ของวารสารวิชาการ เทคโนโลยี พลังงาน และสิ่งแวดล้อม บัณฑิตวิทยาลัย วิทยาลัยเทคโนโลยีสยาม หากบุคคล หรือหน่วยงานใดต้องการนำทั้งหมด หรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อ หรือเพื่อกระทำการใด ๆ จะต้องได้รับอนุญาต เป็นลายลักษณ์อักษรจากวารสารวิชาการ เทคโนโลยี พลังงาน และสิ่งแวดล้อม บัณฑิตวิทยาลัย วิทยาลัยเทคโนโลยีสยาม เท่านั้น
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