Biogas production from duck manure by anaerobic digestion

• Main Author: San Gabriel, Alma C.
• Format: text
• Language: English
• Published: Animo Repository 1997
• Subjects: Biogas; Ducks > Manure; Biodegradation; Bacteria; Anaerobic; Organic wastes > Recycling; Methane; Chemical Engineering
• Online Access: https://animorepository.dlsu.edu.ph/etd_masteral/1814
• Institution: De La Salle University

This study investigates the production of biogas from duck manure by anaerobic digestion. An all-metal fixed dome digester was used for production of methane from duck manure under mesophilic temperatures (20-40 degrees Centigrade). Biogas production was carried out on batch and semi-continuous processes. Different manure-water proportions and varying amounts of starter were studied under batch process. Results for this process showed that 1:1 with 25 percent starter was the highest producer of biogas than 1:1 with 20 percent starter and 1:2.5 with 25 percent starter. The cumulative biogas volume for 1:1 with 25 percent starter was 792.71 liters from 80 liters of feed digested for 30 days. This ratio also gave the highest methane content of 68 percent. For semi-continuous process, the effects on biogas production of different hydraulic retention times and different organic loading rates were investigated. Manure-water ratio of 1:1 was fed into the digester at varying feed rates and organic loading rates ranging from 0.1286 g - 1.60 g Chemical Oxygen Demand (COD) per L-day. Results showed that highest methane conversion was 2.8 liters CH4 per gram COD removed was achieved at 10-day Hydraulic Retention Time (HRT) with methane content of 63 percent. Highest methane content, however, was achieved at 21-day HRT with 68 percent. An average reduction of 65 percent on COD was attained for batch process and at 21-day and 10-day HRT.