A study on the effect of water addition on the production of methane gas from anaerobic digestion of duck waste

• Main Authors: Casiguran, Mylene F., Sansano, Faith C.
• Format: text
• Language: English
• Published: Animo Repository 1996
• Subjects: Farm manure in methane production; Biogas
• Online Access: https://animorepository.dlsu.edu.ph/etd_bachelors/4114
• Institution: De La Salle University

Anaerobic digestion of animal waste to produce light hydrocarbons and other gaseous fuels has been fully developed into an alternative technology for fuel production. This method is being studied to produce the same output from organic matters generated from duck waste. This study involves methane production from duck manure with septic waste as starter mixed with water at different ratios. Biogas is produced anaerobic digestion operation due to microbial activities. The digestion set-up is composed of a digester, a gas holder and water holder. The objective of the study is to determine the duck waste and water ratio that yields the highest methane production. Critical parameters identified and carefully monitored are total gas produced, percent methane and pH. These parameters are correlated with the amount of water that is initially added with the starter. The pH is measured by pH meter and the volume of the biogas generated is monitored by measuring the amount of water displaced. Results show that the highest methane production is observed in the 1:2 duck waste/water ratio which registers 59.89% by weight of methane. It is also observed that the pH of the mixture significantly influenced the production of methane gas pH decreases as digestion progresses and later rebound. The decrease in can be attributed to the hydrolysis and subsequent production of organic acids from the organic matter in the substrate. The rebound or increase in pH is due to the conversion of these acids to biogas."