A research into anaerobic digestion of pig farming waste and household organic waste in rural areas to produce methane and organic fertilizer

Abstract

Household organic waste was mixed with pig farming waste in anaerobic digestion equipment at a specified rate. Three experimental series TN1, TN2, and TN3 were established with the ratio of pig farming waste:household organic waste 100:0, 90:10, and 85:15, respectively. The results obtained after 25 days of follow-up showed that the efficiency of COD removal was from 61.77 to 69.93%, higher than COD removal from 53.73 to 60.30%; the volume of gas generated in the experiment was respectively 107.31 ml/gCODt in TN1, 107.24 ml/gCODt in TN2 and 108.40 ml/gCODt in TN3. Biogas after the treatment of eliminating CO₂ , CH₄ content increased from 64-65% to 81-90%; H₂S content met the standard for cooking (1,000 ppm). The products obtained from the post-biogas composting combined with household organic waste had the same composition as the microorganic organic fertilizer as specified in TCVN7185:2002.