Study on Biogas Production from Anaerobic Co-digestion of Food Waste and Cow Manure

Food waste anaerobic digestes alone will easily acidificate. Anaerobic co-digestion method was adpot to solve this problem.Food waste(FW) and cow manure(CM) were used as raw material,at the temperature of 35 ℃,the impact of the different reaction ratio to the co-anaerobic digestion efficiency with food waste and cow manure was studied by sequencing batch. The results showed that the best FW and CW reaction rate was 3∶1,the total gas production was 3 750.5 m L,which was there times of the FW digestesd alone,and the methane volume fraction was 58.7%,p H kept at 7.3~7.5,and the system didn't acidificate.The concentration of ammonia nitrogen kept at 2 000~2 200 mg/L. The highest absorbance value of coenzyme F420was0.72. Food waste anaerobic digested alone acidificated, the reaction failed to run. From the above results,we can know that co-digestion is benefit for anaerobic digestion,it could improve the efficiency of the anaerobic fermentation of food waste.