Anaerobic Co-digestion Effects of Manure and Straw and Analysis of Influencing Factors

In order to investigate the effects of anaerobic co-digestion and related influences,selected raw materials,cow dung,chicken manure and straw,were divided into groups with single and mixture of two or three kinds of materials according to the proportion of total solid concentration.The experiments were conducted at 20 ℃ and 30 ℃,and the effects of mixture,temperature,C/N ratio,pH and on anaerobic co-digestion were studied.The results indicated that anaerobic co-digestion could significantly improve the total gas volume,the utilization ratio and efficiency of TS after fermentation;and the effects of co-digestion of three types of raw materials-cow dung,chicken manure and straw was significantly better than those of the single digestion and co-digestion of two kinds of materials.The effect of co-digestion at mesospheric temperature was greatly better than that at cryophilic temperature;the C/N ratio and pH of the mixed raw materials were accommodated into a feasible scope to improve the effects of co-digestion;the optimal C/N ratio of three types of raw materials was 25.64~27.54;the change of the pH value of the mixed raw materials in the co-digestion was stable and it was easier to maintain in optimum pH range during fermentation.Mixture,temperature,C/N ratio and pH were all major factors to determine co-digestion.