马铃薯渣与鸡粪混合原料厌氧发酵条件优化

The optimum of anaerobic fermentation condition for mixed feedstock of potato residues and chicken feces

以混合后的马铃薯渣和鸡粪为原料,研究了其总固形物含量(TS)、起始p H以及接种量3个因素对厌氧发酵甲烷产量的影响,并利用正交试验对影响沼气产量和甲烷含量的因素进行了优化。结果表明,在初始TS为3%的处理中,产气时间、产气量和甲烷含量分别为7 d,383.2 m L/g和45.3%,在所有处理中最高;在初始p H为7.0的处理中,产气时间、产气量和甲烷含量分别为7 d,342.5 m L/g和45.2%;在接种量为5%,8%,10%和12%的处理中,后两种处理在沼气产量和甲烷含量方面表现最好,产气量分别为368.4 m L/g和405.4 m L/g,12%处理的产气量最高。优化结果表明,3个因素对厌氧发酵影响的重要性为TS>p H>接种量,最适合的组合为初始TS 3%,p H 7.0和接种量10%。在此优化培养条件下,发酵体系的产气量为383.2 m L/g。

With potato residues and chicken feces as mixed feedstock,the effect of total solid（TS）,initial p H and inoculation quantity on anaerobic fermentation and methane concentration were studied and optimized by orthogonal test.The results showed that the duration of biogas production,the yield of methane and methane concentration were 7 days,383.2mL/g and 45.3%,respectively,when the TS was 3%; The duration of biogas production,the yield of methane and methane concentration was 7 days,342.5mL/g and 45.2%,respectively,when the initial p H was 7.0,which was the best among all treatments of initial p H; The duration of biogas production,biogas yield and methane concentration for inoculation of 10% and 12% were similar and the best among four treatments of 5.0%,8.0%,10.0% and 12.0%,and the yield of methane of treatments 10% and12% were 368.4mL/g and 405.4 mL/g,respectively,and the yield of methane for treatment 12% was the highest among all treatments.The orthogonal test indicated that the effect of TS on anaerobic fermentation was the most remarkable,and the next was initial p H and the last was inoculation quantity among three factors.The optimum anaerobic digestion parameters were 3% of TS,initial pH 7.0 and 10% of inoculation quantity,and under these conditions the yield of methane could reached 383.2mL/g.