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本研究以米糠为碳源,调控消化原料碳氮比(C/N)和接种量以减缓氨氮抑制厌氧消化的作用,为生产中利用蛋鸡粪厌氧消化产沼气提供指导。结果表明:在相同C/N下,40%接种量的总产气量和产甲烷量都显著高于20%的接种量;C/N为11/1,接种量为40%时,厌氧消化产生的累积总产气量和产甲烷量达到最高,分别为8859.67mL和1290.73mL;pH值、挥发性脂肪酸(VFA)等指标研究表明,这主要是由于高C/N导致pH值降低,抑制了甲烷菌的活性,VFA与高氮有机物的分解缓解了氨氮抑制效应。
In this study, rice bran was used as carbon source to control the C / N ratio and inoculum volume of digested feedstock to reduce the effect of ammonia nitrogen in inhibiting anaerobic digestion. The results showed that under the same C / N ratio, the amount of 40% inoculation and the amount of methanogenesis were significantly higher than the inoculum size of 20%; C / N was 11/1, and the inoculum size was 40% Cumulative total gas production and methanogenesis reached the highest levels of 8859.67mL and 1290.73mL, respectively. The study of pH value and VFA showed that this was mainly due to the decrease of pH and inhibition of high C / N The activity of methanogens and the decomposition of VFA and high-nitrogen organic compounds alleviated the ammonia-nitrogen inhibitory effect.