氨氮质量浓度对餐厨垃圾厌氧消化产沼气的影响

Analysis of Ammonia Inhibition on Anaerobic Digestion Via Food Wastes

摘要:

实验研究不同氨氮质量浓度对餐厨垃圾厌氧消化过程的影响。实验结果表明:氨氮质量浓度对餐厨垃圾消化过程中出现的两个产气高峰均有显著影响,最高氨氮质量浓度组最大产气速率分别是对照组的44.8%和45%,产气高峰出现时间比对照组分别延迟6 h和42 h。氨氮质量浓度上升导致反应体系中总有机碳去除率降低,由此计算出氨氮抑制餐厨垃圾厌氧消化过程的半抑制浓度为7 860 mg/L。氨氮质量浓度的升高导致挥发性脂肪酸过量积累,其利用速率也相应减缓。

Abstract:

The effect of ammonia concentration on anaerobic digestion via food wastes was indicated in this study. The results suggested that the ammonia inhibition was affected on the two biogas production peaks during the food waste digestion process. The two maximum biogas production rates under maximum ammonia concentration were 44.8% and 45% of the control and the timepoints of which,compared with the control,were delayed 6 hours and 42 hours,respectively. The IC50ammonia inhibition of food waste digestion was 7 860 mg/L,which was speculated from the fact that the increase of ammonia concentration in the reaction system led to the lowering of total organic carbon removal. The increase of ammonia concentration lead to the excessive accumulation of volatile fatty acids,and the utilization rates of VFAs were also appropriate slow down.