Romano Rowena T, Zhang Ruihong
Department of Biological and Agricultural Engineering, 2030 Bainer Hall, University of California, One Shields Avenue, Davis, CA 95616-5294, USA.
Bioresour Technol. 2008 Feb;99(3):631-7. doi: 10.1016/j.biortech.2006.12.043. Epub 2007 Jun 1.
The co-digestion of onion juice and aerobic wastewater sludge produced from an onion processor using an anaerobic mixed biofilm reactor (AMBR) was investigated for biogas energy production potential and waste treatment. Two experiments were conducted to study the performance of an AMBR at different organic loading rates (OLRs) using different mixtures of onion juice and aerobic sludge. In the first experiment, the OLR was increased from 1.24 to 4.37 gVS/L/d by increasing the amount of onion juice in the feed mixture while maintaining a constant amount of aerobic sludge. When the OLR reached 4.37 gVS/L/d, the AMBR failed as indicated by decreased biogas production and pH. Increase of carbon to nitrogen ratio (C/N) from 13.7 to 20.3 and lack of proper alkalinity were suspected to be the causes for the failure. In the second experiment, the C/N of the feed mixture was maintained at about 15 while the OLR was increased from 1.40 to 3.60 gVS/L/d. The digester showed stable performance. The average biogas and methane yields of the two experiments were 0.62 +/- 0.05 L/gVS and 0.37 +/- 0.08 L/gVS, respectively. It was concluded that the C/N of about 15 was recommended for treating the mixture of onion juice and aerobic sludge.
利用厌氧混合生物膜反应器（AMBR）对洋葱加工过程中产生的洋葱汁与好氧废水污泥进行共消化处理，以研究其沼气能源生产潜力及废物处理效果。进行了两项实验，分别使用不同比例的洋葱汁和好氧污泥混合物，研究AMBR在不同有机负荷率（OLR）下的性能。在第一个实验中，通过增加进料混合物中洋葱汁的量，同时保持好氧污泥量不变，将OLR从1.24提高到4.37 gVS/L/d。当OLR达到4.37 gVS/L/d时，AMBR出现故障，表现为沼气产量和pH值下降。碳氮比（C/N）从13.7增加到20.3以及缺乏适当的碱度被怀疑是导致故障的原因。在第二个实验中，进料混合物的C/N保持在约15，同时OLR从1.40提高到3.60 gVS/L/d。消化器表现出稳定的性能。两项实验的平均沼气产量和甲烷产量分别为0.62±0.05 L/gVS和0.37±0.08 L/gVS。得出的结论是，处理洋葱汁和好氧污泥混合物时，建议C/N约为15。
