不同有机负荷泔脚废油脂厌氧消化试验研究

Study of Anaerobic Digestion Experiments with Different Organic Loading Rate of Waste Grease from Food Residue

将泔脚中的废油脂与猪粪混合,采用CSTR反应器,在中温(35℃)条件下进行不同有机负荷厌氧消化试验。试验共进行了0.5 gVS/(L.d)、0.75 gVS/(L.d)、1.0 gVS/(L.d)、1.25 gVS/(L.d)、1.5 gVS/(L.d)5个有机负荷。试验表明,在有机负荷小于1.25 gVS/(L.d)时,pH、VFA、碱度和氨氮浓度分别保持在7.3、450mg/L、9500 mg/L和1100mg/L左右,系统能稳定运行。在有机负荷为1.25 gVS/(L.d)时条件下运行效果最佳,产气量稳定,最大日产气量为17.6L,平均产气率最大为1.78L/gVS,甲烷百分含量为60%。

A test on anaerobic digestion with a different organic load rate （OLR） for waste grease from food residue mixed with pig manure was processed in a CSTR reactor under mesophilic temperature. There were five OLR including O. 5 gVS/（ L ·d）, 0.75 gVS/（L ·d） ,1.0 gVS/（L · d）,1.25 gVS/（L ·d）and 1. 5 gVS/（L·d）. Results indicated that the system could run well and stably when the OLR was less than 1.25 gVS/（ L · d）and pH , VFA, the concentrations of alkalinity and ammonia nitrogen concentration maintained at around 7.3,450mg/L , 9500 mg/L and 1100mg/L , respectively. The system achieved the best performance with a stable biogas production under OLR of 1.25 gVS/（L · d）. The maximum daily hiogas yield and average biogas production rate were 17. 6L and 1. 78L/gVS,respectivcly , and methane content was 60%.