Boe Kanokwan, Angelidaki Irini
Department of Environmental Engineering, Technical University of Denmark, Miljoevej Building 113, DK-2800 Kgs. Lyngby, Denmark.
Water Res. 2009 Jan;43(1):166-72. doi: 10.1016/j.watres.2008.09.041. Epub 2008 Oct 17.
A new configuration of manure digesters for improving biogas production has been investigated in laboratory scale. A single thermophilic continuous-flow stirred tank reactor (CSTR) operated with a hydraulic retention time (HRT) of 15 days was compared to a serial CSTR configuration with volume distribution ratio of 80/20 and 90/10, and total HRT of 15 days. The results showed that the serial CSTR could obtain 11% higher biogas yield compared to the single CSTR. The increased biogas yield in the serial CSTR was mainly from the second reactor, which accounted for 16% and 12% of total biogas yield in the 90/10 and 80/20 configuration, respectively. VFA concentration in the serial CSTR was high in the first reactor but very low in the second reactor. The results from organic pulse load test showed that the second reactor in serial CSTR helped utilizing VFA produced from overloading in the first reactor, which improved the effluent quality and conversion efficiency of the serial CSTR.
在实验室规模下，对一种用于提高沼气产量的新型沼气池配置进行了研究。将一个水力停留时间（HRT）为15天的单级嗜热连续流搅拌槽式反应器（CSTR）与体积分布比为80/20和90/10且总HRT为15天的串联CSTR配置进行了比较。结果表明，与单级CSTR相比，串联CSTR的沼气产量可提高11%。串联CSTR中沼气产量的增加主要来自第二个反应器，在90/10和80/20配置中，其分别占总沼气产量的16%和12%。串联CSTR中VFA浓度在第一个反应器中较高，但在第二个反应器中非常低。有机脉冲负荷试验结果表明，串联CSTR中的第二个反应器有助于利用第一个反应器中因过载产生的VFA，从而提高了串联CSTR的出水质量和转化效率。
