用于牛粪液厌氧消化的推流式和完全混合式反应器性能研究

李荣平; 李秀金; Shulin Chen

用于牛粪液厌氧消化的推流式和完全混合式反应器性能研究

Performance evaluation of anaerobic digestion of dairy manure in plug flow reactor and continuous stirred tank reactor

摘要

摘要: 对推流式反应器(PFR)和完全混合式反应器(CSTR)用于牛粪液厌氧消化的性能进行了比较研究。在中温35℃下，对进料浓度40、80和128 g/L的3种牛粪液分别进行了试验。结果表明，CSTR比PFR具有更好的去除VS(挥发性固体)和产生物气的性能，在进料浓度为40、80和128 g/L时，CSTR中VS去除率比PFR中分别提高了17.4%～21.5%，3.9%～21.5%和0.5%～5.3%。在最优进料浓度80 g/L下，CSTR获得了最高的容积产气率和单位VS产气量，比PFR中提高了9.8%～25.9%。研究认为，CSTR中的搅拌作用加强了微生物与物料之间物质的传递，提高了降解去除有机物和产生物气的消化效果。因此，在牛粪液厌氧消化时，推荐使用CSTR反应器。

Abstract: Plug flow reactor(PFR) and Continuous stirred tank reactor(CSTR) were studied to compare their performance for treating dairy manure. Three solid concentrations of dairy manure slurry of 40, 80 and 128 g/L were tested at mesophilic temperature of 35℃. The results showed that CSTR had better treatment performance of VS removal and biogas production than PFR. VS removal efficiencies in CSTR were increased by 17.4%～21.5%, 3.9%～21.5%, and 0.5%～5.3% as compared with those in PFR at 40, 80 and 128 g/L concentrations, respectively. The influent concentration of 80 g/L was believed to be the optimal one in this study in terms of gas production, in which CSTR achieved the highest gas productivity and gas yield, 9.8%～25.9% higher than those in PFR. Based on the current results, it could be concluded that mixing in CSTR could enhance the mass transfer between microorganisms and substrate, and improve the effects of organic matter removal and gas production. CSTR was recommended in the anaerobic digestion of dairy manure.

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