Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China; State Key Laboratory of Motor Vehicle Biofuel Technology, Nanyang 473000, China.
Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
Bioresour Technol. 2015 Jun;186:1-7. doi: 10.1016/j.biortech.2015.03.018. Epub 2015 Mar 9.
Floating tests were conducted in anaerobic digestion with different OLR of corn stover to investigate formation of floating layers and to find proper agitation interval for preventing floating layer formation. Floating layers were formed in the early stage of no-agitation period. The daily biogas production was decreased by 81.87-87.90% in digesters with no agitation and feeding compared with digesters having agitation. Reduction of biogas production was mainly attributed to poor contact of substrate-microorganisms. Agitation intervals of 10 h, 6 h, and 2 h were found to be proper for eliminating floating layer at OLR of 1.44, 1.78 and 2.11 g(TS) L(-1) d(-1), respectively. The proper agitation interval was further validated by anaerobic experiments. It showed that proper agitation interval could not only prevent floating layer formation and achieve high biogas production but also increase energy efficiency of anaerobic digestion. The finding is useful for operating anaerobic digester with corn stover in a cost-effective way.
进行了不同玉米秸秆 OLR 的厌氧消化浮动试验，以研究浮渣层的形成，并找到防止浮渣层形成的适当搅拌间隔。在无搅拌的无搅拌期初期形成了浮渣层。与具有搅拌的消化器相比，无搅拌和进料的消化器中的每日沼气产量减少了 81.87-87.90%。沼气产量的降低主要归因于底物-微生物之间接触不良。发现搅拌间隔为 10 h、6 h 和 2 h 分别适用于 OLR 为 1.44、1.78 和 2.11 g(TS) L(-1) d(-1)时消除浮渣层。通过厌氧实验进一步验证了适当的搅拌间隔。结果表明，适当的搅拌间隔不仅可以防止浮渣层的形成和实现高沼气产量，而且可以提高厌氧消化的能源效率。这一发现对于以具有成本效益的方式操作以玉米秸秆为原料的厌氧消化器非常有用。
