Department of Agricultural and Biological Engineering, University of Illinois at Urbana-Champaign, 1304 W Pennsylvania Ave., Urbana, IL 61801, USA.
Department of Crop Sciences, University of Illinois at Urbana-Champaign, 1102 South Goodwin, Urbana, IL 61801, USA.
Bioresour Technol. 2015;189:62-70. doi: 10.1016/j.biortech.2015.03.069. Epub 2015 Mar 19.
This study investigated routine bioaugmentation in the acid-phase of a two-phase anaerobic digestion (AD) process treating a largely cellulosic waste material generated from sweet corn processing. A proprietary cellulolytic bioculture was used for bioaugmentation with the aim of increasing substrate hydrolysis to improve overall methanogenic efficiency. In a sequencing batch experiment routine bioaugmentation achieved significantly greater soluble chemical oxygen demand (sCOD) generation (+25%) and methane production (+15%) compared to one-time bioaugmentation. In a continuous bench-scale system, routine bioaugmentation increased acid-phase sCOD by 29-68% and acetic acid concentrations by 31-34%. This benefit to hydrolysis and acetogenesis subsequently led to sustained increase in methane production (+56%) compared to non-bioaugmentation. A cursory economic analysis indicated that routine bioaugmentation could improve the economics of corn waste AD by $27-$34/dry tonne of waste. Overall, routine bioaugmentation showed significant promise for improving AD of corn waste by achieving sustained increases in substrate hydrolysis and methane production.
本研究调查了两相厌氧消化（AD）工艺酸相中的常规生物强化处理大量来自甜玉米加工的纤维素废物的情况。使用专有的纤维素分解生物培养物进行生物强化，旨在增加底物水解以提高整体产甲烷效率。在序批式实验中，与一次性生物强化相比，常规生物强化可显著增加可溶化学需氧量（sCOD）的生成（增加 25%）和甲烷的生成（增加 15%）。在连续的 bench-scale 系统中，常规生物强化使酸相中的 sCOD 增加了 29-68%，乙酸浓度增加了 31-34%。这种对水解和产乙酸作用的促进作用随后导致与非生物强化相比，甲烷的生成持续增加（增加 56%）。粗略的经济分析表明，常规生物强化可以通过提高 27-34 美元/干吨废物的经济效益来改善玉米废物 AD。总体而言，常规生物强化通过持续增加底物水解和甲烷生成，显示出在提高玉米废物 AD 方面的巨大潜力。
