Bioproducts, Sciences and Engineering Laboratory, Washington State University, Tri-Cities, Richland, WA 99354, United States; Biological Systems Engineering, Washington State University, Pullman, WA 99163, United States.
Bioproducts, Sciences and Engineering Laboratory, Washington State University, Tri-Cities, Richland, WA 99354, United States; Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Pullman, WA 99163, United States; Biological Systems Engineering, Washington State University, Pullman, WA 99163, United States.
Bioresour Technol. 2021 Feb;321:124427. doi: 10.1016/j.biortech.2020.124427. Epub 2020 Nov 20.
Anaerobic digestion of animal manure show a maximum of ca. 50% conversion of volatile solids due to recalcitrance of lignin and crystalline cellulose under anaerobic conditions. The aim of this study is to evaluate different pretreatments on anaerobic digestion of manure fibers after anaerobic digestion. Physical, chemical, thermal, and thermal combined with alkaline pretreatments using sodium hydroxide were tested on manure fiber fraction separated out after anaerobic digestion of cow manure. The anaerobic digestion after pretreatment along with untreated controls were done in semi-continuous anaerobic bioreactors. All pretreatments showed positive effect and the highest increase in VS conversion (42.4%) and methane yield (ca. 127%) was found for 3% NaOH pretreated sample at 180 °C. Composition analysis showed that cellulose, hemicellulose and lignin in digested manure fibers were optimally reduced by 24.8, 29.1 and 9.5% respectively during pretreatment and 76.5% of cellulose and 84.9% of hemicellulose was converted to methane during AD.
动物粪便的厌氧消化由于木质素和结晶纤维素在厌氧条件下的顽固性，最大转化率约为挥发性固体的 50%。本研究的目的是评估不同预处理方法对厌氧消化后粪便纤维的厌氧消化的影响。在奶牛粪便厌氧消化后分离出的粪便纤维部分进行了物理、化学、热和热与碱性（氢氧化钠）联合预处理的测试。预处理后的厌氧消化以及未经处理的对照均在半连续厌氧生物反应器中进行。所有预处理均显示出积极的效果，在 180°C 下，3%NaOH 预处理的样品的 VS 转化率（42.4%）和甲烷产量（约 127%）最高。组成分析表明，在预处理过程中，消化后的粪便纤维中的纤维素、半纤维素和木质素分别被最佳地减少了 24.8%、29.1%和 9.5%，而在 AD 过程中，76.5%的纤维素和 84.9%的半纤维素被转化为甲烷。
