School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China.
Environ Res. 2020 Sep;188:109743. doi: 10.1016/j.envres.2020.109743. Epub 2020 Jun 8.
Alkali pretreatment of anaerobic digestion (AD) was investigated as a strategy to degrade complex organic matter such as fats. AD of food waste (FW) with alkali pretreatment was conducted using batch assays and long-term experiments for 70 days in two reactors. The aim of this study was to compare the impact of alkali pretreatment on solubilization and biogas production and to evaluate the performance in reactors with that of the untreated FW. The alkali pretreatment enhanced the solubilization of organic matter. The best biogas yield (829 mL/g VS) and methane content (65.48%) were obtained by the pretreatment with 1% CaO with the highest P (66.06%) of biodegradable soluble materials. The long-term reactors with pretreatment performed more steadily with higher biogas production under organic loading rates (OLR) over 5 g VS/(L⋅d). The bacterial community structure was different under various conditions. Methanosaeta and Methanospirillum were the dominant archaea in this study, while Methanosaeta increased in R1 at OLR of 6 g VS/(L⋅d). The study concluded that alkali pretreatment with 1% CaO appeared as a potential strategy for AD of FW.
碱预处理厌氧消化（AD）被研究为一种降解脂肪等复杂有机物的策略。使用批式实验和两个反应器中的 70 天长期实验对经过碱预处理的食物垃圾（FW）进行 AD。本研究旨在比较碱预处理对有机物的溶解和沼气产量的影响，并评估未经处理的 FW 在反应器中的性能。碱预处理增强了有机物的溶解。用 1%CaO 预处理可获得最佳的沼气产率（829 毫升/克 VS）和甲烷含量（65.48%），可生物降解可溶性物质的 P（66.06%）最高。预处理后的长期反应器在有机负荷率（OLR）超过 5 克 VS/（L·d）时，沼气产量更高，运行更稳定。在不同条件下，细菌群落结构不同。本研究中，产甲烷菌和甲烷螺菌是主要的古菌，而在 OLR 为 6 克 VS/（L·d）的 R1 中，产甲烷菌增加。研究结论认为，1%CaO 的碱预处理似乎是 FW 的 AD 的一种有潜力的策略。
