Wang Chuqiao, Hong Feng, Lu Yong, Li Xianning, Liu Hengming
School of Energy and Environment, Southeast University, Nanjing, China.
Ocean Science and Environment College, Dalian ocean University, Dalian, China.
PLoS One. 2017 Aug 2;12(8):e0182361. doi: 10.1371/journal.pone.0182361. eCollection 2017.
Oilseed rape straw (ORS) is a kind of biorefractory waste widely existing in the rural area of China, which is highly suitable to mix with kitchen waste (KW) and duck droppings (DD) in two-phase anaerobic digestion (AD). This research introduced the importance of KW and DD addition to improve the biogas production and biodegradation of ORS. A set of comparative experiments were conducted on two-phase mono- and co-digestion with organic load of 60 g VS/L. The total methane yield (TMY) and the biodegradation of ORS of co-digestions were obviously improving, and the synergistic effect found in the two-phase co-digestions. The optimum mixing ratio of ORS, KW and DD was 50:40:10, and the corresponding TMY and VS degradation rate of ORS were 374.5 mL/g VS and 49.7%, respectively. Addition of KW and DD maintained the pH within the optimal range for the hydrolyzing-acidification, improved the phase separation and buffering capacity of AD system.
油菜秸秆（ORS）是中国农村地区广泛存在的一种难生物降解废物，非常适合与厨余垃圾（KW）和鸭粪（DD）混合进行两相厌氧消化（AD）。本研究介绍了添加KW和DD对提高ORS沼气产量和生物降解率的重要性。在有机负荷为60 g VS/L的条件下，进行了两相单消化和共消化的一组对比实验。共消化的总甲烷产量（TMY）和ORS的生物降解率明显提高，且在两相共消化中发现了协同效应。ORS、KW和DD的最佳混合比例为50:40:10，相应的ORS的TMY和VS降解率分别为374.5 mL/g VS和49.7%。添加KW和DD可使pH维持在水解酸化的最佳范围内，提高了AD系统的相分离和缓冲能力。
