Guangdong Research Institute of Petrochemical and Fine Chemical Engineering, Guangzhou, 510665, Guangdong, China.
Guangdong Provincial Key Laboratory of Industrial Surfactant, Guangzhou, 510665, Guangdong, China.
Appl Biochem Biotechnol. 2019 May;188(1):185-193. doi: 10.1007/s12010-018-2910-4. Epub 2018 Nov 7.
Vegetable and fruit waste (VFW) is becoming a heavy burden of municipal waste disposal because of its huge amount, but it is a potentially valuable resource that can be developed into high value products such as methane. Conventional anaerobic digestion processes are not suitable for solving the problem of easy acidification of VFW. Thus, a two-stage laboratory-scale anaerobic digestion system was assembled for waste reduction and biogas production of VFW in the mesophilic temperatures. The biphasic system consists of a 70-L leach bed reactor (LBR) and a 35-L continuous stirred tank reactor (CSTR). Water is sprinkled over the material to enhance the extraction process of acidification phase. The leachate was then transferred to the CSTR for biogas production. Batch digestion was lasted 120 h until no biogas was produced. Leachate with a volatile fatty acid (VFA) concentration of 7.6 g/L was obtained within 10 h. The results showed that overall 70.9% of the volatile solids (VS) was removed in the solid-phase system. Over 90% of VFAs were reduced in the methanogenic reactor, and it has been observed that the maximum biogas production rate was 51.26 mL/(d gVS). The maximum methane concentration in the produced biogas was 71%.
蔬菜和水果废物（VFW）因其数量巨大而成为城市废物处理的沉重负担，但它是一种潜在的有价值资源，可以开发成高价值产品，如甲烷。传统的厌氧消化工艺不适合解决 VFW 易酸化的问题。因此，组装了一个两相实验室规模的厌氧消化系统，用于中温下 VFW 的废物减少和沼气生产。该两相系统由一个 70 升的渗滤床反应器（LBR）和一个 35 升的连续搅拌罐反应器（CSTR）组成。向物料上喷水以增强酸化相的提取过程。渗滤液然后被转移到 CSTR 中以生产沼气。批式消化持续了 120 小时，直到不再产生沼气。在 10 小时内获得了挥发性脂肪酸（VFA）浓度为 7.6 g/L 的渗滤液。结果表明，固相系统中挥发性固体（VS）的总体去除率为 70.9%。在产甲烷反应器中，超过 90%的 VFAs 被还原，并且已经观察到最大的沼气产生速率为 51.26 mL/（d gVS）。所产生沼气中的最大甲烷浓度为 71%。
