Swedish Centre for Resource Recovery, University of Borås, Allégatan 1, Borås 50190, Sweden.
Department of Food and Agricultural Product Technology, Faculty of Agricultural Technology, Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia.
Membranes (Basel). 2014 Aug 27;4(3):596-607. doi: 10.3390/membranes4030596.
Rapid acidification and inhibition by d-limonene are major challenges of biogas production from citrus waste. As limonene is a hydrophobic chemical, this challenge was encountered using hydrophilic polyvinylidine difluoride (PVDF) membranes in a biogas reactor. The more sensitive methane-producing archaea were encapsulated in the membranes, while freely suspended digesting bacteria were present in the culture as well. In this membrane bioreactor (MBR), the free digesting bacteria digested the citrus wastes and produced soluble compounds, which could pass through the membrane and converted to biogas by the encapsulated cell. As a control experiment, similar digestions were carried out in bioreactors containing the identical amount of just free cells. The experiments were carried out in thermophilic conditions at 55 °C, and hydraulic retention time of 30 days. The organic loading rate (OLR) was started with 0.3 kg VS/m3/day and gradually increased to 3 kg VS/m3/day. The results show that at the highest OLR, MBR was successful to produce methane at 0.33 Nm3/kg VS, while the traditional free cell reactor reduced its methane production to 0.05 Nm3/kg VS. Approximately 73% of the theoretical methane yield was achieved using the membrane bioreactor.
从柑橘废料中生产沼气面临的主要挑战是快速酸化和被柠檬烯抑制。由于柠檬烯是一种疏水化学物质，因此在沼气反应器中使用亲水性聚偏二氟乙烯（PVDF）膜时会遇到这个挑战。更敏感的产甲烷古菌被包裹在膜内，同时游离悬浮的消化细菌也存在于培养物中。在这个膜生物反应器（MBR）中，游离的消化细菌消化柑橘废料并产生可溶解的化合物，这些化合物可以通过膜传递并被包裹的细胞转化为沼气。作为对照实验，在含有相同数量游离细胞的生物反应器中进行了类似的消化实验。实验在 55°C 的高温条件下进行，水力停留时间为 30 天。有机负荷率（OLR）从 0.3 kg VS/m3/天开始逐渐增加到 3 kg VS/m3/天。结果表明，在最高 OLR 下，MBR 成功地以 0.33 Nm3/kg VS 的产甲烷量生产甲烷，而传统的游离细胞反应器将其甲烷产量降低至 0.05 Nm3/kg VS。使用膜生物反应器可实现约 73%的理论甲烷产率。
Zotero 插件
