title: Biogas production from potato-juice, a by-product from potato-starch processing, in upflow anaerobic sludge blanket (UASB) and expanded granular sludge bed (EGSB) reactors.
abstract: In this study, the utilization of potato-juice, the organic by-product from potato-starch processing, for biogas production was investigated in batch assay and in high rate anaerobic reactors. The maximum methane potential of the potato-juice determined by batch assay was 470 mL-CH(4)/gVS-added. Anaerobic digestion of potato-juice in an EGSB reactor could obtain a methane yield of 380 mL-CH(4)/gVS-added at the organic loading rate of 3.2 gCOD/(L-reactor.d). In a UASB reactor, higher organic loading rate of 5.1 gCOD/(L-reactor.d) could be tolerated, however, it resulted in a lower methane yield of 240 mL-CH(4)/gVS-added. The treatment of reactor effluent was also investigated. By acidification with sulfuric acid to pH lower than 5, almost 100% of the ammonia content in the effluent could be retained during the successive up-concentration process step. The reactor effluent could be up-concentrated by evaporation to minimize its volume, and later be utilized as fertilizer.
authors: Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark.
authors: Cheng
authors: C
authors: Fang
authors: Kanokwan
authors: K
authors: Boe
authors: Irini
authors: I
authors: Angelidaki
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D005308:Fertilizers; D012722:Sewage; D011198:Solanum tuberosum
chemical_list: D056804:Biofuels; D005308:Fertilizers; D012722:Sewage