title: Effect of phosphoric acid as a catalyst on the hydrothermal pretreatment and acidogenic fermentation of food waste.
abstract: The hydrothermal method was applied to food waste (FW) pretreatment with phosphoric acid as a catalyst. The content of soluble substances such as protein and carbohydrate in the FW increased after the hydrothermal pretreatment with phosphoric acid addition (⩽5%). The SCOD approached approximately 29.0g/L in 5% phosphoric acid group, which is almost 65% more than the original FW. The hydrothermal condition was 160°C for 10min, which means that at least 40% of energy and 60% of reaction time were saved to achieve the expected pretreatment effect. Subsequent fermentation tests showed that the optimal dosage of phosphoric acid was 3% with a VFA yield of 0.763g/gVSremoval, but the increase in salinity caused by phosphoric acid could adversely affect the acidogenesis. With an increase in the quantity of phosphoric acid, among the VFAs, the percentage of propionic acid decreased and that of butyric acid increased. The PCR-DGGE analysis indicated that the microbial diversity could decrease with excessive phosphoric acid, which resulted in a low VFA yield.
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Shen
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China; CCTEG Hangzhou Environmental Research Institute, Hangzhou 311200, PR China.
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China. Electronic address: jun.yin77@gmail.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Yin
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Ting
authors.initials: T
authors.lastname: Chen
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, PR China.
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Yu
mesh_terms: D019149:Bioreactors / Q000382:microbiology; D002384:Catalysis; D005285:Fermentation; D005502:Food; D005735:Garbage; D006358:Hot Temperature; D010756:Phosphoric Acids / Q000737:chemistry*; D062611:Solid Waste / Q000032:analysis*; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*; D014867:Water / Q000737:chemistry*
chemical_list: D010756:Phosphoric Acids; D062611:Solid Waste; D014867:Water; C030242:phosphoric acid
keywords: Acidogenic fermentation; Food waste; Hydrothermal pretreatment; Microbial diversity; Phosphoric acid; Volatile fatty acids (VFAs)