Impact on Acidification Characteristics of Anaerobic Digestion of Kitchen Waste by F/M

作     者：Liu Yanping Xiao Xiong Cui Yue Yuan Yu Lan Miao 

作者机构：Department of Environmental Science and EngineeringBeijing University of Chemical Technology Beijing Drainage Group Co.Ltd. 

出 版 物：《Meteorological and Environmental Research》 (气象与环境研究（英文版）)

年 卷 期：2018年第9卷第6期

页      面：34-39页

学科分类：07[理学] 

基　　金：Supported by National Science and Technology Support Program(2015BAD21B03 2014BAC24B01) 

主　　题：Kitchen waste Anaerobic digestion Food to microorganism ratios 

摘      要：The effect of F/M on acidification characteristics during anaerobic digestion of kitchen waste was investigated. Under different F/M,p H,alkalinity,ethyl alcohol,volatile fatty acids(VFAs),and biogas production status of acidification effluent in 96 h were observed. The study results showed that the content of propionic acid + acetic acid reached 56%-80% when F/M≤1. 0,which was mainly known as propionic acid type of fermentation and was accompanied by methane. The value of alkalinity was only 3 000-4 000 mg/L,which indicated that the stability was weak in the system. When 1. 0 F/M≤2. 5,the concentration of butyric acid + acetic acid was in the range of 77%-85%,and acid production rate per unit load was more than 250 mg VFAs/g VS,which was known as butyric acid type of fermentation. The fermentation type was stable and could provide more available VFAs for subsequent methanation processes because the value of alkalinity reached 5 650 mg/L. When F/M≥2. 5,the content of ethanol + acetic acid was 80%-92%,which was known as ethanol type of fermentation. And p H of 96 h was only 5. 0( F/M = 3. 0) and 4. 3(F/M =4.0),and acidification was serious and the stability was weak in the system,which would hinder the subsequent methanation ***,F/M influenced fermentation type,and it can provide a target product for subsequent methanation process by controlling F/M in a reasonable range.