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

• 作者: Cui Yue Lan Miao Liu Yanping Xiao Xiong Yuan Yu
• 来源期刊: 气象与环境研究:英文版
• 学科: 地球科学
• 关键词: KITCHEN waste ANAEROBIC DIGESTION Food to MICROORGANISM ratios
• 年，卷（期）: 2018,（6）
• 页码范围: 34-39
• 页数: 6页
• 分类号: P

摘要

The effect of F/M on acidification characteristics during anaerobic digestion of kitchen waste was investigated. Under different F/M,pH,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 process.Therefore,F/M influenced fermentation type,and it can provide a target product for subsequent methanation process by controlling F/M in a reasonable range.