U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

Food waste fermentation in a leach bed reactor: Reactor performance, and microbial ecology and dynamics

Author:
Ziyi Xiong, Abid Hussain, Jangho Lee, Hyung-Sool Lee
Source:
Bioresource technology 2019 v.274 pp. 153-161
ISSN:
0960-8524
Subject:
Bacteroides, Bifidobacterium, Clostridium, Dysgonomonas, bacteria, bacterial communities, biodegradability, butyric acid, chemical oxygen demand, community structure, dietary fiber, food waste, leachates, mixing, pH, volatile fatty acids
Abstract:
Food waste fermentation was investigated in a leach bed reactor operated at acidic, neutral and alkaline conditions. Highest solids reduction of 87% was obtained at pH 7 in 14 days of reaction time with minimum mixing. The concentration of volatile fatty acids increased to 28.6 g COD/L under pH 7, while the highest butyric acid of 16 g COD/L was obtained at pH 6. Bacterial community structure was narrowed down to Bifidobacterium and Clostridium at pH 6, while Bacteroides and Dysgonomonas were identified as main players at both pH 7 and 8. Bacterial populations in the food residue generally reflected those in the leachate, but some bacteria were selectively enriched in the leachate or the food residue. Bacterial community dynamics suggested that biodegradable food waste was first fermented by one of dominant players (e.g., Clostridium) and the other degraded resistant dietary fibers later (e.g., Bifidobacterium, Bacteroides, Dysgonomonas).
Agid:
6233704