学会誌「EICA」

[研究発表] 酸発酵によって食品廃棄物から揮発性脂肪酸を回収するための生物反応モデル

内容

[研究発表] 酸発酵によって食品廃棄物から揮発性脂肪酸を回収するための生物反応モデル

巻

28巻2/3号2023年

Page

113

題名

酸発酵によって食品廃棄物から揮発性脂肪酸を回収するための生物反応モデル

Title

Control Scheme for Efficient Recovery of Volatile Fatty Acids during Anaerobic Digestion of Food Waste

著者

孫 夢，張 渓, 寺嶋光春，安井英斉

Authors

著者表記

Author attribution

Meng Sun, Xi Zhang, Mitsuharu Terashima, Hidenari Yasui

著者勤務先名

北九州市立大学<br>Faculty of Environmental Engineering, The University of Kitakyushu

Office name

著者所属名

キーワード

Key Words

anaerobic processes, food wastes, methanogens, pH inhibition, VFA recovery

概要

Abstract

By refining the existing ADM1 to incorporate a pH inhibition equation on methanogenʼs decay, the critical pH for acid failure was determined during anaerobic fermentation of food waste. The optimal operating conditions for efficient VFA recovery were established by simulating experimental data from other researchers. A range of pH parameters affecting methanogens was identified. For conservative operations, employing low pH inhibition parameters (pHUL=6.41, pHLL=5.47 and n=0.23) allows for stable methane fermentation against acid failure. On the other hand, optimistic curves (pHUL=5.55, pHLL=5.11 and n=0.24) can be utilized to decrease the specific decay rate of methanogens by 0.4 d−1, thereby promoting adequate acidification and maximizing VFA yield. Experimental results indicate that the optimal pH range for activity of acid-producing bacteria is between pH 5.5-6.2, which also benefits VFA recovery by significantly reducing VFA consumption due to acid inhibition.