Enhancing methane production from food waste with iron-carbon micro-electrolysis in a two-stage process

被引：2

作者：

Yuan, Tugui ^{[1
,2
]}

Shi, Xiaoyu ^{[1
]}

Xu, Qiyong ^{[1
]}

机构：

[1] Peking Univ Shenzhen Grad Sch, Sch Environm & Energy, Shenzhen Engn Lab Ecoefficient Recycled Mat, Shenzhen 518055, Peoples R China

[2] Beijing Univ Civil Engn & Architecture, Key Lab Urban Stormwater Syst & Water Environm, Minist Educ, Beijing 100044, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2023年 / 385卷

关键词：

Food waste; Anaerobic digestion; Methane production; Iron -carbon micro -electrolysis; Two -stage process; ZERO-VALENT IRON; SLUDGE BLANKET UASB; ANAEROBIC-DIGESTION; REACTOR; OPTIMIZATION; FE2+; PH;

D O I：

10.1016/j.biortech.2023.129474

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

A two-stage process, consisting of a leach-bed reactor (LBR) and an up-flow anaerobic sludge blanket reactor (UASB), has been commonly adopted to improve food waste anaerobic digestion. However, its application is limited due to low hydrolysis and methanogenesis efficiencies. This study proposed a strategy of incorporating iron-carbon micro-electrolysis (ICME) into the UASB and recirculating its effluent to the LBR to improve the twostage process efficiency. Results showed that the integration of the ICME with the UASB significantly increased the CH4 yield by 168.29%. The improvement of the food waste hydrolysis in the LBR mainly contributed to the enhanced CH4 yield (approximately 94.5%). The enrichment of hydrolytic-acidogenic bacterial activity, facilitated by the Fe2+ generated through ICME, might be the primary cause of the improved food waste hydrolysis. Moreover, ICME enriched the growth of hydrogenotrophic methanogens and stimulated the hydrogenotrophic methanogenesis pathway in the UASB, contributing partially to the enhanced CH4 yield.

引用

页数：9

共 45 条

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