Enhanced anaerobic digestion for degradation of swine wastewater through a Fe/Ni-MOF modified microbial electrolysis cell. (20th December 2022)

• Record Type: Journal Article
• Authors: Wang, Chengcheng; Ye, Xiaomei; Liu, Yang; Jia, Zhaoyan; Cao, Chunhui; Xiao, Qingbo; Du, Jing; Kong, Xiangping; Wu, Xiayuan; Chen, Zhongbing; Xi, Yonglan
• Is Part Of: Journal of cleaner production. Volume 380:Part 1(2022)
• Publication Date: 2022-12-20
• Subjects: Microbial electrolytic cell -- Anaerobic digestion -- Metal organic framework -- Swine wastewater -- Methane; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.134773
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Stainless steel mesh, as the common cathode of microbial electrolytic cell-assisted anaerobic digestion (MEC-AD), has the disadvantages of low specific surface area, poor biocompatibility and low catalytic activity, which limits the production of methane. Metal-organic frameworks (MOFs) have attracted much attention due to their adjustable pores and specific catalytic properties. However, little attention was paid to the combination of MOF and stainless-steel mesh to improve the performance of MEC-AD cathode. In this study, we combined stainless steel mesh with bimetallic MOF catalyst (Fe/Ni–NH2 BDC) to prepare a composite cathode, and verified its promoting effect on AD of swine wastewater. The experimental results showed that the reactor with the carbonized MOF composite cathode (FeNi2 -PAN2) achieved the highest soluble chemical oxygen demand removal rate of 82.92% and a maximum cumulative methane yield of 213.47 mL CH4 /g COD under an applied voltage of 0.8 V, which were 33.14% and 57.56% higher than those of an anaerobic digestion (AD) control reactor, respectively, and higher than those of a carbon paper (CP) cathode reactor. The enrichment of Methanobacterium and Methanoculleus on the surface of FeNi2 -PAN2 cathode surface indicated that FeNi2 -PAN2 cathode enhanced hydrogenotrophic methanogenesis and improved the stability of AD. Graphical abstract: Image 1 Highlights: SSM-wrapped Fe/Ni-MOF cathode used for MEC-AD of swine wastewater. FeNi2 -PAN2 cathode improved the SCOD degradation and methane formation. Carbonized FeNi2 -PAN2 cathode formed thicker biofilms. More hydrogenotrophic methanogens were enriched in FeNi2 -PAN2 cathode.