Enhanced energy production and biological treatment of swine wastewater using anaerobic membrane bioreactor: Fouling mechanism and microbial community. (October 2022)

• Record Type: Journal Article
• Authors: Pu, Yunhui; Tang, Jialing; Zeng, Ting; Hu, Yisong; Wang, Qingyuan; Huang, Jin; Pan, Shengwang; Wang, Xiaochang C.; Li, Yuyou; Hao Ngo, Huu; Abomohra, Abdelfatah
• Is Part Of: Bioresource technology. Volume 362(2022)
• Publication Date: 2022-10
• Subjects: Biogas -- Waste management -- Methane -- Extracellular polymeric substances (EPS) -- Green energy; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127850
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Energy recovery from SW and membrane fouling properties in AnMBR were explored. Lower energy and higher membrane fouling rate were recorded at higher OLRs. Accumulation of fine particles and EPS in cake layer aggregates membrane fouling. Both bacteria and archaea enriched in cake layer and caused the membrane fouling. Abstract: This study aimed to reveal the membrane fouling mechanisms during anaerobic membrane bioreactor (AnMBR) operation for swine wastewater treatment under different organic loading rates (OLR). Results showed that AnMBR could achieve high pollutant removal (71.9–83.6 %) and energy recovery (0.18–0.23 L-CH4 /g-COD) at an OLR range of 0.25–0.5 g-COD/g-VSS.d, realizing energy production. However, higher OLR would aggravate the membrane fouling due to accumulation of fine sludge particles, organic foulants, and extracellular polymeric substances (EPS) on cake layer. Based on the high-throughput sequencing, microbial communities significantly changed and fouling-causing bacteria (e.g. Pseudomonas, Methanosarcina and Methanothrix ) enriched in the cake layer at higher OLR conditions, leading to lower membrane permeability. Backwash can effectively remove the cake layer from the membrane surface and recover membrane permeability. The present study provides important information about membrane fouling and microbial information that could have significant impact on large-scale AnMBR application.