New insights into enhanced anaerobic degradation of coal gasification wastewater (CGW) with the assistance of graphene. (August 2018)

• Record Type: Journal Article
• Authors: Zhu, Hao; Han, Yuxing; Ma, Wencheng; Han, Hongjun; Ma, Weiwei; Xu, Chunyan
• Is Part Of: Bioresource technology. Volume 262(2018)
• Page Start: 302
• Page End: 309
• Publication Date: 2018-08
• Subjects: Graphene -- UASB -- Coal gasification wastewater -- Direct interspecies electron transfer; 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.2018.04.080
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The UASB system with graphene assisted was applied to CGW treatment. The graphene added could enhance pollutants removal and methane production rate. Graphene promotes microbes accumulation, enzymes activity and sludge granulation. Geobacter and Pseudomonas might perform DIET with Methanosaeta . Abstract: The up-flow anaerobic sludge blanket (UASB) system with graphene assisted was developed for coal gasification wastewater (CGW) treatment. Short-term results showed that optimal graphene addition (0.5 g/L) resulted in a more significant enhancement of methane production and chemical oxygen demand (COD) removal compared with that of the optimal activated carbon addition (10.0 g/L). Long-term results demonstrated that COD removal efficiency and methane production rate with graphene assisted achieved 64.7% and 180.5 mL/d, respectively. In addition, graphene could promote microbes accumulation and enzymes activity, resulting in higher extracellular polymeric substances (EPS) and coenzyme F420 concentrations. X-ray Diffraction (XRD) analysis indicated that chemical of graphene changed insignificantly during the experiment. Meanwhile, with graphene assisted, cells were attached together to form microbial aggregates to facilitate sludge granulation process. Furthermore, the enriched Geobacter and Pseudomonas might perform direct interspecies electron transfer (DIET) with Methanosaeta via biological electrical connection, enhancing the anaerobic degradation of CGW.