Cathodic bacterial community structure applying the different co-substrates for reductive decolorization of Alizarin Yellow R

Abstract

h i g h l i g h t sFeeding with glucose obtained higher AYR decolorization efficiency than acetate. Diverse cathodic bacterial communities were observed with different co-substrates. Glucose-fed condition was dominated with Citrobacter, Enterococcus and Alkaliflexus. Acetate-fed condition was dominated with Acinetobacter and Achromobacter. Co-substrate types impacted performance and the cathodic bacterial communities. a r t i c l e i n f o t r a c tSelective enrichment of cathodic bacterial community was investigated during reductive decolorization of AYR fedding with glucose or acetate as co-substrates in biocathode. A clear distinction of phylotype structures were observed between glucose-fed and acetate-fed biocathodes. In glucose-fed biocathode, Citrobacter (29.2%), Enterococcus (14.7%) and Alkaliflexus (9.2%) were predominant, and while, in acetate-fed biocathode, Acinetobacter (17.8%) and Achromobacter (6.4%) were dominant. Some electroactive or reductive decolorization genera, like Pseudomonas, Delftia and Dechloromonas were commonly enriched. Both of the higher AYR decolorization rate (k AYR = 0.46) and p-phenylenediamine (PPD) generation rate (k PPD = 0.38) were obtained fed with glucose than acetate (k AYR = 0.18; k PPD = 0.16). The electrochemical behavior analysis represented a total resistance in glucose-fed condition was about 73.2% lower than acetate-fed condition. The different co-substrate types, resulted in alteration of structure, richness and composition of bacterial communities, which significantly impacted the performances and electrochemical behaviors during reductive decolorization of azo dyes in biocathode.

Biodegradation of diethyl terephthalate and polyethylene terephthalate by a novel identified degraderDelftiasp. WL-3 and its proposed metabolic pathway

“…), azo dyes (Sun et al . ), etc. However, to our best knowledge, this study is the first report on a strain of Delftia with DET‐degrading ability.…”

“…Members of the Delftia genus were reported to degrade many environmental pollutants, such as aniline (Zhang et al 2008), terephthalate (Shigematsu et al 2003), para-hydroxybenzoate (Patil et al 2006), azo dyes (Sun et al 2016), etc. However, to our best knowledge, this study is the first report on a strain of Delftia with DET-degrading ability.…”

Electron Fluxes in Biocathode Bioelectrochemical Systems Performing Dechlorination of Chlorinated Aliphatic Hydrocarbons

“…When biocathode was switched from heterotrophic to autotrophic (NaHCO 3 -fed) cultivation without external electron donor, E 24h could still be maintained at 85.0 ± 2.0%, 91.4 ± 1.8% and 84.9 ± 3.1% for PCE, TCE, and 1,2-DCA, respectively. This verified that the cathodic biofilm could utilize electrode as the sole electron donor for CAHs dechlorination and use these electrons to build up a transmembrane electrochemical gradient ( Rabaey and Rozendal, 2010 ; Liang et al, 2014 ; Sun et al, 2016 ). The NaAc- and NaHCO 3 -fed biocathode had the same cathodic potential of −0.26 V and the initial reaction currents of both were similar ( Figure 1 ).…”

Durability and regeneration of activated carbon air-cathodes in long-term operated microbial fuel cells

“…Microbial community analysis indicated that Proteiniphilum (13.18%) and Pseudomonas (12.42%) were the dominant bacterial genera in the cathodic biofilms formed over one year whereas Geobacter (27.37%) and Flavobacterium (10.59%) were most enriched in anodic biofilms (Table 2). Pseudomonas were well known to be exoelectrogenic genus, and the species from Pseudomonas were commonly enriched in anodic biofilms (Nor et al, 2015) and cathodic biofilms (Sun et al, 2016). Proteiniphilum genus was reported to be dominant in the anodic bacterial community in a methane-producing microbial electrolysis cell (Zeppilli et al, 2015), but was found to be the most enriched genus in the present cathodic biofilms.…”