Sulfate reduction and elemental sulfur recovery using photoelectric microbial electrolysis cell

Simultaneous removal of nitrate and sulfate using an up-flow three-dimensional biofilm electrode reactor: Performance and microbial response

“…Firmicutes, Bacteroidetes and Euryarchaeota were the following dominant phyla in R1.L and R1.U. Bacteroidetes was also commonly observed like Proteobacteria in activated sludge wastewater treatment (Liu et al, 2020). Firmicutes and Euryarchaeota were belonged to SRB and archaea, respectively, and they could reduce sulfate to sulfide using organic matter or hydrogen (Hamilton et al, 2016).…”

“…The extracted genomic DNA was amplified with primers 515F and 806R PCR in the V4 region of 16S rRNA gene. The PCR amplification and microbial analysis were based on the procedures described in previous study (Liu et al, 2020). The removal efficiency (E) showing the percentage of target contaminants removed from influent was calculated as Eq.…”

“…The Fig. 4 showed the microbial abundance under influent sulfate 250 mg/L, current 240 mA and HRT 18 h. At the phylum level, Proteobacteria was the predominant phylum in R1.L and R1.U, which played an important role in carbon, nitrogen, sulfur and phosphorus cycles in wastewater treatment (Hamilton et al, 2016;Liu et al, 2020). Firmicutes, Bacteroidetes and Euryarchaeota were the following dominant phyla in R1.L and R1.U.…”

“…In R1.L, the dominant genera were Dechloromonas (21.57%), Dethiobacter (18.20%), Thauera (17.20%) and Azonexus (10.51%), followed by Desulfovibrio, Sulfurospirillum, Thermomonas and Dechlorobacter. Dechloromonas played the key role of denitrifying phosphorus removal in the anoxic condition (Liu et al, 2020). The genus Thauera was widely found in denitrifying reactor because it could use various electron donors (hydrogen, organic matter or sulfide) to perform denitrification (Mao et al, 2013).…”

Effect of substrate ratios on the simultaneous carbon, nitrogen, sulfur and phosphorous conversions in microbial fuel cells

“…Studies have shown that MFCs can use NO 3 - as a cathodic electron acceptor, allowing the simultaneous C removal at the anode and N at the cathode ( Ge et al., 2020 ; Vijay et al., 2020 ; Deng et al., 2018 ; Kelly and He, 2014 ). Biological sulfur removal can also be accomplished in a MFC ( Li et al., 2021 ; Cai et al., 2017 ; Luo et al., 2020 ). Phosphorous was demonstrated to be recovered in a MFC ( Huang et al., 2017 ; Geng et al., 2018 ; Liu et al., 2018 ).…”