The ins and outs of photo-assisted microbial electrochemical systems for synchronous wastewater treatment and bioenergy recovery

Renewable electron-driven bioinorganic nitrogen fixation: a superior route toward green ammonia?

“…As increasingly sophisticated extracellular electron transfer mechanisms are investigated in the biotechnology application of electromicrobiology, 54,55 the e-BNF routes provide an alternative avenue to synthesize ammonia. Compared to other approaches, e-BNF empowers unique merits of potentially sustainable, widespread scopes of the feed substrates, ambient reaction conditions, high selectivity, and high energy efficiency.…”

“…51,52 The following criteria are typically taken into consideration for the determination of exogenous mediators: (i) widely accessible or simply producible via electrochemistry, (ii) electropositive enough to reduce NAD(P)H directly for effective energy transfer to cellular metabolism, and (iii) highly soluble in aquatic solution and non-highly toxic. 53 As increasingly sophisticated extracellular electron transfer mechanisms are investigated in the biotechnology application of electromicrobiology, 54,55 the e-BNF routes provide an alternative avenue to synthesize ammonia. Compared to other approaches, e-BNF empowers unique merits of potentially sustainable, widespread scopes of the feed substrates, ambient reaction conditions, high selectivity, and high energy efficiency.…”

Improved Fe(II) regeneration from actual ferric sludge using a biocathode with granular sludge

“…However, the current efficiency for Fe(II) regeneration increased to 23% in granular-sludge biocathode (this work), which was 2.5 times that of the previous work. The degradation of organic pollutants in the anode wastewater of MEC could provide the current for the biocathode (Yi et al, 2022). The enhancement of current efficiency significantly improved the conversion of organic pollutants and ferric sludge waste into a Fe(II) solution resource.…”

Making chemicals from the air: the new frontier for hybrid electrosyntheses in artificial tree-like devices

“…- the abilities of microbial processes in constructing complex molecules such as carbohydrates or proteins, eventually assisted by photo/electro components to bypass limitations by using co-enzymes (NADH and ATP) and allow process intensification. 17–21…”

“…-the abilities of microbial processes in constructing complex molecules such as carbohydrates or proteins, eventually assisted by photo/electro components to bypass limitations by using co-enzymes (NADH and ATP) and allow process intensification. [17][18][19][20][21] A hybrid artificial tree-like device Combining several artificial-leaf elements would allow the creation of an artificial tree-like device where the "leaf" represents the photoelectrocatalytic elements and the "branches and trunk" are the elements for distribution/collection and to host the other elements, such as the microbial reactor, which cannot be integrated directly in the leaves. A schematic presentation of this conceptual approach to making chemicals from the air in a hybrid artificial-tree-type device is presented in Fig.…”