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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

Civil engineering, surveying & building --- Gas Fermentation --- Bioelectrochemical Systems --- Microbial Electrosynthesis --- Electrofermentation --- Biosynthesis --- Gas Fermentation --- Bioelectrochemical Systems --- Microbial Electrosynthesis --- Electrofermentation --- Biosynthesis

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Microbial electrochemical systems (MESs, also known as bioelectrochemical systems (BESs) are promising technologies for energy and products recovery coupled with wastewater treatment, and have attracted increasing attention. Many studies have been conducted to expand the application of MESs for contaminants degradation and bioremediation, and increase the efficiency of electricity production by optimizing architectural structure of MESs, developing new electrode materials, etc. However, one of the big challenges for researchers to overcome, before MESs can be used commercially, is to improve the performance of the biofilm on electrodes so that ‘electron transfer’ can be enhanced. This would lead to greater production of electricity, energy or other products. Electrochemically active microorganisms (EAMs) are a group of microorganisms which are able to release electrons from inside their cells to an electrode or accept electrons from an electron donor. The way in which EAMs do this is called ‘extracellular electron transfer’ (EET). So far, two EET mechanisms have been identified: direct electron transfer from microorganisms physically attached to an electrode, and indirect electron transfer from microorganisms that are not physically attached to an electrode. 1) Direct electron transfer between microorganisms and electrode can occur in two ways: a) when there is physical contact between outer membrane structures of the microbial cell and the surface of the electrode, b) when electrons are transferred between the microorganism and the electrode through tiny projections (called pili or nanowires) that extend from the outer membrane of the microorganism and attach themselves to the electrode. 2) Indirect transfer of electrons from the microorganisms to an electrode occurs via long-range electron shuttle compounds that may be naturally present (in wastewater, for example), or may be produced by the microorganisms themselves. The electrochemically active biofilm, which degrades contaminants and produces electricity in MESs, consists of diverse community of EAMs and other microorganisms. However, up to date only a few EAMs have been identified, and most studies on EET have focused on the two model species of Shewanella oneidensis and Geobacter sulfurreducens.

extracellular electron transfer --- bioelectrochemical systems (BESs) --- Microbial electrochemical systems (MESs) --- Electrochemically active microorganisms (EAMs)

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Microbial electrochemical systems (MESs, also known as bioelectrochemical systems (BESs) are promising technologies for energy and products recovery coupled with wastewater treatment, and have attracted increasing attention. Many studies have been conducted to expand the application of MESs for contaminants degradation and bioremediation, and increase the efficiency of electricity production by optimizing architectural structure of MESs, developing new electrode materials, etc. However, one of the big challenges for researchers to overcome, before MESs can be used commercially, is to improve the performance of the biofilm on electrodes so that ‘electron transfer’ can be enhanced. This would lead to greater production of electricity, energy or other products. Electrochemically active microorganisms (EAMs) are a group of microorganisms which are able to release electrons from inside their cells to an electrode or accept electrons from an electron donor. The way in which EAMs do this is called ‘extracellular electron transfer’ (EET). So far, two EET mechanisms have been identified: direct electron transfer from microorganisms physically attached to an electrode, and indirect electron transfer from microorganisms that are not physically attached to an electrode. 1) Direct electron transfer between microorganisms and electrode can occur in two ways: a) when there is physical contact between outer membrane structures of the microbial cell and the surface of the electrode, b) when electrons are transferred between the microorganism and the electrode through tiny projections (called pili or nanowires) that extend from the outer membrane of the microorganism and attach themselves to the electrode. 2) Indirect transfer of electrons from the microorganisms to an electrode occurs via long-range electron shuttle compounds that may be naturally present (in wastewater, for example), or may be produced by the microorganisms themselves. The electrochemically active biofilm, which degrades contaminants and produces electricity in MESs, consists of diverse community of EAMs and other microorganisms. However, up to date only a few EAMs have been identified, and most studies on EET have focused on the two model species of Shewanella oneidensis and Geobacter sulfurreducens.

extracellular electron transfer --- bioelectrochemical systems (BESs) --- Microbial electrochemical systems (MESs) --- Electrochemically active microorganisms (EAMs)

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This book collects the peer-reviewed contributions accepted for the publication in the Special Issue “Advances in In Situ Biological and Chemical Groundwater Treatment” of the MDPI journal Water. As such, the contributions refer to a variety of widespread pollutants (chlorinated ethenes, chlorinated phenols, chromium, copper, nickel, and arsenic phenols) and new remediation approaches (bioremediation, bioelectrochemical systems, and sorption), covering lab and field studies.

Research & information: general --- microplastic --- bioplastic --- chlorinated phenols --- sorption --- kinetics --- matrix effect --- arsenic --- phosphate --- competitive surface complexes --- release --- mobility --- remediation --- magnetite nanoparticles --- onion peel --- corn silk --- adsorption --- groundwater --- chlorinated solvents --- biological reductive dechlorination --- aerobic oxidation --- qPCR --- ethenotrophs --- methanotrophs --- bioelectrochemical systems (BESs) --- hexavalent chromium --- electrobioremediation --- groundwater treatment --- heavy metals --- carbon nanotubes --- adsorption mechanism

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The development of effective treatment methods or the synthesis of new effective adsorbents capable of selective sorption of toxic substances is now of great importance. This reprint contains articles focused on wastewater treatment containing heavy metal ions, and hormones from synthetic and real solutions using different types of adsorbent, such as synthetic ion exchangers, natural and synthetic aluminosilicates, zeolites, magnetic multiwall carbon nanotubes, biosorbents, imprinted polymers, and magnetic adsorbents, as well as cost estimation of activated carbon production from waste nutshells by physical activation could be found.

Technology: general issues --- History of engineering & technology --- Environmental science, engineering & technology --- economic evaluation --- production cost --- nutshell waste --- activated carbon --- magnetic multiwall carbon nanotube --- adsorption --- kinetics --- isotherm --- thermodynamic --- lead --- date seeds --- thermodynamics --- T. longibrachiatum --- T. fasciculatum --- bioadsorption --- cadmium --- heavy metals --- isotherms --- bioadsorption mechanism --- mycoremediation --- amino group --- kinetic --- multifunction --- cation --- anion --- β-estradiol --- akaganeite nanorods --- adsorptive removal --- endocrine disruptors --- desirability function --- divalent cobalt --- Lemna gibba --- biosorption --- desorption --- SEM-EDX --- androgenic hormones --- solid-phase extraction --- molecularly imprinted polymers --- trenbolone --- nickel removal --- ion exchangers --- water pollution --- Lewatit MonoPlus TP220 --- lead (II) --- Azadirachta indica leaves --- water --- metals --- smectite --- kaolinite --- zeolites --- nanomaterials --- remediation --- bioelectrochemical systems --- wastewater --- nanocomposites