Methods, systems, and compositions for oxidation are provided. The method comprises combining a macrocyclic ligand and metal complex catalyst, an electrolyte, the substrate, and water to form an aqueous composition. The method comprises applying an electrical voltage to the aqueous composition and oxidizing the substrate in the presence of the catalyst.

A system for per- and poly-fluoroalkyl substance degradation includes an outer housing and a porous article, which includes a piezoelectric material. The porous article has a porosity in a range from 40% to 90% and a piezoelectric constant d31 in a range from 5 pC/N to 150 pC/N.

Electrolytic liquid generation device includes stacked body in which conductive membrane is interposed between cathode and anode constituting electrodes, electrolytic part that electrolyzes a liquid, and housing in which electrolytic part is disposed. Housing includes flow path in which a liquid flowing direction intersects a stacking direction of stacked body. Electrolytic part includes slot open to flow path in which a part of interface between conductive membrane and the electrode is exposed. In housing, positioning member is disposed, and positioning member positions the electrode. This configuration provides electrolytic liquid generation device in which an electrode can be downsized and the electrode can be positioned in housing.

Systems and methods for treating water containing TOC and PFAS are disclosed. An electrochemical cell may be used to concentrate the PFAS via foam fractionation. The electrochemical cell may destroy TOC and some PFAS compounds. A downstream mineralization process may destroy PFAS compounds in the foam fraction.

A system and a method for removing gas field chemicals from a feed stream are provided. An exemplary method includes performing a forward osmosis on a feed stream including gas field chemicals to form a concentrated feed stream, and treating the concentrated feed stream in an electrochemical process to form treated water.

A method of making a photocatalyst including heating asphaltenes to 400-600 C. under nitrogen for at least 30 minutes to form heated asphaltenes, mixing a hydroxide with the heated asphaltenes, and heating to a temperature of 700-900 C. under nitrogen for at least 1 hour to form reacted asphaltenes. Further, the method includes oxidizing the reacted asphaltenes with an oxidant to form a porous carbon. Finally, the method includes calcining the porous carbon with bismuth oxide and titanium dioxide at a temperature of 600-800 C. to form the photocatalyst.

A coated optical fiber includes a polymeric side-emitting optical fiber, a cladding along a length of the polymeric side-emitting optical fiber, an electrically conductive nanomaterial in contact with the cladding, and a coating over the cladding. The coating includes a photocatalyst.

A method of destroying a fluorocarbon compound includes regenerating an adsorbent to remove the fluorocarbon compound and to produce a regeneration fluid having a concentration of the fluorocarbon compound and directing the regeneration fluid to an electro-oxidation system. The method also includes applying a current to the electro-oxidation system to oxidize the fluorocarbon compound within the regeneration fluid and measuring a quantity of fluorides in the regeneration fluid to determine the progress of the removal of the fluorocarbon compound from the regeneration fluid.

The invention relates to a method and a plant for treating wastewater and associated sludge that makes it possible to eliminate the carbon and nitrogen with maximization of biogas production. The method comprises: (a) a step of treating wastewater producing a first effluent (2) having a reduced content of carbonaceous material and a second effluent (3) having an increased content of carbonaceous material, (b) a step of treating at least one portion of the first effluent producing a third effluent (4) having a reduced nitrogen content, carried out without use of a biological nitrification under aerobic conditions and comprising of at least one step electro-oxidation during which at least one portion of the ammonium ions contained in the first effluent are oxidized to nitrites and/or nitrates, and/or to dinitrogen, (c) a step of anaerobic digestion of the second effluent to produce biogas (7) and a digestate (8).

The present invention is directed to a method to prepare a graphene coated sponge comprising: filling mineral wool with a solution comprising graphene material by successive squeezing to obtain a mineral wool soaked with graphene material; transferring the mineral wool soaked with graphene material into a hydrothermal reactor and submitting it to heating from 60 to 240 C. for 5 minutes to 72 hours to have graphene material bonded to mineral wool and cleaning the heated material to remove the unbonded graphene material and reaction by-products from the graphene coated mineral wool. The present invention also relates to a graphene coated sponge obtained by the mentioned method and the use of such graphene sponge as water-treating agent.