Abstract:
An electroreductive and regenerative system includes an electrochemical reduction reactor having a housing and a reactor inlet. A cathode and an anode are disposed at least partially within a fluid flow-path. A spent ion-exchange resin slurry delivery inlet is fluidly connected to the reactor inlet. The spent ion-exchange resin slurry delivery inlet is connected to a source of spent ion-exchange slurry. A method of concurrently electroreductively remediating poly- and perfluorinated alkyl substances (PFAS) and regenerating an ion-exchange resin material includes providing an electrolyte-containing spent ion-exchange resin slurry, the spent ion-exchange resin slurry comprising a plurality of PFAS molecules immobilized on a surface of an ion-exchange resin material in the electrolyte containing spent ion-exchange resin slurry, and directing the electrolyte-containing, spent ion-exchange resin slurry through an electrochemical reduction reactor to remediate PFAS and form regenerated ion-exchange resin material in a regenerated ion-exchange material slurry.
Abstract:
Disclosed is an electrified membrane flow-cell reactor system and method for nitrogen wastewater treatment and upcycling towards ammonia nitrogen without external acid/base consumption. This electrified membrane flow-cell reactor includes a cathodic membrane module having a gas-permeable or gas-exchange membrane and a cathodic catalytic layer, an anode, and a semi-permeable membrane between the cathodic and anodic chamber. Three chambers in the flow-cell reactor include (i) a cathode chamber for nitrate reduction and upcycling towards NH3, (ii) a trap chamber for NH3 capture and storage, and (iii) an anode chamber for H+ production and protonation of gaseous NH3 to NH4+. The cathodic membrane and anode are connected to an electric power source to provide a stable cathodic potential and enable electrode reactions. This method will continuously treat nitrate-containing wastewater and achieve simultaneous electrochemical nitrate reduction from the wastewater and ammonia recovery as ammonium salts in the trap chamber.
Abstract:
The present disclosure relates to a method for producing hydrogen by electrolysing an aqueous hydrogen sulphide solution. The products of the electrolysis process are then subjected to a magnetic field to separate them into various product streams.
Abstract:
A water remediation and treatment device that includes a process channel having fluid inlet and a fluid outlet; at least one tube unit in fluid communication with the process channel, the tube unit defining an interior chamber defining an interior fluid flow path, at least one anode and at least one cathode contained in the interior chamber and positioned in the interior fluid flow path; and at least one device configured to remove material accumulated on the surface of the cathode and/or the electrode during water treatment.
Abstract:
In order to prevent an efficiency of lowering an oxidation-reduction potential of a liquid from being degraded when scales such as Ca contained in the liquid adsorb to an electrode and the liquid is subjected to electrolysis while the scales and the like adsorb to the electrode, provided is an alternating current electrolysis method for a liquid, including: arranging a pair of alternating electrodes each formed of a metal that lowers an oxidation-reduction potential and a first ground electrode formed of at least a metal in a liquid contained in a liquid tank; and controlling so that an alternating current is applied between the pair of alternating electrodes and an alternating current is intermittently applied from a ground potential to the first ground electrode.
Abstract:
Embodiments herein relate to methods for sludge reduction for pretreatment of nitrotoluene wastewater using electro-catalytic redox. The embodiments may include (a) adjusting a pH of the nitrotoluene wastewater to 1.5 to 2.0, standing for precipitation, draining sludge of the nitrotoluene wastewater at the bottom, obtaining supernatant of nitrotoluene wastewater, placing the supernatant through a cathode inlet into a cathode chamber of an electrochemical reactor; (b) performing electrochemical treatment, wherein reduction reaction of the supernatant of the nitrotoluene wastewater takes place at the cathode chamber, the nitrotoluene wastewater is placed into the anode chamber for oxidation reaction through the cathode outlet, the catholyte tank, and the anode inlet in sequence; (c) adjusting the nitrotoluene wastewater treated in step (b) via the anolyte tank, and then discharging the nitrotoluene wastewater into a biochemical system. The embodiments reduce toxicity of mixed acid nitration wastewater and therefore improve its biodegradability.
Abstract:
According to an aspect of the present invention, a hydrogen-containing water generating device that generates water containing hydrogen includes: a hydrogen-containing water generating electrode that includes a positive electrode being a tubular conductor and including a plurality of openings in a side portion, an insulator provided on an outer peripheral portion of the positive electrode, and a negative electrode being a tubular conductor provided on an outer peripheral portion of the insulator and including a plurality of openings in a side portion; and a light emitting body that is provided at a position of the hydrogen-containing water generating electrode.
Abstract:
According to an aspect, a hydrogen-containing water generating device includes: a positive electrode that is a tubular conductor and includes a plurality of openings in a side portion; an insulator; a negative electrode that is provided on an outer peripheral portion of the insulator, is a tubular conductor in contact with the insulator, and includes a plurality of openings in a side portion; a first support that is mounted to a first end portion side of the positive electrode and a first end portion side of the negative electrode; and a second support that is mounted to a second end portion side of the positive electrode and a second end portion side of the negative electrode. At least one of the first support and the second support includes an opening portion connected with a space surrounded by the side portion of the positive electrode.
Abstract:
Methods and systems for reducing a redox active contaminant in a waste stream in a waste treatment system involve performing a unit process of the waste treatment system by contacting redox active contaminant in the waste stream with oxyhydrogen-rich gas generated on-site by an oxyhydrogen gas generator that implements water dissociation technology. The oxyhydrogen gas generator involves applying a pulsed electrical signal to a series of closely spaced electrodes that are submerged in the waste stream to produce oxyhydrogen-rich gas from a water component of the waste stream. Operation of the oxyhydrogen gas generator in the waste stream may accomplish one or more unit processes for waste treatment, such as oxidation, stripping, floatation, disinfection, conditioning, stabilization, thickening, and dewatering, among others.