Installation for the recirculation of fresh water of the type that includes a pretreatment module for pretreating the water from an aquaculture tank, an oxidation module for the elimination of contaminants and a recirculation of the treated fresh water to the culture tank, after a post-treatment module that also passing through includes an electrochemical module for generating oxidants arranged in an auxiliary line, outside the main line for recirculating the treated fresh water, which is fed by a water recirculation line from the outlet of the post-treatment module, the electrochemical oxidant generation module being decoupled from the oxidation module and in fluid communication with it through an electrogenerated oxidant feed line.

The invention relates to a method and a system for purification of water in a water purification system. The water purification system comprises first and second mixing reactors, first and second flotation reactors and first and second filters all serially and fluidly connected in a flow direction of the water as well as an electrolyzer. During the process, electrochemical synthesis of the reagents takes place in the cathode and anode chambers of the electrolyzer, respectively. Moreover, the electrochemically synthesized catholyte and anolyte are dosed into the water kept in the first and second mixing reactors, respectively. Then the mixtures in the first and second mixing reactors are mixed. After that, the flow of the treated water leaving the mixing reactors is passed through the first and second flotation reactors and afterwards through the first and second filters downstream of the first and second mixing reactors.

The invention provides a method of treating waste comprising the steps of: providing an electrochemical cell comprising a cathode, and an anode; supplying a waste stream comprising an organic compound which is a liquid or dissolved in a solvent and contacting the anode and cathode with the waste stream; electrochemically oxidising the organic compound at the anode; supplying oxygen to the cathode; electrochemically reducing the oxygen at the cathode; wherein the cathode comprises a poison resistant oxygen reduction catalyst.

The invention provides a device to purify waste water by a two-step procedure containing an electroflotation unit and an electrical dis-infection unit integrated into the same overall construction. Characteristic to the construction is that the said two units have a common anode and two individual cathodes which can be in different potentials in respect to the common anode.

An electrochemical system and method are disclosed for On Site Generation (OSG) of oxidants, such as free available chlorine, mixed oxidants and persulfate. Operation at high current density, using at least a diamond anode, provides for higher current efficiency, extended lifetime operation, and improved cost efficiency. High current density operation, in either a single pass or recycle mode, provides for rapid generation of oxidants, with high current efficiency, which potentially allows for more compact systems. Beneficially, operation in reverse polarity for a short cleaning cycle manages scaling, provides for improved efficiency and electrode lifetime and allows for use of impure feedstocks without requiring water softeners. Systems have application for generation of chlorine or other oxidants, including mixed oxidants providing high disinfection rate per unit of oxidant, e.g. for water treatment to remove microorganisms or for degradation of organics in industrial waste water.

The invention relates to an effluent COD treatment procedure by anodic oxidation combining the use of two different types of anode with a suitable apportionment of current. The first type of anode comprises an anode based on diamond doped-synthetic diamond. The second type of anode comprises an anode with high oxygen overvoltage containing tin and antimony oxides.

An air/water advanced oxidation purification device includes a draft tube, a motor and at least one spiral partition plate. The spiral partition plate is fixed on an output shaft of the motor. The motor is supported in the draft tube and used for driving the spiral partition plate to rotate at uniform speed around the central axis of the draft tube and for driving air or water to enter into the draft tube. The spiral partition plate includes a plurality of miniature blades arranged along a radial direction of the spiral partition plate, each of the miniature blades includes a plurality of first and second protrusions continuously and staggered arranged along the radial direction and protruding towards two sides of the spiral partition plate, respectively. Air or water is purified through photo-catalytic advanced oxidation reaction or electro-catalytic oxidation-reduction reaction taken place on the surfaces of the spiral partition plate.

The present invention provides a set of ozone water manufacturing device which can greatly reduce an unpleasant smell of ozone gas when ozone water is used for sterilizing hands and feet, and can save power consumption of a pump which operates for preventing stagnation of a water stream in an electrolytic bath. The ozone water manufacturing device includes an electrolytic bath and a mixer which atomizes air bubbles of the ozone gas in the ozone water flowing out of the electrolytic bath. Each of the electrode assemblies in an electrode unit within the electrolytic bath is inclined at the predetermined same angle in a vertical direction. The mixer includes a mixing case bottom and a mixing case main body. A vortex flow generating plate generates a violent water stream from the water stream within the mixing case main body.

Variable-scale, modular, easily manufacturable, energy efficient, reliable, and computer operated aeroponic farming superstructure systems (AFSS) may be used to produce plants for human consumption with minimal water and environmental impact. An AFSS system may comprise modules including liquid distribution and plant growing. An AFSS may be configured to be constructed out of a plurality of containerized modules.

An oxygen evolution reaction catalyst is a ternary metal oxide that includes Mn and is represented by Mn.sub.uSb.sub.vO.sub.w in the rutile crystal phase and M.sub.xMn.sub.yO.sub.z where M is selected from the group consisting of Ca, Ni, Sr, Zn, Mg, Ni, Ba, Co and where u/(u+v) is greater than 33%.