There are provided processes for treating wastewater. The processes can comprise treating a mixture comprising the wastewater and an activated sludge, in a single reactor, with an electric current having a density of less than about 55 A/m.sup.2, by means of at least one anode and at least one cathode that define therebetween an electrical zone for treating the mixture; exposing the mixture to an intermittent ON/OFF electrical exposure mode to the electric current in which an OFF period of time is about 1 to about 10 times longer than an ON period of time; and maintaining an adequate oxidation-reduction potential in the single reactor. Such processes allow for substantial removal of carbon, nitrogen and phosphorus from the wastewater in the single reactor of various forms and for obtaining another mixture comprising a treated wastewater and solids.

Provided are a composition containing as active ingredients thereof Bacillus subtilis strain BN1001 (deposit number: FERM P-11132) and Bacillus subtilis var. natto, a wastewater treatment system provided with a biological treatment tank that biologically treats wastewater wherein the Bacillus subtilis strain BN1001 and Bacillus subtilis var. natto are contained in the biological treatment tank, a wastewater treating method that biologically treats wastewater comprising a step for adding the Bacillus subtilis strain BN1001 and Bacillus subtilis var. natto to the wastewater, a deodorization method comprising a step for contacting the Bacillus subtilis strain BN1001 and Bacillus subtilis var. natto with a malodorous source, a support having Bacillus subtilis and Bacillus subtilis var. natto supported thereon, a wastewater treatment system wherein the support is contained in a biological treatment tank, a wastewater treating method comprising a step for adding the support to wastewater, and a batch water treating method wherein the support is contained in a biological treatment tank.

A water purifier that includes: a filter unit that is configured to purify water; a cooling unit that is configured to cool water purified by the filter unit using cooling water; a water discharge unit that is configured to discharge water cooled by the cooling unit; a cold water flow path that couples the cooling unit to the water discharge unit and through which water cooled by the cooling unit passes; a cold water discharge valve that is coupled to a first side of the cooling unit and that is configured to control water flow inside the cold water flow path; and a check fitting unit that is coupled to a first side of the water discharge unit and that is configured to block pressure change inside the cold water flow path is disclosed.

Process for treating effluents containing nitrogen in ammonium form, using a sequential biological reactor (1), according to which: a volume of effluents to be treated in one complete cycle is introduced into the biological reactor in one or more successive fractions by volume, each fraction by volume being treated during a subcycle; each subcycle comprises a phase of feeding with a fraction by volume, and at least a first aerated step, during which total or partial oxidation of the ammonium to nitrites takes place by injection of air or of oxygen into the effluent, a settling out and emptying step taking place after the end of the complete cycle; the weight of N—NH.sub.4 to be treated is determined from the volume of effluents in the reactor at the end of the feeding phase, and from the difference between the initial N—NH.sub.4 concentration in the reactor and a concentration desired at the end of the aerated step, a maximum aeration time TM is dedicated to the aerated step, and an initial air flow rate Qairinit, for the beginning of the aerated step, is determined by taking into account the weight of N—NH.sub.4 to be treated and the maximum aeration time TM.

A method enhancing biological digestion of wastewater sludge is provided. The method uses chlorine dioxide to accelerate and improve the efficiency of aerobic or anaerobic digestion.

Method for treating a fluid containing ionized particles, by means of an apparatus provided with a hydraulic circuit (100) intercepted by an immiscible storage tank and by a cyclically regenerating filtering unit (3, 3A, 3B), connected in parallel to the tank. The following are provided for: a supply pipe connected to the hydraulic circuit (100) upstream of the immiscible storage tank for introducing fluid to be purified and an extraction pipe (9) connected to the hydraulic circuit (100) downstream of the filtering unit (3, 3A, 3B) for conveying purified fluid to the user. The method cyclically comprises a circulation step, in which the fluid circulates through the filtering unit (3, 3A, 3B) and the immiscible tank (2), accumulating in the latter an operating amount of fluid with increasing concentration of ionized particles, and a production step in which an operating amount of fluid to be purified is introduced into the hydraulic circuit (100) by the supply pipe such that an equivalent operating amount of fluid with increasing concentration of ionized particles previously accumulated in the tank is forced to exit from the tank itself and pass through the filtering unit (3, 3A, 3B) in order to be further purified and then drawn by the extraction pipe (9).

A system and method for purifying domestic sewage using 1 cycle per day, which reduces constructive complexities, energy demand and avoids the emission of hydrogen sulfide into the environment, the system comprising: a reactor comprising at least two air diffusers located at the bottom of the reactor; a sludge outlet duct and a clarified water outlet duct; a feed pipe connected at one end to a pump submerged inside a pumping chamber and at the other end to a wastewater inlet located at the bottom of the reactor; a programmable logic control; a valve arrangement consisting of four valves connected to a blower, each valve being connected to one of: the sludge outlet duct, the clarified water outlet duct, and the at least two diffusers.

A disinfection system includes an ozone water generator and a top seat movably connected to the ozone water generator. The top seat includes a generator control board and an on-off control device therein. The on-off control device includes a flow switch. The flow switch is connected to the generator control board through a signal wire. A top seat inlet of the top seat is in communication with a top seat outlet of the top seat through an inlet of the flow switch, an outlet of the flow switch, a generator inlet of the ozone water generator, a generator outlet of the ozone water generator and a pipe. The ozone water generator is connected to the generator control board through a connecting wire. The generator control board is connected to an external power source through a power wire. The disinfection system can sense changes in water flow and directly generate ozone water according to needs, thereby improving the convenience for use, ensuring the sensitivity of the flow switch and increasing the maximum water flow range.

A method for ecologic configuration of an oil production wastewater artificial wetland to realize up-to-standard operation in winter. When artificial wetland is utilized to treat oil production high-salt wastewater, ecologic configuration of subsurface and surface flow artificial wetland is modified to realize up-to-standard operation in winter. Subsurface flow artificial wetland is composed of soil matrix, water distribution pipe disposed on bottom of soil matrix, wrapped with water-permeable nonwoven cloth and configured to deliver wastewater, and reeds with root systems growing on an inner side of wall of water distribution pipe, stems growing on outer side of wall of water distribution pipe and length being greater than thickness of soil matrix; and surface flow artificial wetland is composed of soil matrix, reeds growing on matrix, water, winter aquatic salt-resistant cold-liking plants, block-stocked fishes, shrimps, crabs, mussels, Mytilus edulis, oysters or clams and artificial sand dam.

The present invention relates to a hydrogen water and sterile water-generating device that generates hydrogen water and sterile water by electrolysis. The hydrogen water and sterile water-generating device includes an electrolysis part that has at least two electrodes and electrolyzes water, a water introducing channel that introduces water into the electrolysis part, and a switch mechanism that switches the polarity of the electrodes between positive and negative, and hydrogen water and sterile water are generated in the same path by the switch mechanism switching the polarity of the electrodes between positive and negative during electrolysis.