Abstract: There is provided a method for water treatment, capable of greatly improving the effect of removing microbes contained in water for eating and drinking, or discharged water.

Abstract: There are provided an electrode for electrolysis which takes into consideration safety to human bodies and environmental pollution upon disposal of the electrode, produces ozone with high efficiency and has excellent durability, a production process of the electrode, and an active oxygen producing device using the electrode. In an electrode 5 for electrolysis which has an electrode catalyst at least on the surface and produces ozone or active oxygen in for-treatment water by electrolysis, the electrode catalyst contains a dielectric which constitutes more than 70% of the surface area of the electrode catalyst.

Abstract: The present invention is directed to a new water treatment device comprising an electrolytic tank to put water in, an electrode provided in the electrolytic tank, a water treating path for pouring water in a pool and returning to the pool the water in the electrolytic tank, a residual chlorine sensor for measuring the residual chlorine concentration of water, and control means for controlling the energization of the electrode on the basis of the measured value by the residual chlorine sensor, and capable of simply and efficiently sterilizing water stored in pools of various sizes from a swimming pool to a home bathtub.

Abstract: The present invention is directed to a new water treatment device comprising an electrolytic tank to put water in, an electrode provided in the electrolytic tank, a water treating path for pouring, from a pool storing water, the water into the electrolytic tank and returning to the pool the water in the electrolytic tank, a residual chlorine sensor for measuring the residual chlorine concentration of the water, and a circulating pump provided on the downstream side of the electrolytic tank on the water treating path in order to circulate the water, and capable of simply and efficiently sterilizing water stored in pools of various sizes from a swimming pool to a home bathtub.

Abstract: There are provided a water treating method and water treating apparatus which can significantly improve an effect of eliminating microorganisms contained in water intended for drinking and cooking or waster water and a hydroponics system using the apparatus.

Abstract: There are provided an ozone producing method and apparatus capable of significantly increasing an amount of ozone produced in for-treatment water. In the ozone producing method of the present invention, a noble metal is used as a material constituting the anode, and the for-treatment water contains halogen ions or a compound containing halogen ions.

Abstract: There is provided a water treating method which can not only improve an effect of eliminating microorganisms in water intended for cooking and drinking or waste water but also prevent a reduction in trace amounts of nutritional elements. In the method, at least a pair of carbon fibers capable of collecting at least microorganisms are immersed in for-treatment water, potentials of opposite polarities are applied to the carbon fibers, and the polarities of the potentials are switched at a predetermined time interval so as to adsorb the microorganisms on the carbon fibers. After the microorganisms are adsorbed, a positive potential is applied to one of the carbon fibers, and a negative potential is applied to the other so as to cause electrolysis. Then, an alternating voltage is applied to the carbon fibers so as to heat the for-treatment water and the carbon fibers.

Abstract: In a circulation system of treatment-object water (waste water), a water treating apparatus and a pH adjuster are provided. A carbon fiber that can collect at least microorganisms is disposed in the water treating apparatus. The carbon fiber is immersed in the treatment-object water, and potential is applied to the carbon fiber. Further, pH of the treatment-object water is adjusted by the pH adjuster in a direction in which adsorption of microorganisms in the treatment-object water to the carbon fiber is facilitated. As a result, the microorganisms are strongly attracted and adsorbed to the carbon fiber.

Abstract: There are provided a sterilizing method which can sterilize bacteria such as Legionella, chlorine resistant bacteria, spores and protozoa, which are bred in bathrooms and the like in particular, using bactericidal water having a high sterilizing effect, and which can avoid an accident, while using a chlorine agent, caused by generation of poisonous chlorine gas due to mixing with an acid agent, and further an electrolyzed water producing apparatus. The gist is to produce electrolyzed water containing hypohalogenous acid and active oxygen such as ozone by electrolyzing water to be electrolyzed, such as tap water, thereby to perform sterilization using the produced electrolyzed water.

Abstract: There is provided a method for water treatment, capable of greatly improving the effect of removing microbes contained in water for eating and drinking, or discharged water.

Abstract: The present invention is directed to a new water treatment device comprising an electrolytic tank to put water in, an electrode provided in the electrolytic tank, a water treating path for pouring, from a pool storing water, the water into the electrolytic tank and returning to the pool the water in the electrolytic tank, a residual chlorine sensor for measuring the residual chlorine concentration of the water, and a circulating pump provided on the downstream side of the electrolytic tank on the water treating path in order to circulate the water, and capable of simply and efficiently sterilizing water stored in pools of various sizes from a swimming pool to a home bathtub.

Abstract: The present invention is directed to a new water treatment device comprising an electrolytic tank to put water in, an electrode provided in the electrolytic tank, a water treating path for pouring water in a pool and returning to the pool the water in the electrolytic tank, a residual chlorine sensor for measuring the residual chlorine concentration of water, and control means for controlling the energization of the electrode on the basis of the measured value by the residual chlorine sensor, and capable of simply and efficiently sterilizing water stored in pools of various sizes from a swimming pool to a home bathtub.

Abstract: A method of manufacturing a nickelous positive-electrode active material for an alkaline battery has a formation process in which nickel hydroxide and cobalt hydroxide are formed by adding an alkali metal hydroxide to a reaction system containing nickel ions and cobalt (II) ions. The method comprises at least one step of removing any oxidant which oxidizes the cobalt (II) ions into cobalt (III) ions, during or before the formation process. An expedient for the removal of the oxidant is, for example, to reduce and remove the oxidant by adding a reductant, such as L-ascorbic acid, to the reaction system. The reductant should preferably have an oxidation potential which is lower than the reduction potential of oxygen. Besides, the method should preferably comprise the step of removing the cobalt (III) ions, during or before the formation process.