Abstract: A pure water production system includes a reverse osmosis membrane device; an electric deionized water production device that is disposed downstream of the reverse osmosis membrane device; and a control device that controls a processing condition of the reverse osmosis membrane device. The control device controls a processing condition of the reverse osmosis membrane device such that a removal rate of a specific substance of the electric deionized water production device is equal to or lower than a threshold value, and concentration of the specific substance in the treated water of the electric deionized water production device is equal to or lower than a prescribed value and specific resistance of the treated water of the electric deionized water production device is equal to or higher than a prescribed value.

Abstract: A water treatment system that can effectively remove persistent organic materials is provided. Water treatment system has: means for adding halogen oxoacid that adds halogen oxoacid to water to be treated that contains organic materials; and ion exchanger loaded apparatus that is positioned downstream of means for adding halogen oxoacid, wherein at least anion exchangers are loaded in ion exchanger loaded apparatus. The water to be treated to which the halogen oxoacid has been added is supplied to ion exchanger loaded apparatus.

Abstract: Water treatment apparatuses for removing impurities from supplied water and an information processing device are provided. The information processing device, based on the removal rates for removing impurities in the water treatment apparatuses, calculates a predicted value of the concentration of impurities contained in the water supplied from the water to be treatment apparatuses when water currently being supplied is treated by the water treatment apparatuses.

Abstract: A management system includes: a database that stores a first cleanliness indicating the liquid quality of the cleaning solution after the cleaning unit that cleans a container to which unique identification information is assigned cleans the container, in association with the identification information assigned to the container, and a management device that searches the database for the identification information associated with the first cleanliness that corresponds with a second cleanliness requested from the outside, and outputs the identification information that was retrieved.

Abstract: Provided is a water recovery system and a water recovery method whereby, in water recovery using a reverse osmosis membrane from water to be treated containing organic matter, it is possible to also suppress slime contamination on the secondary side of the reverse osmosis membrane. A water recovery system includes: a reverse osmosis membrane treatment device which separates water to be treated containing organic matter into permeated water and concentrated water with a reverse osmosis membrane; iodine-based oxidizing agent adding piping which adds an iodine-based oxidizing agent to the water to be treated; and permeated water piping as a supply means for supplying the permeated water as water to be treated in a water utilization system.

Abstract: A water treatment method that uses a reaction tank and involves repeatedly performing an operation cycle including: an inflow step for causing an inflow of waste water; a biological treatment step for subjecting the waste water to biological treatment using biological sludge; a sedimentation step for causing the biological sludge to settle; and a drainage step for draining biologically-treated water that has undergone the aforementioned biological treatment. The reaction tank is provided with an inflow port that is disposed at a position lower than an interface position of a biological sludge bed formed at the bottom of the reaction tank in the sedimentation step, and an inflow pipe that extends upward in the vertical direction from the inflow port. In the inflow step, the waste water is caused to gravitationally flow down in the inflow pipe so as to be fed into the biological sludge bed from the inflow port.

Abstract: An apparatus for producing ultrapure water: first ultrafiltration membrane that is connected to point of use and that supplies ultrapure water to point of use; first concentrated water return line that returns concentrated water of first ultrafiltration membrane to an upstream side of first ultrafiltration membrane; pressure gauge that measures pressure at an outlet of first ultrafiltration membrane; and means for adjusting flow rate of the concentrated water (first valve). Means for adjusting the flow rate of the concentrated water can be operated such that when the flow rate of the concentrated water is changed, a change in the pressure at the outlet of first ultrafiltration membrane that is measured by pressure gauge is kept within a predetermined range.

Abstract: A water treatment apparatus that can enhance the efficiency of removing hydrogen peroxide is provided. A water treatment apparatus (pure water production apparatus) has anion removing means that removes anions from water to be treated that contains hydrogen peroxide and the anions; and platinum group catalyst carriers (catalyst tower) that are positioned downstream of anion removing means.

Abstract: A hydrogen peroxide removing apparatus for removing hydrogen peroxide contained in water to be processed includes: anode and cathode; and hydrogen peroxide removal chamber provided between anode and cathode and at least partially filled with a metal catalyst with hydrogen peroxide decomposition ability, wherein a DC voltage is applied between anode and cathode.

Abstract: A water quality management method for performing at least one of a quantitative analysis and a qualitative analysis of fine particles contained in water to be analyzed that includes connecting a filtration device provided with a fine particle capturing membrane for capturing fine particles to a flow pipe through which the water to be analyzed flows, allowing the water to be analyzed to flow from the flow pipe and through the fine particle capturing membrane attached to the filtration device for a predetermined period of time to capture fine particles contained in the water to be analyzed to form a fine particle capturing membrane sample, and performing at least one of a quantitative analysis and a qualitative analysis of the fine particle capturing membrane sample of a target water flow period at an arbitrary timing.

Abstract: A water treatment apparatus that can remove persistent organic materials more efficiently is provided. Water treatment apparatus has hypohalogenous acid addition means that adds hypohalogenous acid to water to be treated that contains organic materials; and ultraviolet ray radiating apparatus that is positioned downstream of hypohalogenous acid addition means and that radiates ultraviolet rays to the water to be treated to which the hypohalogenous acid has been added.

Abstract: Provided are an apparatus for removing boron and a method for removing boron for reducing the boron concentration in water to be treated, and an apparatus and a method for producing pure water wherein the boron concentration is reduced. An apparatus for removing boron includes: a first electrodeionization device to which water to be treated is supplied; an ultraviolet oxidation device to which the water treated by the first electrodeionization device is supplied; an oxide removal device to which the water treated by the ultraviolet oxidation device is supplied; and a second electrodeionization device to which the water treated by the oxide removal device is supplied. A method for removing boron using the apparatus is provided. The oxide removal device is equipped with a platinum group metal catalyst, and the water that has been treated by the oxide removal device has a hydrogen peroxide concentration of less than 1 ppb.

Abstract: The present application provides a water treatment method, a water treatment device, and a slime inhibitor for membranes that are capable of, in water treatment using a separation membrane and a reverse osmosis membrane in the subsequent stage, inhibiting the generation of a slime both in the separation membrane and in the reverse osmosis membrane by a simple method. The water treatment method includes adding an iodine-based oxidizer to water to be treated, subjecting the water to be treated obtained during the adding of the iodine-based oxidizer to filtration with the separation membrane, and causing filtrated water obtained during the filtration to be separated with the reverse osmosis membrane into permeated water and concentrated water.

Abstract: Provided is a method for producing a one-liquid stabilized hypobromous acid composition which contains substantially no bromate ions, has excellent sterilization performance, exhibits almost no corrosiveness relative to metals, and displays excellent storage stability. This method for producing the stabilized hypobromous acid composition includes a step in which a reaction is induced by adding, under an inert gas atmosphere, bromine to a mixed solution including water, an alkali hydroxide, and sulfamic acid, wherein the proportion of bromine added is not more than 25 wt % relative to the total weight of the composition.

Abstract: A method of removing boron from water to be treated includes subjecting the water to be treated to reverse osmosis membrane treatment, subjecting at least part of permeated water after the reverse osmosis membrane treatment to cation-removing treatment, and measuring a concentration of boron in the resulting permeated water after the cation-removing treatment, in which a measured value for the concentration of boron is used to regulate at least one of: (a) the recovery rate of water to be treated in the above reverse osmosis membrane treatment, (b) the temperature of the water to be treated, (c) the pH of the water to be treated, (d) the supply pressure of the water to be treated, which pressure is applied to the reverse osmosis membrane during the reverse osmosis membrane treatment, and (e) when the reverse osmosis membrane used for the reverse osmosis membrane treatment should be changed.

Abstract: In an insoluble material-generating apparatus, an iron salt and/or an aluminum salt, and a cationic polymer flocculant, are added to waste water containing dissolved substances to generate insoluble material. To the insoluble material-containing waste water, an anionic polymer flocculant is added, after which the waste water containing the anionic polymer flocculant and the insoluble material is stirred in a granulating flocculation precipitation tank, the insoluble material is granulated, and solid-liquid separation of the generated granulated material is performed to obtain treated water. The amount of the iron salt or the aluminum salt added is an iron or aluminum concentration of at least 0.4 mmol/L, and the cationic polymer flocculant and the anionic polymer flocculant are added so that the product of the cationic polymer flocculant concentration and the cationic group percentage is equal to or less than the product of the anionic polymer flocculant concentration and the anionic group percentage.

Abstract: The present application includes a tank into which water to be treated flows, an imaging device for capturing an image of water into which coagulant has been added and that is stored in the tank, and a control device for performing grayscale processing of the image captured by the imaging device, performing differential processing of the image subjected to the grayscale processing, and determining the state of the aggregate in the water based on the feature value calculated from the result of performing differential processing.

Abstract: An object is to provide a degrading bacteria-immobilized carrier on which a 1,4-dioxane-degrading bacterium is supported, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier. As a means for achieving the object, a degrading bacteria-immobilized carrier comprising a porous carrier and a 1,4-dioxane-degrading bacterium supported on the porous carrier, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier, are provided.

Abstract: A method for purifying a nonaqueous liquid substance includes: filling a cartridge container with a macroporous or porous type ion exchange resin in a water-wet state to obtain an ion exchange resin-filled cartridge filled with the macroporous or porous type ion exchange resin before water content reduction; reducing a water content of the macroporous or porous type ion exchange resin in the cartridge container until a water content (A) of the macroporous or porous type ion exchange resin after water content reduction becomes 90 to 97% of a water content (B) of the macroporous or porous type ion exchange resin in a saturated equilibrium state; an initial blowing step of allowing the nonaqueous liquid substance before being purified to pass inside the cartridge container filled with the macroporous or porous type ion exchange resin after water content reduction and discharging an initial blow effluent from inside the cartridge container; and purification.

Abstract: Provided are a water treatment method and a water treatment device wherein in a biological treatment of ammonium nitrogen-containing water to be treated, the water to be treated can be treated stably at a high treatment speed even when the nitrogen concentration of the water to be treated is high. This water treatment device biologically treats ammonium nitrogen-containing water to be treated. The water treatment device (water treatment method) is provided with: a nitrification device (nitrification step) for oxidizing ammonium nitrogen to nitrite or nitrate nitrogen using nitrifying bacteria including autotrophic ammonia-oxidizing bacteria and nitrite-oxidizing bacteria contained in microbial activated sludge; and a nitrification rate control means which maintains a molybdenum compound in the nitrification device in such a manner as to control the molybdenum concentration of the water to be treated to 0.025 mg Mo/gN or more, and controls the nitrification rate for the sludge to 0.11 [kgN/(kgVSS·day)].