Patent application number | Description | Published |
20130001163 | METHOD FOR PRODUCING FRESH WATER - A method is provided for producing fresh water, the method including feeding raw water to a semipermeable membrane to obtain fresh water, in which water having a solute concentration different from that of the raw water is fed and mixed with the raw water according to changes of a flow rate of fresh water of the semipermeable membrane unit and/or operating pressure of the semipermeable membrane unit. | 01-03-2013 |
20130140233 | FRESH WATER PRODUCING APPARATUS AND METHOD FOR OPERATING SAME - A fresh water producing apparatus for producing fresh water from raw water containing solutes is disclosed. The fresh water producing apparatus comprises a first semipermeable membrane unit and a second semipermeable membrane unit. A first raw water supply line for supplying the raw water is connected to the first semipermeable membrane unit. A second raw water supply line for supplying the raw water is connected to the second semipermeable membrane unit. The first semipermeable membrane unit and the second semipermeable membrane unit are connected by a concentrated water line for supplying concentrated water of the first semipermeable membrane unit to the second semipermeable membrane unit. | 06-06-2013 |
20130220924 | FRESH WATER GENERATION METHOD AND FRESH WATER GENERATION DEVICE - In order to prevent oxidation degradation of a semipermeable membrane and biofouling growth and avoid an increase in cost due to chemicals and the like, the present invention provides a fresh water production method including membrane-filtering raw water with a microfiltration/ultrafiltration membrane module, followed by performing membrane filtration with a semipermeable membrane unit, in which the membrane filtration in the microfiltration/ultrafiltration membrane module is temporarily interrupted, chlorine agent-containing water is fed from a secondary side of the microfiltration/ultrafiltration membrane module to perform back-pressure washing of the microfiltration/ultrafiltration membrane module, thereafter, an ammoniacal compound and/or an amino group-containing compound are added to a primary side of the microfiltration/ultrafiltration membrane module, and the membrane filtration in the microfiltration/ultrafiltration membrane module is resumed. | 08-29-2013 |
20140048483 | METHOD FOR CLEANING MEMBRANE MODULE - In a method for cleaning a membrane module including at least one of a microfiltration membrane and an ultrafiltration membrane through which raw water is membrane-filtered to obtain membrane filtrate, a chemical diffusion step is provided in which chemical-containing water is fed to a feed side of the membrane module and diffused from the feed side of the membrane module to a filtrated side of the membrane module is performed, and subsequently a backwashing step is provided in which the membrane module is backwashed by allowing the membrane filtrate to flow from the filtrated side to the feed side of the membrane module is performed, in which, in the chemical diffusion step, an execution time of the chemical diffusion step is controlled based on a concentration of the chemical diffused to the filtrated side of the membrane module. | 02-20-2014 |
20140131281 | MEMBRANE FILTRATION METHOD AND MEMBRANE FILTRATION DEVICE - A membrane filtration method and membrane filtration device including a pre-treatment membrane module that filters raw water with a filtration membrane and obtains pre-treated water; a reverse osmosis membrane module that filters the pre-treated water obtained from the pre-treatment membrane module with a reverse osmosis membrane and obtains permeate and retentate; a communicating tube channel that directly joins the pre-treated water outlet of the pre-treatment membrane module and the pre-treated water inlet of the reverse osmosis membrane module; and a branch tube channel that branches from the communicating tube channel and diverts a portion of the pre-treated water flowing in the communicating tube channel from the communicating tube channel. The filtration membrane of the pre-treatment membrane module is backwashed using the pre-treated water that has been diverted by the branch tube channel. | 05-15-2014 |
20140284929 | CONCENTRATION DIFFERENCE POWER GENERATION DEVICE AND METHOD FOR OPERATING SAME - A concentration-difference power generation apparatus in which high-concentration water and low-concentration water which differ in their concentrations are brought into contact with each other through a semi-permeable membrane unit including a semi-permeable membrane, and a resultant increase in an amount of the high-concentration water due to permeation of water from a low-concentration side to a high-concentration side caused by a forward osmotic pressure is utilized to drive an electric generator to generate electricity, in which the semi-permeable membrane unit is divided into a plurality of subunits and the concentration-difference power generation apparatus includes a pressure change mechanism disposed on a high-concentration-side channel extending from the preceding-stage subunit to the next-stage subunit or a low-concentration-side channel. | 09-25-2014 |
20150096930 | SEPARATION MEMBRANE MODULE AND REPLACEMENT METHOD FOR SEPARATION MEMBRANE ELEMENT - The present invention relates to a separation membrane module in which a plurality of spiral-type separation membrane elements for use in separating and removing ingredients present in a fluid to be treated are loaded. The present invention provides a separation membrane module in which a plurality of spiral-type separation membrane elements are loaded in a cylindrical pressure-resistant vessel and which allows easy loading and removal of the separation membrane elements while maintaining sealing property even when high-hardness foreign particles are present on sealing surfaces and fully achieving its performance, thereby ensuring reductions in maintenance time and labor, and provides a replacement method for such separation membrane elements. | 04-09-2015 |
20150144559 | MEMBRANE SEPARATION DEVICE AND OPERATION METHOD FOR MEMBRANE SEPARATION DEVICE - A membrane separation device includes a separation membrane unit A that has a separation membrane unit component | 05-28-2015 |
20150144560 | SEPARATION MEMBRANE UNIT AND METHOD FOR USING THE SAME TO PRODUCE FRESH WATER - There is provided a separation membrane unit wherein a plurality of separation membrane subunits ( | 05-28-2015 |