公开(公告)号：US20180208491A1

公开(公告)日：2018-07-26

申请号：US15478456

申请日：2017-04-04

Applicant: Hitachi, Ltd.

Inventor： Yuya KIMURA ,  Shinichi YOSHIKAWA ,  Shoko MIYAMAE ,  Hajime IKUTA

IPC: C02F3/30 ,  C02F3/00

CPC classification number: C02F3/303 ,  C02F3/006 ,  C02F3/307 ,  C02F2101/16 ,  C02F2103/20 ,  C02F2103/343 ,  C02F2103/346

Abstract: Provided is a method for treating ammoniacal nitrogen in wastewater performed via biologically oxidizing ammoniacal nitrogen, and producing nitrite nitrogen and nitrate nitrogen at a desired rate. In the method, ammoniacal nitrogen is oxidized by bacterial sludges to produce at least either of nitrite nitrogen and nitrate nitrogen. Specifically, the method includes an inactivating treatment step of treating the bacterial sludges with an inactivating operation via sterilizing bacteria or causing bacteriostasis, and a nitrifying treatment step of oxidizing the ammoniacal nitrogen by the bacterial sludges thus treated in the inactivating operation. Production amounts of the nitrite nitrogen and the nitrate nitrogen are controlled by adjusting biomass of the bacterial sludges to be treated in the inactivating operation, and/or a time interval between the inactivating operations each repeatedly performed in combination with the nitrifying treatment step.

公开(公告)号：US20180297866A1

公开(公告)日：2018-10-18

申请号：US16015576

申请日：2018-06-22

Applicant: Hitachi, Ltd.

Inventor： Shinichi YOSHIKAWA ,  Katsuhiro MIBU ,  Yukiko ICHIGE ,  Katsuhiko SHIMIZU ,  Hideaki KUROKAWA

IPC: C02F1/44 ,  B01D61/58 ,  B01D61/02 ,  C02F1/00 ,  C02F3/12 ,  C02F103/08 ,  B01D61/14 ,  B01D61/06

Abstract: Provided are a water treatment system and a water treatment method capable of downsizing a facility and inexpensively producing freshwater. A water treatment system includes: a first reverse osmosis treatment device for separating wastewater into desalinated permeate water and concentrated wastewater; a mixing unit for mixing the separated concentrated wastewater and intake seawater; a second reverse osmosis treatment device for separating mixed water obtained by mixing the concentrated wastewater and the seawater into desalinated permeate water and concentrated mixed water; and a return pipe for returning a portion of the separated concentrated mixed water to the mixing unit. The water treatment method includes the following steps: mixing intake seawater with wastewater; separating the mixed water into permeate water and concentrated mixed water; re-mixing a portion of the concentrated mixed water with the mixed water; and producing freshwater by re-separating the re-mixed water into permeate water and concentrated mixed water.

公开(公告)号：US20180280888A1

公开(公告)日：2018-10-04

申请号：US15936643

申请日：2018-03-27

Applicant: HITACHI, LTD.

Inventor： Koji FUKUZAKI ,  Makoto ONISHI ,  Shinichi YOSHIKAWA ,  Shuji YAMADA ,  Kotaro KITAMURA ,  Yasutaka KONDO

IPC: B01D65/02 ,  B01D61/02 ,  B01D61/08 ,  B01D61/12 ,  B01D63/06 ,  C02F1/44 ,  B01D65/06

Abstract: A reverse osmosis treatment apparatus includes a membrane unit including an osmosis membrane module. The membrane unit includes a plurality of banks connected in series, each bank including an osmosis membrane module. At least one of the banks includes a treatment water pipe valve and a concentrated water pipe valve, and a bypass pipe capable of diverting the water to be treated, which is to be supplied to the bank, around the bank and draining the water to be treated and a chemical cleaning pipe capable of supplying the reverse osmosis membrane module disposed in the bank with chemical cleaning water are connected. A reverse osmosis treatment method is for cleaning intermittently a bank having the treatment water pipe valve and the concentrated water pipe valve while continuing the reverse osmosis treatment using the remaining bank.

公开(公告)号：US20170001883A1

公开(公告)日：2017-01-05

申请号：US15181472

申请日：2016-06-14

Applicant: Hitachi, Ltd.

Inventor： Shinichi YOSHIKAWA ,  Katsuhiro MIBU ,  Yukiko ICHIGE ,  Katsuhiko SHIMIZU ,  Hideaki KUROKAWA

IPC: C02F1/44 ,  B01D61/08 ,  B01D61/02

CPC classification number: C02F1/441 ,  B01D61/022 ,  B01D61/06 ,  B01D61/14 ,  B01D61/58 ,  B01D2311/04 ,  B01D2311/06 ,  B01D2311/08 ,  B01D2311/14 ,  B01D2311/25 ,  B01D2317/022 ,  C02F1/001 ,  C02F1/004 ,  C02F1/283 ,  C02F1/32 ,  C02F1/42 ,  C02F1/444 ,  C02F1/52 ,  C02F1/78 ,  C02F3/1273 ,  C02F2103/08 ,  C02F2209/001 ,  C02F2209/05 ,  C02F2209/40 ,  C02F2301/046 ,  C02F2301/08 ,  C02F2303/10 ,  C02F2303/16 ,  Y02A20/131 ,  Y02W10/15 ,  Y02W10/30

Abstract: Provided are a water treatment system and a water treatment method capable of downsizing a facility and inexpensively producing freshwater. A water treatment system includes: a first reverse osmosis treatment device for separating wastewater into desalinated permeate water and concentrated wastewater; a mixing unit for mixing the separated concentrated wastewater and intake seawater; a second reverse osmosis treatment device for separating mixed water obtained by mixing the concentrated wastewater and the seawater into desalinated permeate water and concentrated mixed water; and a return pipe for returning a portion of the separated concentrated mixed water to the mixing unit. The water treatment method includes the following steps: mixing intake seawater with wastewater; separating the mixed water into permeate water and concentrated mixed water; re-mixing a portion of the concentrated mixed water with the mixed water; and producing freshwater by re-separating the re-mixed water into permeate water and concentrated mixed water.

Abstract translation: 提供能够使设施小型化且廉价生产淡水的水处理系统和水处理方法。 水处理系统包括：将废水分离为脱盐渗透水和浓缩废水的第一反渗透处理装置; 用于混合分离的浓缩废水和进水海水的混合单元; 第二反渗透处理装置，用于将通过将浓缩废水和海水混合成脱盐的渗透水和浓缩混合水得到的混合水; 以及用于将分离的浓缩混合水的一部分返回到混合单元的返回管。 水处理方法包括以下步骤：将进水中的海水与废水混合; 将混合水分离成渗透水和浓缩混合水; 将一部分浓缩的混合水与混合水重新混合; 并通过将再混合水重新分离成渗透水和浓缩混合水来生产淡水。

公开(公告)号：US20160346735A1

公开(公告)日：2016-12-01

申请号：US15164990

申请日：2016-05-26

Applicant: Hitachi, Ltd.

Inventor： Kotaro KITAMURA ,  Shinichi YOSHIKAWA ,  Masayuki MATSUURA ,  Takanori OSHIKIRI ,  Yusuke OKAWA

IPC: B01D61/08 ,  B01D61/10 ,  C02F1/44 ,  B01D61/02

CPC classification number: B01D61/08 ,  B01D61/025 ,  B01D61/06 ,  B01D61/10 ,  B01D61/12 ,  B01D2313/243 ,  B01D2313/246 ,  B01D2317/04 ,  B01D2317/06 ,  C02F1/441 ,  C02F2103/08 ,  C02F2201/007 ,  C02F2303/10 ,  Y02A20/131 ,  Y02W10/30

Abstract: Provided is a seawater desalination system including reverse osmosis membrane modules each including: a reverse osmosis membrane; and a pressure vessel installing the reverse osmosis membrane, and configured to obtain permeated water and concentrated water using the reverse osmosis membranes housed in the reverse osmosis membrane modules by supplying seawater to the reverse osmosis membrane modules. The seawater desalination system includes a module group including the reverse osmosis membrane modules connected together in parallel. The seawater is supplied to each of the reverse osmosis membrane modules by being supplied to the module group through first and second seawater supply routes. The first and second seawater supply routes are each provided with a liquid transport pump configured to supply the seawater flowing through the seawater supply route to the module group.

Abstract translation: 提供了一种包括反渗透膜组件的海水淡化系统，每个包括：反渗透膜; 以及安装反渗透膜的压力容器，并且通过向反渗透膜组件供给海水，使用容纳在反渗透膜组件中的反渗透膜来获得渗透水和浓缩水。 海水淡化系统包括并联连接在一起的反渗透膜模块的模块组。 通过第一和第二海水供应路线向每个反渗透膜组件供应海水。 第一和第二海水供应路线分别设置有液体输送泵，其构造成将流过海水供应路线的海水供应到模块组。

公开(公告)号：US20210147270A1

公开(公告)日：2021-05-20

申请号：US17046347

申请日：2019-03-05

Applicant: HITACHI, LTD.

Inventor： Makiko UDAGAWA ,  Shoko MIYAMAE ,  Yuuya KIMURA ,  Shinichi YOSHIKAWA

IPC: C02F3/34 ,  C02F3/10 ,  C02F11/18 ,  C02F1/66

Abstract: The present invention provides a nitrogen treatment method which can suppress the production of nitrate nitrogen to stabilize the concentration of nitrite nitrogen in a nitritation treatment in which ammoniacal nitrogen is biologically oxidized to produce the nitrite nitrogen. A nitrogen treatment method includes a nitrification treatment step of producing nitrite nitrogen by oxidizing ammoniacal nitrogen contained in water to be treated, using microbial sludge, wherein: a volume load of the ammoniacal nitrogen in the nitrification treatment step is set to a high load of 0.3 kg-N/m3·day or more and 5 kg-N/m3·day or less; and in the nitrification treatment step, at least one of a treatment of adjusting a pH of the water to be treated to pH 8 or more and pH 10 or less and a treatment of applying an inactivating operation for sterilizing microorganisms or causing bacteriostasis to the microbial sludge is performed.

公开(公告)号：US20180179092A1

公开(公告)日：2018-06-28

申请号：US15478842

申请日：2017-04-04

Applicant: Hitachi, Ltd.

Inventor： Shinichi YOSHIKAWA ,  Yuya KIMURA ,  Shoko MIYAMAE

IPC: C02F3/30

CPC classification number: C02F3/307 ,  C02F2101/16 ,  C02F2209/02 ,  C02F2301/10 ,  C02F2303/10 ,  Y02E50/343 ,  Y02W10/30

Abstract: Provided is a wastewater treatment apparatus and a wastewater treatment method, in which denitrification process by anaerobic ammonium oxidation method can be stably performed at low cost. The wastewater treatment apparatus includes an ammonium oxidation tank and a heating tank in which the microbial sludge withdrawn from the ammonium oxidation tank is subjected to heat treatment. A wastewater treatment method is to heat the microbial sludge withdrawn from the ammonium oxidation tank by using heat supplied from a digestion tank in which waste sludge is digested by anaerobic microorganisms or from a heat source for heating the waste sludge to be digested in the digestion tank, and to return the microbial sludge, in which activity of nitrite oxidizing bacteria is reduced by the heat treatment, to the ammonium oxidation tank, so that the ammonium nitrogen contained in the wastewater is oxidized to nitrite nitrogen.