WO2013105421A1 - 逆浸透処理方法 - Google Patents
逆浸透処理方法 Download PDFInfo
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- WO2013105421A1 WO2013105421A1 PCT/JP2012/083288 JP2012083288W WO2013105421A1 WO 2013105421 A1 WO2013105421 A1 WO 2013105421A1 JP 2012083288 W JP2012083288 W JP 2012083288W WO 2013105421 A1 WO2013105421 A1 WO 2013105421A1
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- WIPO (PCT)
- Prior art keywords
- reverse osmosis
- water
- iron
- osmosis treatment
- treatment method
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/04—Feed pretreatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
- C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
Definitions
- the present invention relates to a reverse osmosis treatment method, and more particularly, to a method of reverse osmosis treatment after adding an iron-based inorganic flocculant to water to be treated, followed by solid-liquid separation.
- Patent Document 1 discloses a method of performing membrane separation treatment with a reverse osmosis membrane device (hereinafter sometimes referred to as RO device) after adding ferric chloride to water to be treated, separating by pressure floating and sand filtering. It is well-known as described in 2 etc.
- RO device reverse osmosis membrane device
- a scale dispersant is also added to the RO water supply (Patent Documents 3 and 4).
- Patent Document 5 paragraph 0003 describes that the flocculant made of iron chloride contains Mn (manganese), and the 38% concentration of ferric chloride solution contains 400 to 1000 mg / L of manganese. Has been.
- An object of the present invention is to provide a reverse osmosis treatment method capable of preventing deterioration of an RO membrane due to heavy metals in an iron-based inorganic flocculant.
- the reverse osmosis treatment method of the present invention is a reverse osmosis treatment method in which an iron-based inorganic flocculant is added to water to be treated, solid-liquid separated, and then treated with a reverse osmosis device. A scale inhibitor and a scale dispersant are added.
- the present invention is suitable for application when the total content of Mn, Zn and Ni in the iron-based inorganic flocculant is 0.05% by weight or more.
- an iron-based inorganic flocculant is added to the water to be treated, and the separated water that has been subjected to solid-liquid separation is used as RO water supply.
- a chelate scale inhibitor is added to the RO water supply.
- Water to be treated examples include industrial water, river water, lake water, well water, biologically treated water of organic waste water, waste water from various manufacturing processes and cleaning processes, and the like.
- iron-based inorganic flocculant examples include ferric chloride and polyiron sulfate, and particularly ferric chloride having a high heavy metal content.
- Ni and Zn in the iron-based inorganic flocculant is 0.05 wt% or more and 5 wt% or less, for example 0.1 wt% or more and 2 wt% or less It is effective.
- the amount of iron-based inorganic flocculant added to the water to be treated is preferably determined experimentally by jar test or the like.
- the amount of the iron-based inorganic flocculant added to the water to be treated is usually about 10 to 400 mg / L, although it varies depending on the quality of the water to be treated.
- an iron-based inorganic flocculant When an iron-based inorganic flocculant is added to the water to be treated, it is preferable to add a pH adjuster as necessary to adjust the pH to 4 to 8, particularly about 5 to 8, and perform the flocculant treatment.
- the pH adjuster include acids such as hydrochloric acid and sulfuric acid, and alkalis such as sodium hydroxide, but are not limited thereto.
- a polymer flocculant such as an anionic polymer flocculant may be added.
- Solid-liquid separation As solid-liquid separation after the flocculation treatment, it is desirable to use both floating separation or sedimentation separation and filtration for passing water through the filter medium layer. Sand, anthracite, or the like can be used as the filter medium.
- chelate scale inhibitor ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), or the like is preferably used. These chelate-based scale inhibitors may be used alone or in combination of two or more.
- the amount of addition of a chelate scale inhibitor such as EDTA or NTA is preferably 20 times or more, particularly 30 to 40 times the total equivalent weight of heavy metals of Mn, Zn and Ni in the RO water supply.
- a chelate scale inhibitor such as EDTA or NTA
- the chelate scale inhibitor forms a chelate compound with the heavy metal in the RO water supply, solubilizes the heavy metal, so that the heavy metal flows out together with the concentrated water from the RO device, and the heavy metal is RO Adhering to the membrane surface is prevented, and deterioration of the RO membrane due to the catalytic action of heavy metals is prevented.
- Scale dispersants include (meth) acrylic acid polymers and salts thereof, low molecular weight polymers such as maleic acid polymers and salts thereof, ethylenediaminetetramethylenephosphonic acid and salts thereof, hydroxyethylidene diphosphonic acid and salts thereof, nitrilotrimethylene Use phosphonic acid and phosphonate such as phosphonic acid and its salt, phosphonobutane tricarboxylic acid and its salt, hexametaphosphoric acid and its salt, inorganic polyphosphoric acid and inorganic polymeric phosphate such as tripolyphosphoric acid and its salt, etc. be able to. These scale dispersants may be used alone or in combination of two or more. The amount of the scale dispersant added is preferably about 1 to 100 mg / L with respect to the solid-liquid separated water that is the water supplied to the RO apparatus.
- Example 1 A simulated waste water (Ca: 100 mg / L, F: 13 mg / L, pH 3) of HF waste water is prepared and introduced into the reaction tank 1 as shown in FIG. 1, and sodium hydroxide is added to adjust the pH to 6-7. While adjusting, ferric chloride was added so that the density
- the effluent water from the reaction tank 1 is introduced into the coagulation tank 2 and reacted, and then subjected to pressure levitation treatment in the pressure levitation tank 3, and the treated water is treated with the two-layer filter 4 (filter medium: sand, anthracite). And filtered. 10 mg / L of Wellclin A801 (manufactured by Kurita Kogyo) as a chelate scale inhibitor is added to the filtered water of the filter 4, and 10 mg / L of Clifloat N900 (manufactured by Kurita Kogyo) is added as a scale dispersant, and then the RO device.
- RO membrane treatment was performed at 5.
- the RO membrane was Nitto Denko ES-20, and the recovery rate was 85%.
- FIG. 2 shows changes over time in the desalting rate and the differential pressure of the RO device 5.
- FIG. 2 shows changes over time in the desalting rate and the differential pressure of the RO device 5.
- the RO membrane is prevented from deteriorating and the desalination rate is maintained high over a long period of time.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
Description
被処理水としては、工業用水、河川水、湖沼水、井水などの他、有機性排水の生物処理水、各種製造工程や洗浄工程からの排水などが例示される。
鉄系無機凝集剤としては、塩化第二鉄、ポリ硫酸鉄などが挙げられるが、特に重金属含有率が高い塩化第二鉄が挙げられる。この鉄系無機凝集剤中のMn、Ni及びZnの合計の含有率が0.05重量%以上5重量%以下、例えば0.1重量%以上2重量%以下である場合に本発明を適用すると効果的である。被処理水への鉄系無機凝集剤の添加量は、ジャーテストなどによって実験的に定めるのが好ましい。被処理水への鉄系無機凝集剤の添加量は、被処理水の水質等によっても異なるが、通常10~400mg/L程度である。
凝集処理後の固液分離としては、浮上分離又は沈降分離と、濾材層に通水する濾過とを併用することが望ましい。濾材としては、砂、アンスラサイトなどを用いることができる。
キレート系スケール抑制剤としては、エチレンジアミン四酢酸(EDTA)やニトリロ三酢酸(NTA)などが好適に用いられる。これらのキレート系スケール抑制剤は1種を単独で用いても良く、2種以上を併用しても良い。
スケール分散剤としては、(メタ)アクリル酸重合体及びその塩、マレイン酸重合体及びその塩などの低分子量ポリマー、エチレンジアミンテトラメチレンホスホン酸及びその塩、ヒドロキシエチリデンジホスホン酸及びその塩、ニトリロトリメチレンホスホン酸及びその塩、ホスホノブタントリカルボン酸及びその塩などのホスホン酸及びホスホン酸塩、ヘキサメタリン酸及びその塩、トリポリリン酸及びその塩などの無機重合リン酸及び無機重合リン酸塩などを使用することができる。これらのスケール分散剤は1種を単独で用いても良く、2種以上を併用しても良い。
スケール分散剤の添加量は、RO装置の給水である固液分離水に対して1~100mg/L程度とすることが好ましい。
HF排水処理水の模擬排水(Ca:100mg/L、F:13mg/L、pH3)を調製し、図1の通り反応槽1に導入し、水酸化ナトリウムを添加してpH=6~7に調整すると共に、塩化第二鉄を反応槽1内の濃度が150mg/Lとなるように添加した。この塩化第二鉄中のMn含有率は1重量%、Ni含有率は0.05重量%、Zn含有率は0.05重量%であった。反応槽1からの流出水を、凝集槽2に導入して、反応させた後、加圧浮上槽3で加圧浮上処理し、処理水を二層濾過器4(濾材:砂、アンスラサイト)にて濾過した。濾過器4の濾過水にキレート系スケール抑制剤としてウェルクリンA801(栗田工業製)を10mg/L添加し、スケール分散剤としてクリフロートN900(栗田工業製)を10mg/L添加し、次いでRO装置5にてRO膜処理した。RO膜は日東電工製ES-20であり、回収率は85%とした。RO装置5の脱塩率と差圧の経時変化を図2に示す。
キレート系スケール抑制剤を添加しなかったこと以外は実施例1と同一条件にて処理を行った。RO装置5の脱塩率と差圧の経時変化を図2に示す。
なお、本出願は、2012年1月11日付で出願された日本特許出願(特願2012-003287)に基づいており、その全体が引用により援用される。
Claims (8)
- 被処理水に鉄系無機凝集剤を添加し、固液分離した後、逆浸透装置で処理する逆浸透処理方法において、
該逆浸透装置への給水にキレート系スケール抑制剤とスケール分散剤とを添加することを特徴とする逆浸透処理方法。 - 請求項1において、キレート系スケール抑制剤は、エチレンジアミン四酢酸及び/又はニトリロ三酢酸であることを特徴とする逆浸透処理方法。
- 請求項1又は2において、スケール分散剤は(メタ)アクリル酸重合体及びその塩、並びにマレイン酸重合体及びその塩よりなる群から選ばれる少なくとも1種であることを特徴とする逆浸透処理方法。
- 請求項1ないし3のいずれか1項において、前記鉄系無機凝集剤は、Mn、Zn及びNiの合計の含有率が0.05重量%以上であることを特徴とする逆浸透処理方法。
- 請求項1ないし4のいずれか1項において、前記被処理水に前記鉄系無機凝集剤を10~400mg/L添加することを特徴とする逆浸透処理方法。
- 請求項1ないし5のいずれか1項において、前記キレート系スケール抑制剤の添加量が、前記給水中のMn、Zn及びNiの重金属合計当量の20倍量以上であることを特徴とする逆浸透処理方法。
- 請求項1ないし6のいずれか1項において、前記給水にスケール分散剤を1~200mg/L添加することを特徴とする逆浸透処理方法。
- 請求項1ないし7のいずれか1項において、前記被処理水に鉄系無機凝集剤を添加してpH4~8で凝集処理した後固液分離することを特徴とする逆浸透処理方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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KR1020147014515A KR102021627B1 (ko) | 2012-01-11 | 2012-12-21 | 역침투 처리 방법 |
CN201280066633.1A CN104039713B (zh) | 2012-01-11 | 2012-12-21 | 逆渗透处理方法 |
JP2013553236A JP6135511B2 (ja) | 2012-01-11 | 2012-12-21 | 逆浸透処理方法 |
SG11201403820YA SG11201403820YA (en) | 2012-01-11 | 2012-12-21 | Reverse osmosis treatment method |
Applications Claiming Priority (2)
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JP2012003287 | 2012-01-11 | ||
JP2012-003287 | 2012-01-11 |
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WO2013105421A1 true WO2013105421A1 (ja) | 2013-07-18 |
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PCT/JP2012/083288 WO2013105421A1 (ja) | 2012-01-11 | 2012-12-21 | 逆浸透処理方法 |
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JP (1) | JP6135511B2 (ja) |
KR (1) | KR102021627B1 (ja) |
CN (1) | CN104039713B (ja) |
SG (2) | SG10201700194QA (ja) |
TW (1) | TWI606014B (ja) |
WO (1) | WO2013105421A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002059194A (ja) * | 2000-08-23 | 2002-02-26 | Nippon Steel Corp | 原水の処理方法 |
JP2002191942A (ja) * | 2000-12-22 | 2002-07-10 | Sumitomo Heavy Ind Ltd | 排水処理方法 |
JP2003071252A (ja) * | 2001-09-06 | 2003-03-11 | Nitto Denko Corp | 多段式逆浸透処理方法 |
JP2006007145A (ja) * | 2004-06-28 | 2006-01-12 | Takuma Co Ltd | 一般ごみ焼却場排水の処理方法 |
JP2009006209A (ja) * | 2007-06-26 | 2009-01-15 | Toray Ind Inc | 中空糸膜モジュールの洗浄方法 |
JP2009066508A (ja) * | 2007-09-12 | 2009-04-02 | Kurita Water Ind Ltd | 有機物含有水の凝集処理方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05269463A (ja) | 1992-03-24 | 1993-10-19 | Kurita Water Ind Ltd | 膜分離装置 |
JP3752761B2 (ja) | 1997-01-16 | 2006-03-08 | 栗田工業株式会社 | 逆浸透膜処理方法 |
JP5029982B2 (ja) | 2005-06-07 | 2012-09-19 | 鶴見曹達株式会社 | 塩化鉄水溶液の精製法 |
JP5223219B2 (ja) | 2007-03-30 | 2013-06-26 | 栗田工業株式会社 | 有機性排水の処理装置 |
JP5348369B2 (ja) | 2008-03-31 | 2013-11-20 | 栗田工業株式会社 | 水処理方法 |
-
2012
- 2012-12-21 KR KR1020147014515A patent/KR102021627B1/ko active IP Right Grant
- 2012-12-21 CN CN201280066633.1A patent/CN104039713B/zh active Active
- 2012-12-21 WO PCT/JP2012/083288 patent/WO2013105421A1/ja active Application Filing
- 2012-12-21 JP JP2013553236A patent/JP6135511B2/ja active Active
- 2012-12-21 SG SG10201700194QA patent/SG10201700194QA/en unknown
- 2012-12-21 SG SG11201403820YA patent/SG11201403820YA/en unknown
- 2012-12-25 TW TW101149785A patent/TWI606014B/zh active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002059194A (ja) * | 2000-08-23 | 2002-02-26 | Nippon Steel Corp | 原水の処理方法 |
JP2002191942A (ja) * | 2000-12-22 | 2002-07-10 | Sumitomo Heavy Ind Ltd | 排水処理方法 |
JP2003071252A (ja) * | 2001-09-06 | 2003-03-11 | Nitto Denko Corp | 多段式逆浸透処理方法 |
JP2006007145A (ja) * | 2004-06-28 | 2006-01-12 | Takuma Co Ltd | 一般ごみ焼却場排水の処理方法 |
JP2009006209A (ja) * | 2007-06-26 | 2009-01-15 | Toray Ind Inc | 中空糸膜モジュールの洗浄方法 |
JP2009066508A (ja) * | 2007-09-12 | 2009-04-02 | Kurita Water Ind Ltd | 有機物含有水の凝集処理方法 |
Also Published As
Publication number | Publication date |
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CN104039713B (zh) | 2016-08-24 |
TW201343566A (zh) | 2013-11-01 |
JPWO2013105421A1 (ja) | 2015-05-11 |
SG10201700194QA (en) | 2017-03-30 |
KR20140109867A (ko) | 2014-09-16 |
SG11201403820YA (en) | 2014-11-27 |
JP6135511B2 (ja) | 2017-05-31 |
KR102021627B1 (ko) | 2019-11-04 |
CN104039713A (zh) | 2014-09-10 |
TWI606014B (zh) | 2017-11-21 |
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