JP2000202444A - Sea water desalting method capable of inexpensively generating fresh water - Google Patents

Sea water desalting method capable of inexpensively generating fresh water

Info

Publication number
JP2000202444A
JP2000202444A JP11008685A JP868599A JP2000202444A JP 2000202444 A JP2000202444 A JP 2000202444A JP 11008685 A JP11008685 A JP 11008685A JP 868599 A JP868599 A JP 868599A JP 2000202444 A JP2000202444 A JP 2000202444A
Authority
JP
Japan
Prior art keywords
water
sea water
sea
seawater
low salt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11008685A
Other languages
Japanese (ja)
Inventor
Kazuya Akine
一矢 秋子
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP11008685A priority Critical patent/JP2000202444A/en
Publication of JP2000202444A publication Critical patent/JP2000202444A/en
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Landscapes

  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce the output of a high pressure pump and to decrease the quantity of ion moving with electric power by digging sea bottom to obtain ground water or boring to take out water from ground water vein to use as raw water for low salt sea water desalting facility. SOLUTION: The sea bottom is dug to obtain the ground water or low salt sea water is taken out from the ground water vein or a hydrate layer by boring 1 and the resultant water is charged to the low salt sea water desalting device 4 and desalted. If the line becomes inconvenient, temporary operation is performed by changing to the use of a standard sea water taking-out 11 and a standard sea water desalting device 14 of another line provided in parallel. As a result, the osmotic pressure is lowered with the decrease of the concentration of salt and the output of the high pressure pump is also reduced. In the case of using the low salt sea water containing 10-20% sea water, ordinary cost is reduced into 50% of that of normal sea water desalting and the consumption of power is decreased.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は陸上用、水道水用の
大型海水淡水化方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-scale seawater desalination method for land use and tap water.

【０００２】[0002]

【従来の技術】従来の海水淡水化施設では海中に取水管
を入れ標準塩分の海水を取水していた。又沖縄県の離島
には、かん水だけを取水する海水淡水化施設は有る。2. Description of the Related Art In a conventional seawater desalination facility, an intake pipe is inserted into the sea to take in seawater having a standard salt content. There are seawater desalination facilities on remote islands in Okinawa Prefecture that collect only brine.

【０００３】[0003]

【発明が解決しようとする課題】将来の水資源としての
ダムは建設に伴う環境対策への投資も激増し、既存のダ
ムは残留農薬やごみ処理場の廃液に脅かされ、河に造っ
た取水場は残留農薬や洗剤をよびこむ。[Problems to be solved by the invention] Dams as water resources in the future will dramatically increase investment in environmental measures accompanying construction, and existing dams will be threatened by residual pesticides and wastewater from garbage treatment plants, and water will be created in rivers Places ingest pesticide residues and detergents.

【０００４】最近では地球規模の気象異変や、山の水涵
養力低下、人口の都市集中などで水資源が枯渇し止むを
得ず海水淡水化施設がふえ始め、沖縄県では水道料金１
立方メートル当り約１４８円なのに造水コスト約３４４
円（国庫補助金を入れるとコスト約１７０円）の逆浸透
法海水淡水化大型プラントが営業運転に入った。此の海
淡の高コストを下げる事が課題である。[0004] Recently, seawater desalination facilities have started to increase due to the depletion of water resources due to global-scale meteorological abnormalities, a decrease in water recharge of mountains, and the concentration of population in urban areas.
Approximately 148 yen per cubic meter, but water production cost is about 344
A large-scale reverse osmosis seawater desalination plant with a yen (cost of about 170 yen including the national treasury subsidy) has entered commercial operation. The challenge is to reduce the high cost of this sea bottom.

【０００５】[0005]

【課題を解決するための手段】地下水を求めて海底を掘
って行き、或はボーリングで地下水脈、或は含水層より
取水して低塩分海水淡水化施設の源水とする。又海底よ
り海中に自湧する地下水でも良く、更に旧炭坑の海底廃
坑中に貯まったかん水を取水するも良い。Means for Solving the Problems The seabed is dug for groundwater, or water is taken from a groundwater vein or a water-bearing layer by boring to be used as a source water for a low-salinity seawater desalination facility. It is also possible to use groundwater spontaneously flowing into the sea from the seabed, and also to collect brine from abandoned pits in old coal mines.

【０００６】[0006]

【発明の実施の形態】海底地下で１００％真水を求める
事は至難の業であり、莫大な高コストになるので９０％
〜８０％真水程度のものを通常運転用の低塩分海水淡水
化装置に入れる。海底地下水では地下水脈が枯れる等の
恐れや落盤の心配も有るので非常臨時運転用として平行
設置した標準海水取水淡水化装置系統に切替ることが可
能なプラントにする。DESCRIPTION OF THE PREFERRED EMBODIMENTS It is extremely difficult to obtain 100% fresh water under the seabed, and it is enormous and expensive to use 90%.
About 80% of fresh water is put into a low-salinity seawater desalination apparatus for normal operation. In the case of submarine groundwater, there is a danger that the groundwater vein will wither, etc. and there will be a risk of falling. Therefore, the plant should be able to switch to a standard seawater intake and desalination system installed in parallel for emergency temporary operation.

【０００７】[0007]

【発明の効果】今までの地表水系のダム、或は大堰、水
路、導水管、浄水場の合計建設費に比べ、低塩分海水か
通常海水かを使い別ける本発明の海水淡水化施設の建設
費は約３０％〜５０％ですむ。 経常コスト比較は逆浸
透海水淡水化法では塩分濃度が低くなれば浸透圧が低く
なり、高圧ポンプ出力も少なくてすみ、海水１０％〜２
０％含みの低塩分海水ならば経常コストは通常海水淡水
化の約５０％ですむ。又電気透析海水淡水化法でも塩分
濃度が低くなれば電力で移動させるイオン量が少なくて
すみ電力消費が少なくなる。従来の海淡方法では電力量
がコストの約３割を要しているので本発明のコスト低減
効果は絶大である。According to the present invention, the construction of the seawater desalination facility according to the present invention, in which low salinity seawater or normal seawater is used, is compared with the total construction cost of the surface water dams or large weirs, waterways, water pipes, and water purification plants. The cost is about 30% -50%. Ordinary cost comparison shows that in the reverse osmosis seawater desalination method, the lower the salt concentration, the lower the osmotic pressure, the lower the output of the high-pressure pump, and 10% to 2% of seawater.
For low salt seawater containing 0%, the ordinary cost is usually about 50% of seawater desalination. Also, in the electrodialysis seawater desalination method, if the salt concentration is low, the amount of ions to be moved by electric power is small, and the power consumption is reduced. In the conventional desalination method, the amount of power requires about 30% of the cost, so that the cost reduction effect of the present invention is enormous.

【０００８】故に海岸都市で水資源のさしせまった都市
に本発明を提唱する。但し海底地下水が汚染したり、海
底陥没の出る恐れの有る地点は避けねばならぬのは勿論
である。Therefore, the present invention is proposed in a coastal city where water resources are impaired. However, it is necessary to avoid points where there is a risk of contaminating the seabed groundwater or sinking in the seabed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明のフローシート図FIG. 1 is a flow sheet diagram of the present invention.

【図２】本発明のフローシート図FIG. 2 is a flow sheet diagram of the present invention.

【符号の説明】[Explanation of symbols]

１ 低塩分海水取水 １１ 標準海水取
水 ２ 前処理槽 １２ 前処理槽 ３ ポンプ １３ 高圧ポンプ ４ 低塩分海水淡水化装置 １４ 標準海水淡
水化装置 ５ 後処理槽 １５ 後処理槽 ６ 淡水貯水槽 ２１ 低塩分海水取水 ３１ 標準海水取
水 ２２ 前処理槽 ３２ 前処理槽 ２３ ポンプ ３３ 高圧ポンプ ２４ 低塩分海水淡水化装置 ３４ 標準海水淡
水化装置 ２５ 後処理槽 ３５ 後処理槽 ２６ バルブ ３６ バルブ ２７ 淡水貯水槽DESCRIPTION OF SYMBOLS 1 Low salt seawater intake 11 Standard seawater intake 2 Pretreatment tank 12 Pretreatment tank 3 Pump 13 High pressure pump 4 Low salt seawater desalination equipment 14 Standard seawater desalination equipment 5 Posttreatment tank 15 Posttreatment tank 6 Freshwater tank 21 Low salt Seawater intake 31 Standard seawater intake 22 Pretreatment tank 32 Pretreatment tank 23 Pump 33 High pressure pump 24 Low salt seawater desalination equipment 34 Standard seawater desalination equipment 25 Posttreatment tank 35 Posttreatment tank 26 Valve 36 Valve 27 Freshwater storage tank

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 通常造水運転としては低塩分海水を取水
１し、低塩分海水淡水化装置４に入れて淡水化する系統
を用いる。此の系統の不都合の時は、平行して設けた別
の系統の標準海水取水１１及び標準海水淡水化装置１４
使用に切替えて臨時運転することを特徴とする海水淡水
化方法。1. As a normal desalination operation, a system is used in which low-salinity seawater is taken in 1 and put into a low-salinity seawater desalination apparatus 4 to be desalinated. In case of inconvenience of this system, the standard seawater intake 11 and the standard seawater desalination device 14 of another system provided in parallel
A seawater desalination method comprising switching to use and operating temporarily. 【請求項２】 通常造水運転としては低塩分海水を取水
２１し、まず低塩分海水淡水化装置２４をとおし濃くな
った海水を標準海水淡水化装置３４に更に導き淡水化す
る系統を用いる。此の系統の不都合の時は標準海水取水
３１を使い、バルブ２６を閉し、バルブ３６を開し、標
準海水淡水化装置３４に導き、淡水化臨時運転すること
を特徴とする海水淡水化方法。2. As a normal desalination operation, a system is used in which low-salinity seawater is taken in, and first, seawater that has been made thicker through a low-salinity seawater desalination device is further guided to a standard seawater desalination device for desalination. When this system is inconvenient, a standard seawater intake 31 is used, the valve 26 is closed, the valve 36 is opened, and the system is guided to the standard seawater desalination apparatus 34, and the desalination is temporarily operated. .
JP11008685A 1999-01-18 1999-01-18 Sea water desalting method capable of inexpensively generating fresh water Pending JP2000202444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11008685A JP2000202444A (en) 1999-01-18 1999-01-18 Sea water desalting method capable of inexpensively generating fresh water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11008685A JP2000202444A (en) 1999-01-18 1999-01-18 Sea water desalting method capable of inexpensively generating fresh water

Publications (1)

Publication Number Publication Date
JP2000202444A true JP2000202444A (en) 2000-07-25

Family

ID=11699787

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11008685A Pending JP2000202444A (en) 1999-01-18 1999-01-18 Sea water desalting method capable of inexpensively generating fresh water

Country Status (1)

Country Link
JP (1) JP2000202444A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6475460B1 (en) 1999-07-12 2002-11-05 Marine Desalination Systems Llc Desalination and concomitant carbon dioxide capture yielding liquid carbon dioxide
US6497794B1 (en) 1999-07-12 2002-12-24 Marine Desalination Systems L.L.C. Desalination using positively buoyant or negatively buoyant/assisted buoyancy hydrate
US6531034B1 (en) 1999-07-12 2003-03-11 Marine Desalination Sys6Tems, L.L.P. Land-based desalination using positively buoyant or negatively buoyant/assisted buoyancy hydrate
US6673249B2 (en) 2000-11-22 2004-01-06 Marine Desalination Systems, L.L.C. Efficiency water desalination/purification
US6767471B2 (en) 1999-07-12 2004-07-27 Marine Desalination Systems, L.L.C. Hydrate desalination or water purification
US6830682B2 (en) 2000-06-26 2004-12-14 Marine Desalination Systems, L.L.C. Controlled cooling of input water by dissociation of hydrate in an artificially pressurized assisted desalination fractionation apparatus
US6890444B1 (en) 2003-04-01 2005-05-10 Marine Desalination Systems, L.L.C. Hydrate formation and growth for hydrate-based desalination by means of enriching water to be treated
US6969467B1 (en) 1999-07-12 2005-11-29 Marine Desalination Systems, L.L.C. Hydrate-based desalination with hydrate-elevating density-driven circulation
US7008544B2 (en) 2002-05-08 2006-03-07 Marine Desalination Systems, L.L.C. Hydrate-based desalination/purification using permeable support member
US7255794B2 (en) 1999-07-12 2007-08-14 Marine Desalination Systems, Llc Hydrate-based reduction of fluid inventories and concentration of aqueous and other water-containing products

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6733667B2 (en) 1999-07-12 2004-05-11 Marine Desalination Systems L.L.C. Desalination using positively buoyant or negatively buoyant/assisted buoyancy hydrate
US6475460B1 (en) 1999-07-12 2002-11-05 Marine Desalination Systems Llc Desalination and concomitant carbon dioxide capture yielding liquid carbon dioxide
US6531034B1 (en) 1999-07-12 2003-03-11 Marine Desalination Sys6Tems, L.L.P. Land-based desalination using positively buoyant or negatively buoyant/assisted buoyancy hydrate
US6562234B2 (en) 1999-07-12 2003-05-13 Marine Desalination Systems L.L.C. Land-based desalination using positively buoyant or negatively buoyant/assisted buoyancy hydrate
US6565715B1 (en) 1999-07-12 2003-05-20 Marine Desalination Systems Llc Land-based desalination using buoyant hydrate
US7255794B2 (en) 1999-07-12 2007-08-14 Marine Desalination Systems, Llc Hydrate-based reduction of fluid inventories and concentration of aqueous and other water-containing products
US6497794B1 (en) 1999-07-12 2002-12-24 Marine Desalination Systems L.L.C. Desalination using positively buoyant or negatively buoyant/assisted buoyancy hydrate
US6767471B2 (en) 1999-07-12 2004-07-27 Marine Desalination Systems, L.L.C. Hydrate desalination or water purification
US6969467B1 (en) 1999-07-12 2005-11-29 Marine Desalination Systems, L.L.C. Hydrate-based desalination with hydrate-elevating density-driven circulation
US6830682B2 (en) 2000-06-26 2004-12-14 Marine Desalination Systems, L.L.C. Controlled cooling of input water by dissociation of hydrate in an artificially pressurized assisted desalination fractionation apparatus
US6991722B2 (en) 2000-09-07 2006-01-31 Marine Desalination Systems, L.L.C. Hydrate desalination for water purification
US6673249B2 (en) 2000-11-22 2004-01-06 Marine Desalination Systems, L.L.C. Efficiency water desalination/purification
US7008544B2 (en) 2002-05-08 2006-03-07 Marine Desalination Systems, L.L.C. Hydrate-based desalination/purification using permeable support member
US6890444B1 (en) 2003-04-01 2005-05-10 Marine Desalination Systems, L.L.C. Hydrate formation and growth for hydrate-based desalination by means of enriching water to be treated

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