CN101559313B - Method for reducing sewage discharge in washed method - Google Patents
Method for reducing sewage discharge in washed method Download PDFInfo
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- CN101559313B CN101559313B CN2008100362331A CN200810036233A CN101559313B CN 101559313 B CN101559313 B CN 101559313B CN 2008100362331 A CN2008100362331 A CN 2008100362331A CN 200810036233 A CN200810036233 A CN 200810036233A CN 101559313 B CN101559313 B CN 101559313B
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Abstract
The invention discloses a method for reducing sewage discharge in a washed method. Washing water after washing of a washing tower flows into at least one absorption tower filled with gas absorbent material; gas in the washing water is absorbed to obtain absorbate, and water after absorption is returned to the washing tower for cycle use. The gas absorbent material absorbs the gas to obtain a subsidiary product with economic value. A reservoir is additionally arranged between the absorption tower and the washing tower, and the capacity of the reservoir is large enough for storing water for the continuous use of the washing tower. In the invention, the water flowing out from the washing tower flows into the absorption tower filled with little gas absorbent material, gas dissolving in the water is absorbed through the absorption tower, and obtained water is again returned to the washing tower for cycle use. The subsidiary product obtained after washing water is absorbed through the absorption tower, can be reused and has economic value.
Description
Technical field
The present invention relates to a kind of method that reduces sewage discharge in washed method.Be suitable for water-fast gas products or have a small amount of water-soluble gas products, remove in a small amount of water-soluble serialization WATER-WASHING METHOD commercial production.
Background technology
During at present industrial technology is produced, tend to leave small amounts of water soluble gas in the water-fast gas products (like most of organic gas) that obtains through chemical reaction, referring to Fig. 1; Usual method adopts through water scrubber 1; Gas products passes through through water scrubber 1 from bottom to top, and water sprays from water scrubber from top to bottom, thereby reaches the small amounts of water soluble GAS ABSORPTION in the gas products; Water after the cleaning directly discharges, and often produces a large amount of sewage.
In today of socio-economic development, People more and more is paid attention to environmental protection, and energy savings reduces sewage discharge, and economic benefit and social benefit are significant.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that reduces sewage discharge in washed method, to reduce sewage emissions in the present WATER-WASHING METHOD.
Technical problem to be solved by this invention can realize through following technical scheme:
A kind of method that reduces sewage discharge in washed method; It is characterized in that; To flow at least one by the washings after the water scrubber washing and be equipped with in the absorption tower of GAS ABSORPTION thing, the gas in the washings is absorbed the thing that is absorbed, the water after the absorption sends back in the water scrubber again and recycles.
In the method for the invention, obtain the accessory substance of economic worth after the reaction of said GAS ABSORPTION thing and said GAS ABSORPTION.
Said accessory substance can be liquid or solid, when said accessory substance is liquid, can uses the method for conventional industrially drying accessory substance is handled, and obtains the product of solid.
In the method for the invention, described absorption tower is preferably 2-4.
In the method for the invention, can also between said absorption tower and described water scrubber, increase by a cistern.The molten long-pending of said cistern is the volume that can enough store the water of water scrubber serialization use.
In said method, described gas is preferably hydrogen chloride, hydrogen fluoride.Described GAS ABSORPTION thing is metal oxide or alkali.Described metal oxide is preferably magnesia, a kind of in the oxide of alundum (Al, iron, the Cu oxide.Described alkali is preferably a kind of in potassium hydroxide, NaOH, calcium hydroxide, the ammonia.
In said method; Employed absorption tower has at least one convenient inlet of placing described GAS ABSORPTION thing, and at least one conveniently takes out the outlet of described accessory substance and is provided with absorption detecting system and at least one cover GAS ABSORPTION thing consumption detection device in the cover at least.
Owing to adopted technical scheme as above; The water that the present invention will be flowed out from water scrubber washing back flows into one the absorption tower that little of gas absorbs thing is housed, behind this tower; " gas " soluble in water is absorbed, and the water that obtains sends back in the water scrubber again and recycles.Water after the washing absorbs through the absorption tower, obtains by product, can utilize economically valuable once more.
If the material that water (containing small amounts of water soluble gas) that washing is used and the reaction of the GAS ABSORPTION thing in the absorption tower produce is water-soluble; From the absorption tower, come out so for the aqueous solution of product; The dry method of applicable industry is handled it; Can obtain the product of solid, just handle the by product of water, this by product economically valuable.
If the material that water (containing small amounts of water soluble gas) that washing is used and the reaction of the GAS ABSORPTION thing in the absorption tower produce is water-fast; Just do not contained water-soluble gas in the water that from the absorption tower, comes out so; This water can directly carry out recycle, and the solid product that generates regularly directly gets final product the product taking-up from the absorption tower; Be the by product that water treatment obtains, this by product economically valuable.
The present invention is through increasing the cistern that can enough store the water of water scrubber serialization use.The water of cistern can come the water of the purifying of free little of gas absorption plant, and the water that the washing that also can make a fresh start is used is sent into water scrubber to guarantee enough water.
The water that the present invention will be flowed out from common water scrubber washing back; Flow into an absorption tower (little of gas is housed in the tower absorbs thing), behind this tower, " gas " soluble in water is absorbed; The water that obtains send cistern again; Enough water in the cistern is sent into and is washed washing use in the tower, and so, water can recycle.Significantly reduce sewage emissions.Obtain by product in the absorption process and can be used as other chemicals again and use voluntarily or sell, thereby can fully utilize.
Description of drawings
Fig. 1 is the structural representation of existing water wash system.
Fig. 2 is the structural representation of water wash system of the present invention.
The specific embodiment
For making technological means and methods for using them of the present invention be more prone to understand,, the present invention is done further elaboration below in conjunction with concrete embodiment.
Referring to Fig. 2, a kind of method that reduces sewage discharge in washed method will flow into 2-4 by the washings after water scrubber 1 washing and be equipped with in the absorption tower 2 of GAS ABSORPTION thing; Gas in the washings absorbs the thing that is absorbed, and behind this absorption tower 2, " gas " soluble in water is absorbed; The water that obtains is sent into cistern 3 earlier; Send back to washing in the water scrubber 1 afterwards, recycle, reduce sewage discharge.As a rule, the accessory substance of economic worth should be obtained after GAS ABSORPTION thing and the GAS ABSORPTION reaction, the economic benefit of entire method can be improved like this.When if accessory substance is liquid, can use the method for conventional industrially drying accessory substance is handled, obtain the product of solid.
This method is fit to contain hydrogen chloride, the washings of hydrogen fluoride gas.The GAS ABSORPTION thing that adopts like this is metal oxide or alkali.Metal oxide is preferably magnesia, a kind of in the oxide of alundum (Al, iron, the Cu oxide.Described alkali is preferably a kind of in potassium hydroxide, NaOH, calcium hydroxide, the ammonia.
The absorption tower 2 of present embodiment has a convenient inlet of placing described GAS ABSORPTION thing, and one is conveniently taken out the outlet of described accessory substance and is provided with an absorption detecting system and a cover GAS ABSORPTION thing consumption detection device in the cover.To those skilled in the art, absorption detecting system and GAS ABSORPTION thing consumption detection device are known, and repeat no more at this.
Embodiment 1:
Contain a spot of water-soluble gas hydrogen fluoride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen fluoride wherein is dissolved in the water, separate with organic products.Then having dissolved hydrofluoric water again through another one absorption tower 2; In this absorption tower 2 potassium hydroxide of containing solid is arranged; The hydrogen fluoride and the potassium hydroxide that are dissolved in the water carry out neutralization reaction in tower, the potassium fluoride of the generation aqueous solution that obtains potassium fluoride soluble in water.Distill this solution or spray-drying, obtain the solid potassium fluoride, this solid can replace the potassium fluoride of industry to use, and the water that distillation obtains can be got back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen fluoride of organic gas.Reaction equation is following:
HF+KOH＝KF+H
2O
Embodiment 2:
Contain a spot of water-soluble gas hydrogen fluoride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen fluoride wherein is dissolved in the water, separate with organic products.Then having dissolved hydrofluoric water again through another one absorption tower 2; In this absorption tower 2 sodium hydrate solid of containing is arranged; The hydrogen fluoride and the NaOH that are dissolved in the water carry out neutralization reaction in tower, the sodium fluoride of generation is insoluble in water, obtains the solid and the backwater of sodium fluoride.Regularly remove the sodium fluoride solid in the absorption tower, this solid can replace the sodium fluoride of industry to use, and the backwater that obtains can turn back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen fluoride of organic gas.Reaction equation is following:
HF+NaOH＝NaF+H
2O
Embodiment 3:
Contain a spot of water-soluble gas hydrogen fluoride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen fluoride wherein is dissolved in the water, separate with organic products.Then having dissolved hydrofluoric water again through another one absorption tower 2; In this absorption tower 2 calcium hydroxide of containing solid is arranged; The hydrogen fluoride and the calcium hydroxide that are dissolved in the water carry out neutralization reaction in tower, the calcirm-fluoride of generation is insoluble in water, obtains the solid and the backwater of calcirm-fluoride.Regularly remove the calcirm-fluoride solid in the absorption tower, this solid can replace the calcirm-fluoride of industry to use, and the backwater that obtains can turn back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen fluoride of organic gas.Reaction equation is following:
2HF+Ca(OH)
2＝CaF
2+2H
2O
Embodiment 4:
Contain a spot of water-soluble gas hydrogen chloride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen chloride wherein is dissolved in the water, separate with organic products.Pass through another one absorption tower 2 to the water that has dissolved hydrogen chloride more then; In this absorption tower 2 potassium hydroxide of containing solid is arranged; The hydrogen chloride and the potassium hydroxide that are dissolved in the water carry out neutralization reaction in tower, the potassium chloride of the generation aqueous solution that obtains potassium chloride soluble in water.Distill this solution or spray-drying, obtain solid potassium chloride, this solid can replace the potassium chloride of industry to use, and the water that distillation obtains can be got back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen chloride of organic gas.Reaction equation is following:
HCl+KOH＝KCl+H
2O
Embodiment 5:
Contain a spot of water-soluble gas hydrogen chloride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen chloride wherein is dissolved in the water, separate with organic products.Pass through another one absorption tower 2 to the water that has dissolved hydrogen chloride more then; In this absorption tower 2 sodium hydrate solid of containing is arranged; The hydrogen chloride and the NaOH that are dissolved in the water carry out neutralization reaction in tower, the sodium chloride of the generation aqueous solution that obtains sodium chloride soluble in water.Distill this solution or spray-drying, obtain solid sodium chloride, this solid can replace the sodium chloride of industry to use, and the water that distillation obtains can be got back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen chloride of organic gas.Reaction equation is following:
HCl+NaOH＝NaCl+H
2O
Embodiment 6:
Contain a spot of water-soluble gas hydrogen chloride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen chloride wherein is dissolved in the water, separate with organic products.Pass through another one absorption tower 2 to the water that has dissolved hydrogen chloride more then; In this absorption tower 2 calcium hydroxide of containing solid is arranged; The hydrogen chloride and the calcium hydroxide that are dissolved in the water carry out neutralization reaction in tower, the calcium chloride of the generation aqueous solution that obtains calcium chloride soluble in water.Distill this solution or spray-drying, obtain solid calcium chloride, this solid can replace the calcium chloride of industry to use, and the water that distillation obtains can be got back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen chloride of organic gas.Reaction equation is following:
2HCl+Ca(OH)
2＝CaCl
2+2H
2O
Embodiment 7:
Contain a spot of water-soluble gas hydrogen fluoride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen fluoride wherein is dissolved in the water, separate with organic products.Then having dissolved hydrofluoric water again through another one absorption tower 2; The potassium hydroxide of containing and boric acid solid are arranged in this absorption tower; Hydrogen fluoride and the potassium hydroxide and the boric acid that are dissolved in the water carry out neutralization reaction in tower, the potassium fluoborate of generation is insoluble in water, obtains potassium fluoborate solid and backwater.Regularly remove the potassium fluoborate solid in the absorption tower 2, this solid economically valuable, the backwater that obtains can turn back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen fluoride of organic gas.Reaction equation is following:
4HF+KOH+H
3BO
3＝KBF
4+4H
2O
Embodiment 8:
Contain a spot of water-soluble gas hydrogen fluoride in the organic gas product, pass through first water scrubber 1 to this gas earlier, hydrogen fluoride wherein is dissolved in the water, separate with organic products.Then having dissolved hydrofluoric water again through another one absorption tower 2; In this absorption tower 2 magnesia of containing solid is arranged; The hydrogen fluoride and the magnesia that are dissolved in the water carry out neutralization reaction in tower, the magnesium fluoride of generation is insoluble in water, obtains the solid and the backwater of magnesium fluoride.Regularly remove the magnesium fluoride solid in the absorption tower, this solid can replace the magnesium fluoride of industry to use, and the backwater that obtains can turn back in first water scrubber 1, and circulation is used for absorbing the water miscible hydrogen fluoride of organic gas.Reaction equation is following:
2HF+MgO＝MgF
2+H
2O
Claims (7)
1. method that reduces sewage discharge in washed method; It is characterized in that; To be flowed at least one by the washings after the water scrubber washing is equipped with in the absorption tower of GAS ABSORPTION thing; Dissolved gases in the said washings is carried out absorption reaction, obtain the accessory substance of economic worth behind said GAS ABSORPTION thing and the said dissolved gases absorption reaction, the water behind the absorption reaction sends back to again in the said water scrubber and recycles;
Said dissolved gases is hydrogen chloride or hydrogen fluoride;
Said GAS ABSORPTION thing is metal oxide or alkali.
2. the method for minimizing sewage discharge in washed method as claimed in claim 1 is characterized in that, said accessory substance is a liquid or solid.
3. the method for minimizing sewage discharge in washed method as claimed in claim 2 is characterized in that, when said accessory substance is liquid, uses the method for conventional industrially drying accessory substance is handled, and obtains the product of solid.
4. the method for minimizing sewage discharge in washed method as claimed in claim 1 is characterized in that, described absorption tower is 2-4.
5. the method for minimizing sewage discharge in washed method as claimed in claim 1 is characterized in that, between said absorption tower and described water scrubber, increases by a cistern, and the volume of said cistern is a volume of enough storing the water of water scrubber serialization use.
6. the method for minimizing sewage discharge in washed method as claimed in claim 1 is characterized in that, described metal oxide is a kind of in the oxide, Cu oxide of magnesia, alundum (Al, iron; Described alkali is a kind of in potassium hydroxide, NaOH, calcium hydroxide, the ammonia.
7. the method for minimizing sewage discharge in washed method as claimed in claim 1; It is characterized in that; Employed absorption tower has at least one convenient inlet of placing described GAS ABSORPTION thing, and at least one conveniently takes out the outlet of described accessory substance and is provided with a cover absorption detecting system and an at least one cover GAS ABSORPTION thing consumption detection device at least.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100362331A CN101559313B (en) | 2008-04-18 | 2008-04-18 | Method for reducing sewage discharge in washed method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100362331A CN101559313B (en) | 2008-04-18 | 2008-04-18 | Method for reducing sewage discharge in washed method |
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| CN101559313A CN101559313A (en) | 2009-10-21 |
| CN101559313B true CN101559313B (en) | 2012-08-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2535618A1 (en) * | 1982-11-10 | 1984-05-11 | Steinmueller Gmbh L & C | CONTINUOUS EXTRACTION PROCESS FOR WASH SUSPENSION IN FUME GAS DESULFURIZATION PLANTS |
| CN1347862A (en) * | 2001-10-08 | 2002-05-08 | 浙江衢化氟化学有限公司 | Gas and solid phase catalytic process of synthesizing methane chloride |
| CN1843569A (en) * | 2006-03-13 | 2006-10-11 | 董谊仁 | Gas-purifying combined absorbing tower and application thereof |
| CN1887405A (en) * | 2005-06-27 | 2007-01-03 | 成都华西化工研究所 | Process of removing and recovering CO2 from fume |
-
2008
- 2008-04-18 CN CN2008100362331A patent/CN101559313B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2535618A1 (en) * | 1982-11-10 | 1984-05-11 | Steinmueller Gmbh L & C | CONTINUOUS EXTRACTION PROCESS FOR WASH SUSPENSION IN FUME GAS DESULFURIZATION PLANTS |
| CN1347862A (en) * | 2001-10-08 | 2002-05-08 | 浙江衢化氟化学有限公司 | Gas and solid phase catalytic process of synthesizing methane chloride |
| CN1887405A (en) * | 2005-06-27 | 2007-01-03 | 成都华西化工研究所 | Process of removing and recovering CO2 from fume |
| CN1843569A (en) * | 2006-03-13 | 2006-10-11 | 董谊仁 | Gas-purifying combined absorbing tower and application thereof |
Non-Patent Citations (3)
| Title |
|---|
| JP昭55-111828A 1980.08.28 |
| JP昭55-119490A 1980.09.13 |
| JP特開2002-210324A 2002.07.30 |
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Denomination of invention: Method for reducing sewage discharge in washed method Effective date of registration: 20140515 Granted publication date: 20120808 Pledgee: Bank of Shanghai Limited by Share Ltd Pudong branch Pledgor: Shanghai Waysmos Fine Chemical Co., Ltd. Registration number: 2014310000023 |
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