CN101844826A - Treatment method of carbon dioxide - Google Patents
Treatment method of carbon dioxide Download PDFInfo
- Publication number
- CN101844826A CN101844826A CN200910132466A CN200910132466A CN101844826A CN 101844826 A CN101844826 A CN 101844826A CN 200910132466 A CN200910132466 A CN 200910132466A CN 200910132466 A CN200910132466 A CN 200910132466A CN 101844826 A CN101844826 A CN 101844826A
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- waste water
- carbonic acid
- acid gas
- water
- described waste
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides a method for lowering pH of chemically treated waste water by injecting carbon dioxide, especially waste water from steel and iron manufacturing plants. The carbon dioxide is injected at different stages in the waste water chemical treatment process so as to lower the pH of the waste water and reduce the temporary hardness thereof, which makes the waste water be recycled or discharged conveniently.
Description
Technical field
The present invention relates to different steps injecting carbon dioxide by the waste water chemical treating process and come alkaline waste water in process for producing factory such as the Iron and Steel Production factory.
Background technology
The pH of the waste water stream in the Iron and Steel Production factory is about 9 usually, but often surpasses 12.Though under this pH, can carry out good production operation, when re-using waste water or waste water must be reduced this pH to meet environment and other rules when factory discharging.Most water treatment plant all requires the pH of ejecta to remain on 6-9, and must further meet technology and rule request than soft.
A kind of traditional method that reduces waste water ph is with the acid treatment waste water as sulfuric acid or hydrochloric acid.This method can not reduce the temporary hardness of waste water, and has increased the concentration and the electrical conductivity of water of sulfate radical or chlorion according to employed acid.
The another kind of method that reduces the pH value of waste water is to introduce an amount of carbonic acid gas in water.The carbonic acid gas normally diffusion system by certain type imports that gas feed injects.Can also use the mechanically mixing device to raise the efficiency.Perhaps, can carbonic acid gas be injected water by Venturi jet, this injector can suck the logistics of carbonic acid gas.
The present invention uses carbonic acid gas to reduce the pH and the temporary hardness of waste water in chemical treatment waste water process, and can significantly not change the specific conductivity of waste water.
Summary of the invention
The invention provides in the waste water chemical treating process to waste water adding carbonic acid gas, with the pH of reduction waste water and the method for hardness from Iron and Steel Production factory.The present invention does not have obviously to change the specific conductivity of waste water.Manageable waste water is the recirculated water of converter normally, and other have the waste water of high pH and/or high temporary hardness in the recirculated water of blast furnace and the Iron and Steel Production factory.
The system that this method is used comprises liquid carbon dioxide jar, evaporation unit, Controlling System device and diffusion system.Liquid carbon dioxide uses the diffusion system operate under specified pressure to inject waste water stream after by vaporizer, strainer, pressure regulator valve.The flow of carbonic acid gas can be regulated according to the signal of receiving from the downstream, at the pH of this waste water system of measured downstream; According to the flow velocity of waste water and the pH of waste water, desirable carbonic acid gas flow velocity be the 5-500 kilogram/hour.
The carbonic acid gas diffusion system is selected from down group: use diffusion flexible pipe direct injection carbonic acid gas; Carbonic acid gas is dissolved in the water, then carbonated water is injected waste water stream; Use nozzle with carbon dioxide jet in waste pipe; Use Venturi jet that carbonic acid gas is sucked in the waste water.
When the pH very high (＞8) of waste water, can adopt the staging treating method, realize continuing to reduce the pH of the water of handling, reduce fouling and reduce the cost of wastewater treatment.
Description of drawings
This figure is the synoptic diagram of the chemical treatment waste water system of use carbonic acid gas of the present invention.
Embodiment
The invention provides a kind of improved method that reduces the pH of waste water during chemical treatment waste water, its improvement comprises introduces waste water with carbonic acid gas.Described chemical treatment comprises introduces chemical reagent in waste water.Described chemical reagent is selected from down group: flocculation agent, flocculation load agent (flocculation-supporting reagent), corrosion inhibitor and scale inhibitor.
Carrying out before or after the chemical treatment carbonic acid gas being introduced waste water.Can carbonic acid gas be introduced waste water in a position or a plurality of position.When the pH of waste water greater than 8 the time, can in carrying out chemically treated waste water, introduce carbonic acid gas.Introduce the temporary hardness that carbonic acid gas also reduces waste water.
Waste water is usually from the Iron and Steel Production device, and waste water can be selected from down group: converter recirculated water, circulation water of blast furnace and other waste water.
Can carbonic acid gas be introduced waste water by diffusion system.The facility diffusion system is selected from down group: diffusion flexible pipe, the injection device of water-soluble carbonic acid gas, nozzle and vent fan.
Under a chemical treatment or two or more chemically treated situations, carbonic acid gas is added Waste Water Treatment.
The present invention also provides the system that carbonic acid gas is introduced waste water stream, and this system comprises storage tank; Evaporation unit; Processing control apparatus and dispersion device.
Storage tank contains carbonic acid gas.Evaporation unit also comprises strainer and pressure regulator valve.Dispersion device is selected from diffusion flexible pipe, nozzle and vent fan.
Referring to accompanying drawing, this illustrates the system 10 that is used to control high pH waste water again.The flow velocity of import waste water stream 1 is a 500-1200 rice
3/ hour.The pH value of this waste water is usually greater than 11.2, and in the 9.5-12.5 range, the total hardness of waste water stream is 350-650 milligram CaCO
3/ liter, temporary hardness is 140-530 milligram CaCO
3/ liter.The required technical requirements of the outlet waste water stream 7 after the processing is that pH is 6-9, NTU＜5 and COD＜50 mg/litre.
For reducing temporary hardness and preventing from first carbonic acid gas 3 to be distributed in the storage tank 2 CO in storage tank 2 by pipeline scale
3 2-Negatively charged ion and Mg
2+And Ca
2+Therefore cationoid reaction has reduced the temporary hardness of waste water.As a result, temporary hardness is reduced to less than 50 milligrams of CaCO
3/ liter, pH is reduced to 9.5-10.5.The waste water that pump 5 will need to handle is pumped to outlet logistics 7 from storage tank 2.Then,, will inject waste water stream 4, and pH will be controlled at 6.5-9, and make full use of flocculation agent to meet technical requirements to the outlet current by the carbonic acid gas of pipeline 6 by being arranged on the sparger on the pipeline.Because carbonic acid gas and Mg
+ 2And Ca
+ 2Cationoid reaction forms Ca (HCO
3)
2And Mg (HCO
3)
2, and Ca (HCO
3)
2And Mg (HCO
3)
2In water, have, so pipeline keeps the state of essentially no obstruction than high resolution.In addition, on the pipeline of the back, position of injecting flocculation agent and flocculation load agent, nozzle is set.
This method proof can realize reducing cost by eliminating the salt acid treatment.Method of the present invention is not because exist HCl and safer yet, reduced simultaneously waste water stream pH and temporary hardness.Seldom form and also will change the throw out that cost is handled by blocking pipe in the downstream.
A quality that key factor is a converter recirculated water to waste water reuse after the dedusting.For utilizing muddy recirculated water again, at first carbonic acid gas is injected thrust-augmenting nozzle by vertical tube, downstream water is sent in the spoke-like pond (spokewise pool) the carbonic acid gas bubble to reduce pH to 9.5-10.5, and temporary hardness is reduced to less than 50 milligrams of CaCO simultaneously
3/ liter.Flocculation and be cooled to about 30 ℃ after, use recirculated water washing converter waste gas, carbonic acid gas in the converter waste gas is partially absorbed in recirculated water.The flow velocity of the inlet stream in the spoke-like pond is a 1000-1300 rice
3/ hour, pH is 11.1-11.3, temporary hardness is about 350 milligrams of CaCO
3/ liter.
By recirculated water is contacted with waste gas, carbonic acid gas can react in recirculated water in the waste gas, to reduce the pH value to 8.5-9.5.In this case, CaO will be dissolved in and form Ca (HCO in the recirculated water in the waste gas
3)
2, to suppress fouling in the injection system.
If carry out in the absence of carbon dioxide treatment of the present invention, need per two weeks chemical injection system to be cleaned.After adopting method of the present invention, the injection system operation just needs cleaning after three months.
Though described the present invention about the specific embodiment of the present invention, obviously, many other forms of the present invention and change it will be apparent to those skilled in the art that.Appending claims of the present invention generally should be interpreted into all these conspicuous form and changes that are included within true spirit of the present invention and the scope.
Claims (18)
1. improved method that reduces the pH of described waste water during chemical treatment waste water, its improvement comprises introduces described waste water with carbonic acid gas.
2. the method for claim 1 is characterized in that, described chemical treatment comprises in described waste water introduces chemical reagent.
3. method as claimed in claim 2 is characterized in that, described chemical reagent is selected from down group: flocculation agent, flocculation load agent, corrosion inhibitor and scale inhibitor.
4. the method for claim 1 is characterized in that, carbonic acid gas is introduced described waste water after described chemical treatment.
5. the method for claim 1 is characterized in that, carbonic acid gas is introduced described waste water before described chemical treatment.
6. the method for claim 1 is characterized in that, before described introducing carbonic acid gas, the pH of waste water is greater than 8.
7. the method for claim 1 is characterized in that, in more than one position carbonic acid gas is introduced described waste water.
8. the method for claim 1 is characterized in that, described introducing carbonic acid gas has reduced the temporary hardness of described waste water.
9. the method for claim 1 is characterized in that, described waste water is from the Iron and Steel Production device.
10. the method for claim 1 is characterized in that, described waste water is selected from down group: converter recirculated water, circulation water of blast furnace and other waste water.
11. the method for claim 1 is characterized in that, by diffusion system described carbonic acid gas is introduced described waste water.
12. the method for claim 1 is characterized in that, described diffusion system is selected from down group: diffusion flexible pipe, the injection device of water-soluble carbonic acid gas, nozzle and vent fan.
13. the method for claim 1 is characterized in that, in more than one position described carbonic acid gas is introduced described Waste Water Treatment.
14. the method for claim 1 is characterized in that, under the situation of one or more additional processing described carbonic acid gas is added described Waste Water Treatment.
15. one kind carbonic acid gas introduced the system of waste water stream, this system comprises storage tank; Evaporation unit; Processing control apparatus and dispersion device.
16. system as claimed in claim 15 is characterized in that, described storage tank contains carbonic acid gas.
17. system as claimed in claim 15 is characterized in that, described evaporation unit also comprises strainer and pressure regulator valve.
18. system as claimed in claim 15 is characterized in that, described dispersion device is selected from down group: diffusion flexible pipe, nozzle and vent fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910132466A CN101844826A (en) | 2009-03-27 | 2009-03-27 | Treatment method of carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910132466A CN101844826A (en) | 2009-03-27 | 2009-03-27 | Treatment method of carbon dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101844826A true CN101844826A (en) | 2010-09-29 |
Family
ID=42769663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910132466A Pending CN101844826A (en) | 2009-03-27 | 2009-03-27 | Treatment method of carbon dioxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101844826A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102432122A (en) * | 2011-11-01 | 2012-05-02 | 中冶建筑研究总院有限公司 | Method for treating circulating water |
| CN103553246A (en) * | 2013-11-21 | 2014-02-05 | 武汉森泰环保工程有限公司 | Device and method for softening hard water by using carbon dioxide in flue gas |
| CN103570144A (en) * | 2012-12-28 | 2014-02-12 | 青岛啤酒股份有限公司 | Method for inhibiting bottle washing machine from scaling by using carbon dioxide discharged by wine filling machine |
| CN105293669A (en) * | 2015-11-12 | 2016-02-03 | 新疆天智辰业化工有限公司 | Method for adjusting pH value of alkaline waste water |
| CN108467135A (en) * | 2018-04-20 | 2018-08-31 | 西安建筑科技大学 | A kind of granulating fluidized bed water treatment system of full-automatic chemical crystallisation cycle |
| EP3129126A4 (en) * | 2014-04-07 | 2018-11-21 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
| CN111807495A (en) * | 2020-08-05 | 2020-10-23 | 西安热工研究院有限公司 | Water quality control device and method for preventing corrosion of indirect air-cooling circulating water system |
| US11660779B2 (en) | 2016-04-11 | 2023-05-30 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
| US11773019B2 (en) | 2013-06-25 | 2023-10-03 | Carboncure Technologies Inc. | Methods and compositions for concrete production |
| US11773031B2 (en) | 2013-06-25 | 2023-10-03 | Carboncure Technologies Inc. | Apparatus for delivery of a predetermined amount of solid and gaseous carbon dioxide |
| US11958212B2 (en) | 2017-06-20 | 2024-04-16 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
-
2009
- 2009-03-27 CN CN200910132466A patent/CN101844826A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102432122A (en) * | 2011-11-01 | 2012-05-02 | 中冶建筑研究总院有限公司 | Method for treating circulating water |
| CN103570144A (en) * | 2012-12-28 | 2014-02-12 | 青岛啤酒股份有限公司 | Method for inhibiting bottle washing machine from scaling by using carbon dioxide discharged by wine filling machine |
| US11773019B2 (en) | 2013-06-25 | 2023-10-03 | Carboncure Technologies Inc. | Methods and compositions for concrete production |
| US11773031B2 (en) | 2013-06-25 | 2023-10-03 | Carboncure Technologies Inc. | Apparatus for delivery of a predetermined amount of solid and gaseous carbon dioxide |
| CN103553246A (en) * | 2013-11-21 | 2014-02-05 | 武汉森泰环保工程有限公司 | Device and method for softening hard water by using carbon dioxide in flue gas |
| EP3129126A4 (en) * | 2014-04-07 | 2018-11-21 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
| US11878948B2 (en) | 2014-04-07 | 2024-01-23 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
| CN105293669A (en) * | 2015-11-12 | 2016-02-03 | 新疆天智辰业化工有限公司 | Method for adjusting pH value of alkaline waste water |
| US11660779B2 (en) | 2016-04-11 | 2023-05-30 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
| US11958212B2 (en) | 2017-06-20 | 2024-04-16 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
| CN108467135A (en) * | 2018-04-20 | 2018-08-31 | 西安建筑科技大学 | A kind of granulating fluidized bed water treatment system of full-automatic chemical crystallisation cycle |
| CN111807495A (en) * | 2020-08-05 | 2020-10-23 | 西安热工研究院有限公司 | Water quality control device and method for preventing corrosion of indirect air-cooling circulating water system |
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Application publication date: 20100929 |