CN102086055B - Method for removing sulfide from wastewater - Google Patents
Method for removing sulfide from wastewater Download PDFInfo
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- CN102086055B CN102086055B CN 200910216536 CN200910216536A CN102086055B CN 102086055 B CN102086055 B CN 102086055B CN 200910216536 CN200910216536 CN 200910216536 CN 200910216536 A CN200910216536 A CN 200910216536A CN 102086055 B CN102086055 B CN 102086055B
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Abstract
The invention belongs to the technical field of water treatment, and relates to a method for removing sulfide from wastewater. In the method, a wastewater treatment container which is provided with a wastewater inlet and a wastewater outlet is arranged, wherein the top of the container is closed and provided with an air outlet; a dissolved air releaser is arranged below the liquid level in the container; an air dissolving device is arranged outside the container, and air is dissolved in the wastewater under high pressure; the wastewater which is needed to be treated passes through the container, and all of or part of the wastewater passes through the air dissolving device, so that a large amount of air is dissolved in the wastewater under the high pressure to form dissolved air water; and a large amount of oxygen dissolved in the dissolved air water reacts with the sulfide under the high pressure to oxidize the sulfide, the dissolved air water enters the container through the dissolved air releaser, pressure is suddenly reduced, the air dissolved in the dissolved air water and the sulfide in the form of hydrogen sulfide in the wastewater are separated out simultaneously to form small bubbles to be separated from the wastewater, and the residual sulfide is removed from the wastewater, so that the sulfide is removed from the wastewater. The process is simple, convenient to operate and stably operated.
Description
Technical field
The invention belongs to water-treatment technology field, relate to a kind of method of removing sulfides from wastewater.
Background technology
In the trade effluent that the industries such as dyestuff, medicine, agricultural chemicals and petrochemical complex are discharged, usually contain a large amount of sulfide.When the discharge of wastewater of sulfur compound after water body, can with water body in the ferrous metal ionic reaction, generate precipitation, make the water body blackout smelly; When being acid, easily be converted into the larger hydrogen sulfide of toxicity when wastewater pH, biology is had very large toxicity, therefore, must process sulphide-containing waste water, can discharge after reaching discharging standards.
The removal method of sulfide mainly comprises at present: air lift or blow-off method, coagulant sedimentation, chemical oxidization method and biological oxidation process.Air lift or blow-off method for the treatment of sulphide-containing waste water, are to utilize water vapour or air that the hydrogen sulfide in waste water is separated, and its clearance is higher, and treatment process is ripe, but energy consumption and facility investment are large, and the exhausted air quantity of generation is large, cause the off gas treatment investment large.Coagulant sedimentation utilizes some metal ion to generate the precipitate and separate removal as precipitation agent and sulfonium ion, then the throw out high temperature sintering is reclaimed precipitation agent, and its investment is little, simple to operate, but has precipitate and separate difficulty, the problem that processing costs is high.Chemical oxidization method is commonly used atmospheric oxidation, wet oxidation, supercritical water oxidation and other oxygenant oxidation style etc., to utilize air or other oxygenant that the sulfonium ion in waste water is oxidized to elemental sulfur or vitriol, usually need to add catalyzer or oxygenant, or carry out oxidation under High Temperature High Pressure, there is severe reaction conditions, higher to equipment requirements, the problems such as working cost height.Biological oxidation process is to utilize microorganism to be oxidation of the sulfide into elemental sulfur or vitriol, exists elemental sulfur not easily separated, and microorganism culturing is controlled difficulty, can not process the problems such as high density sulfides waste water.
Summary of the invention
To the objective of the invention is in order addressing the above problem, to propose that a kind of processing efficiency is high, investment and working cost is low, stable, produce the method that the little molten gas of exhausted air quantity is removed sulfides from wastewater.
Technical solution of the present invention:
A kind of molten gas is removed the method for sulfides from wastewater, it is characterized in that its employing following steps:
1. a wastewater treatment container first is set, and this container is provided with waste water import and outlet, and the container top sealing has production well, is used for waste gas is discharged and caused emission-control equipment; In container, liquid level has molten gas release head; Container is provided with air-dissolving apparatus outward, adopts high pressure that air is dissolved in waste water;
2. the waste water with required processing passes through from said vesse, and its hydraulic detention time is not less than 15min; Waste water is all or part of under high pressure dissolves in waste water air by air-dissolving apparatus in a large number, forms dissolved air water;
3. under high pressure, a large amount of oxygen that dissolve in dissolved air water and sulfide reaction with the sulfide oxidation, are removed most of sulfide; Dissolved air water enters container by dissolved air release, pressure reduces suddenly, and the sulfide that is dissolved in hydrogen sulfide form in gas in dissolved air water and waste water is separated out simultaneously, forms micro-bubble and breaks away from waste water, sulfide remaining in waste water is removed, thereby completed the removal of sulfides from wastewater.
The present invention has proposed to utilize molten gas mode to remove the method for the sulfide in waste water first.Present method adopts under high pressure air to be dissolved in and forms dissolved air water in waste water, be dissolved in a large number the oxygen sulfide oxidation under normal temperature high voltage in waste water, after dissolved air water enters container by dissolved air release, pressure reduces suddenly, the sulfide that is dissolved in hydrogen sulfide form in gas in dissolved air water and waste water is separated out simultaneously, form micro-bubble and break away from waste water, sulfide remaining in waste water is removed, thereby completing the removal of sulfides from wastewater.In the present invention, utilize pressure that air is soluble in water, under condition of high voltage, air carries out oxidation to sulfide under dissolved state, and under low pressure, air and hydrogen sulfide are separated out simultaneously and are formed micro-bubble and break away from waste water, the sulfide all can remove waste water in the dissolving of air and precipitation process in.The present invention has solved in present sulfide removal technique preferably, and oxidation style needs catalyzer or carry out the existing severe reaction conditions of oxidation under High Temperature High Pressure, and is high to equipment requirements, the problems such as working cost height; The problems such as the energy consumption that has also solved the existence of air lift or blow-off method is large, exhausted air quantity that produce is large.The present invention has advantages of reaction conditions gentleness, efficient low-consume, exhausted air quantity is little, cost is low; Only need to carry out oxidizing reaction under the pressure, normal temperature condition of about 0.4MPa, far below required 175-350 ℃ of wet oxidation process, the reaction conditions of 2-20MPa; Gas-water ratio only 0.05: 1～10: 1, far below blow-off method or the air oxidation process gas-water ratio of 30: 1～10000: 1, the exhausted air quantity that therefore produces significantly reduces, and is very favourable to the subsequent disposal of waste gas.Molten gas technology involved in the present invention and equipment are ripe, be usually used in the suspended substance in air-float technology (instant gas air supporting) removal waste water in wastewater treatment, technique is simple, easy to operate, stable, therefore has larger promotional value, and application prospect is very wide.
The present invention can be used for containing the wastewater treatment of high density sulfides, as high sulfur-bearing refinery water etc.
Embodiment
The method steps that molten gas of the present invention is removed sulfides from wastewater is as follows:
1. a wastewater treatment container first is set, and this container is provided with waste water import and outlet, and the container top sealing has production well, is used for waste gas is discharged and caused emission-control equipment; In container, liquid level has molten gas release head;
2. container is provided with air-dissolving apparatus outward, adopts high pressure that air is dissolved in waste water; Air-dissolving apparatus can be comprised of air compressor machine, water pump and dissolving, also can adopt gas-liquid mixing pump; Molten gas gas used is generally air, and waste water can adopt all or part of water inlet, also can adopt the waste water that refluxes after processing;
3. the waste water with required processing passes through from said vesse, and its hydraulic detention time is not less than 15min; The dissolved air water that air-dissolving apparatus produces under stress, the air of dissolving carries out oxidation to the sulfide in waste water, after entering container by dissolved air release, pressure reduces suddenly, being dissolved in air in dissolved air water and the sulfide of the hydrogen sulfide form in waste water separates out simultaneously, form micro-bubble and break away from waste water, thereby the sulfide in waste water is removed.
Embodiment 1:
Refinery water for high sulfur-bearing, the air-dissolving apparatus that employing is comprised of air compressor machine, water pump and dissolving, dissolving operating pressure 0.4MPa, return of waste water is than 100%, in the situation for the treatment of time 4h, the water inlet sulfide concentration 200mg/L before processing, water outlet sulfide concentration 15mg/L after processing, sulfide clearance 92.5%, gas-water ratio 0.1: 1.
Embodiment 2:
For high sulfur-bearing wastewater from chemical industry, the employing gas-liquid mixing pump is air-dissolving apparatus, gas-liquid mixing pump operating pressure 0.35MPa, return of waste water is than 500%, in the situation for the treatment of time 6h, the water inlet sulfide concentration 500mg/L before processing, the water outlet sulfide concentration after processing is lower than 20mg/L, sulfide clearance 94%, gas-water ratio 0.5: 1.
Claims (3)
1. method of removing sulfides from wastewater is characterized in that its adopts following steps:
A., a wastewater treatment container first is set, and this container is provided with waste water import and outlet, and the container top sealing has production well, is used for waste gas is discharged and caused emission-control equipment; In container, liquid level has dissolved air release; Container is provided with air-dissolving apparatus outward, adopts high pressure that air is dissolved in waste water;
B. the waste water with required processing passes through from said vesse, and its hydraulic detention time is not less than 15min; Waste water is all or part of under high pressure dissolves in waste water air by air-dissolving apparatus in a large number, forms dissolved air water;
C. under high pressure, a large amount of oxygen that dissolve in dissolved air water and sulfide reaction with the sulfide oxidation, are removed most of sulfide; Dissolved air water enters container by dissolved air release, pressure reduces suddenly, and the sulfide that is dissolved in hydrogen sulfide form in gas in dissolved air water and waste water is separated out simultaneously, forms micro-bubble and breaks away from waste water, sulfide remaining in waste water is removed, thereby completed the removal of sulfides from wastewater.
2. the method for removal sulfides from wastewater according to claim 1 is characterized in that container is furnished with one or more sets air-dissolving apparatus outward; Air-dissolving apparatus is comprised of air compressor machine and water pump and dissolving, perhaps adopts gas-liquid mixing pump.
3. the method for removal sulfides from wastewater according to claim 1, is characterized in that in described processing vessel, liquid level is arranged with one or more dissolved air releases.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910216536 CN102086055B (en) | 2009-12-03 | 2009-12-03 | Method for removing sulfide from wastewater |
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| CN 200910216536 CN102086055B (en) | 2009-12-03 | 2009-12-03 | Method for removing sulfide from wastewater |
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| CN102086055A CN102086055A (en) | 2011-06-08 |
| CN102086055B true CN102086055B (en) | 2013-06-26 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583617B (en) * | 2012-03-19 | 2014-02-26 | 南京中衡元环保设备有限公司 | Isolation type multiphase balanced air floatation device |
| CN104498118A (en) * | 2014-11-17 | 2015-04-08 | 贵州大学 | Deoxidizer of low-concentration oxygen-containing coal bed gas, preparation method and application thereof |
| CN106256782A (en) * | 2015-06-18 | 2016-12-28 | 中国石油化工股份有限公司 | A kind of processing method of oil gas field wastewater with high concentration of sulfide |
| CN107151049A (en) * | 2017-07-05 | 2017-09-12 | 南京乐翼环境科技有限公司 | A kind of oxygen-enriched biological oxidation system |
| CN107913648B (en) * | 2017-10-27 | 2023-09-01 | 中国石油化工股份有限公司 | High-pressure pipeline gas-liquid reactor for treating hydrogen sulfide of oil well and treatment method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1196031A (en) * | 1995-09-15 | 1998-10-14 | 斯托克工程师和承包人公司 | Method and apparatus for degassing sulfur |
| CN1915802A (en) * | 2005-08-19 | 2007-02-21 | 中国石油集团工程设计有限责任公司 | Deaeration technique through oxidation process of mixing fluid and sulfur in sulfur recovery unit |
| CN101343044A (en) * | 2008-08-21 | 2009-01-14 | 中国石油集团工程设计有限责任公司 | Improved liquid sulphur degasification technique |
-
2009
- 2009-12-03 CN CN 200910216536 patent/CN102086055B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1196031A (en) * | 1995-09-15 | 1998-10-14 | 斯托克工程师和承包人公司 | Method and apparatus for degassing sulfur |
| CN1915802A (en) * | 2005-08-19 | 2007-02-21 | 中国石油集团工程设计有限责任公司 | Deaeration technique through oxidation process of mixing fluid and sulfur in sulfur recovery unit |
| CN101343044A (en) * | 2008-08-21 | 2009-01-14 | 中国石油集团工程设计有限责任公司 | Improved liquid sulphur degasification technique |
Non-Patent Citations (1)
| Title |
|---|
| 杨旭等.含硫污水处理方法综述.《油气田环境保护》.1994,第4卷(第3期),第59-61页. * |
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