CN101462813B - Method for treating wastewater from polychloroethylene production - Google Patents

Method for treating wastewater from polychloroethylene production Download PDF

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Publication number
CN101462813B
CN101462813B CN2009100137130A CN200910013713A CN101462813B CN 101462813 B CN101462813 B CN 101462813B CN 2009100137130 A CN2009100137130 A CN 2009100137130A CN 200910013713 A CN200910013713 A CN 200910013713A CN 101462813 B CN101462813 B CN 101462813B
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wastewater
waste water
time
treatment
supernatant liquor
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CN2009100137130A
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CN101462813A (en
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王德祥
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Xinwen Mining Group Co Ltd Taishan Salt & Chemical Branch
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Xinwen Mining Group Co Ltd Taishan Salt & Chemical Branch
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    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Removal Of Specific Substances (AREA)

Abstract

The invention discloses a wastewater treatment method during the production of polyvinyl chloride. The method mainly comprises the following steps: removing the sulfides having the inhibiting action on microorganisms in the wastewater through green vitriol and acid; further removing acetylene residue through compressed air; then mixing with organic wastewater coming from a production workshop, adding hydrolysis acidification bacteria for hydrolysis acidification and converting the hardly degradable macromolecular organisms in the wastewater into easily degradable micromolecular organisms; andfinally further carrying out the biological aerobic treatment of the hydrolyzed and acidified wastewater, removing the soluble organisms in the wastewater through the metabolism of aerobes so as to reach the aim of removing COD. The method has the advantages that: as the calcium carbide wastewater is firstly subjected to the preliminary physical and chemical treatment and then subjected to the biochemical treatment together with the organic wastewater, the method has a simple process and little floor space, is suitable for in-plant direct treatment and reaches the emission effect standard.

Description

Wastewater treatment method in the Production of PVC
Technical field
The present invention relates to processing method of industrial waste water, especially the treatment process of waste water of PVC production.
Background technology
Polyvinyl chloride generally adopts calcium carbide route production at home at present.Though this method is polluted less but still inevitably discharged a certain amount of is the acetylene sludge wastewater of main component with calcium hydroxide,, be the difficult point that the three wastes are handled because of big, the COD high (reaching 800mg/L) of such waste water alkalescence.The also not direct at present simple and easy effective way of in factory, handling.
In Production of PVC, also produce the organic waste water of a great deal of in addition, contain the auxiliary agent and the vinyl chloride monomer of large amount of organic in this class waste water.Through microorganism culturing test, can produce the bacterial strain of handling such waste water, therefore can utilize biological action to reduce COD in the waste water.
Summary of the invention
The present invention takes all factors into consideration the characteristics of calcium carbide waste water and organic waste water in the Production of PVC, proposes a kind of simple and easy method that this two classes waste water is carried out biochemical treatment together.
For achieving the above object, the present invention takes following treatment process:
The first step: acetylene sludge wastewater is quiet heavy in water collecting basin, most of calcium hydroxide is precipitated out, obtain containing Ca (OH) 2, S 2-, micro-SS, CL -, NaClO -The supernatant liquor first time with phosphide etc.
Second step: with above-mentioned first time supernatant liquor send cooling tower to be cooled to about 30 ℃, add green vitriol and react, generate FeS and Fe (OH) 2, adding hydrochloric acid adjusting pH value simultaneously is about 7, removing waste water has inhibiting sulfide to obtain supernatant liquor for the second time to microorganism.
The 3rd step: be blown into pressurized air in the second time in the supernatant liquor, utilize the low-boiling characteristics of acetylene that the acetylene of remnants is further removed, airborne oxygen is with Fe (OH) simultaneously 2Oxidation and Fe (OH) 3, FeS is oxidized to Fe 2O 3And elemental sulfur, thereby make in the waste water COD concentration reduce to 300mg/L, no longer contain the material that microorganism is obviously suppressed, send into settling tank.
The 4th step: remove mud through post precipitation and obtain clear liquid for the third time, clear liquid mixes with organic waste water from production plant for the third time, add the acidifying of acidication bacteria for hydrolysis again, the larger molecular organics of the difficult degraded in the waste water is converted into the small organic molecule of easy degraded.
The 5th step: the waste water of acidication is further carried out the aerobe processing, utilize the metabolism of aerobe to remove dissolved organic matter in the waste water, reach and remove the COD purpose, the waste water of biochemical treatment precipitates and obtains clear liquid the 4th time, reaches emission standard.
Positively effect of the present invention is: earlier the preliminary materialization of calcium carbide waste water is handled, carried out biochemical treatment with organic waste water again, technology is simple, and floor space is little, is fit to directly handle in the factory, and reaches row's criterion standard.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Further describe processing step with reference to the accompanying drawings.
As shown in the figure, waste water treatment process process of the present invention is as follows:
1, acetylene sludge wastewater is carried out quiet sinking in water collecting basin, most of calcium hydroxide is precipitated out, obtain containing Ca (OH) 2, S 2-, micro-SS, CL -, NaClO -, phosphide etc. the supernatant liquor first time.
2, cooling tower is advanced in the above-mentioned supernatant liquid cooling first time and be cooled to about 30 ℃, send into equalizing tank precipitation and pumping and squeeze into and add green vitriol in the tube mixer and react, generate FeS and Fe (OH) 2, adding hydrochloric acid adjusting pH value simultaneously is about 7, removing waste water has inhibiting sulfide to obtain supernatant liquor for the second time to microorganism.
3, supernatant liquor enters the stripping pond for the second time, is blown into pressurized air, utilizes the low-boiling characteristics of acetylene that the acetylene of remnants is further removed, and airborne oxygen is with Fe (OH) simultaneously 2Be oxidized to Fe (OH) 3, FeS is oxidized to Fe 2O 3And elemental sulfur, thereby make in the waste water COD concentration reduce to 300mg/L, no longer contain the material that microorganism is obviously suppressed, send into settling tank.
4, remove mud through post precipitation and obtain the 3rd clear liquid, send into hydrolysis acidification pool, and mix with organic waste water from production plant, add the acidifying of acidication bacteria for hydrolysis again, the larger molecular organics of the difficult degraded in the waste water is converted into the small organic molecule of easy degraded, and post precipitation waste water enters the catalytic oxidation chamber.
5, the waste water behind the acidication further carries out the aerobe processing in the catalytic oxidation chamber, utilize the metabolism of aerobe to remove dissolved organic matter in the waste water, reach and remove the COD purpose, the waste water of biochemical treatment precipitates and obtains clear liquid the 4th time, reaches emission standard.
Through three sedimentary mud, enter sludge sump and concentrate, and compress concentration.

Claims (1)

1. wastewater treatment method in the Production of PVC is characterized in that treatment step is as follows:
The first step: acetylene sludge wastewater is quiet heavy in water collecting basin, most of calcium hydroxide is precipitated out, obtain containing Ca (OH) 2, S 2-, micro-SS, CL -, NaClO -The supernatant liquor first time with phosphide;
Second step: with above-mentioned first time supernatant liquor send cooling tower to be cooled to about 30 ℃, add green vitriol and react, generate FeS and Fe (OH) 2, adding hydrochloric acid adjusting pH value simultaneously is about 7, removing waste water has inhibiting sulfide to obtain supernatant liquor for the second time to microorganism;
The 3rd step: be blown into pressurized air in the second time in the supernatant liquor, utilize the low-boiling characteristics of acetylene that the acetylene of remnants is further removed, airborne oxygen is with Fe (OH) simultaneously 2Oxidation and Fe (OH) 3, FeS is oxidized to Fe 2O 3And elemental sulfur, thereby make in the waste water COD concentration reduce to 300mg/L, no longer contain the material that microorganism is obviously suppressed, send into settling tank;
The 4th step: remove mud through post precipitation and obtain clear liquid for the third time, clear liquid mixes with organic waste water from production plant for the third time, add the acidifying of acidication bacteria for hydrolysis again, the larger molecular organics of the difficult degraded in the waste water is converted into the small organic molecule of easy degraded;
The 5th step: the waste water of acidication is further carried out the aerobe processing, utilize the metabolism of aerobe to remove dissolved organic matter in the waste water, reach and remove the COD purpose, the waste water of biochemical treatment precipitates and obtains clear liquid the 4th time, reaches emission standard.
CN2009100137130A 2009-01-05 2009-01-05 Method for treating wastewater from polychloroethylene production Expired - Fee Related CN101462813B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009100137130A CN101462813B (en) 2009-01-05 2009-01-05 Method for treating wastewater from polychloroethylene production

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Application Number Priority Date Filing Date Title
CN2009100137130A CN101462813B (en) 2009-01-05 2009-01-05 Method for treating wastewater from polychloroethylene production

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CN101462813A CN101462813A (en) 2009-06-24
CN101462813B true CN101462813B (en) 2011-03-23

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104445278B (en) * 2014-11-07 2016-06-29 昊华宇航化工有限责任公司 The peace and quiet thin stillage recycling of generated by polyvinyl chloride by calcium carbide is to the technique of Caustic soda primary brine
CN104445724B (en) * 2014-11-20 2016-08-24 新疆中泰化学股份有限公司 High chlorine root wastewater recycling device and using method thereof in generated by polyvinyl chloride by calcium carbide production

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