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Polyvinyl chloride centrifugal mother liquor wastewater pretreatment method

A polyvinyl chloride, centrifugal mother liquor technology, applied in water/sewage multi-stage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. The effect of improved biodegradability

Inactive Publication Date: 2015-11-11
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the defects in the existing methods for treating PVC centrifuge mother liquor, solve the problem of macromolecular substance blocking film, improve the treatment effect and reduce the treatment cost, the present invention provides a coagulation sedimentation-quartz sand filtration-ozone oxidation combined technology treatment The method of centrifuging PVC mother liquor, the method is simple in process, low in energy consumption, remarkable in effect, low in cost and has no secondary pollution

Method used

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Examples

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Effect test

Embodiment 1

[0023] The PVC centrifugal mother liquor discharged from the PVC polymerization section of a chlor-alkali enterprise in Northeast China was used for experiments. The initial COD of the waste water was 101mg / L, the PVA was 3mg / L, and the turbidity was 89FAU. COD was measured by American Hach COD digestion instrument (DRB200, American Hach) and portable spectrophotometer (DR2800, American Hach), PVA was measured by boric acid-potassium iodide spectrophotometry (DR2800, American Hach), BOD 5 The American Hach BOD rapid tester (BODTrack II, American Hach) was used for measurement, and the turbidity was measured by a portable water quality monitor (DR820DR850, American Hach).

[0024] Sieve out the quartz sand with a particle size between 0.8mm and 1.0mm, wash and dry it with tap water, and put it into a glass column. The diameter of the filter column is 5cm, and the height of the quartz sand is 20cm. Add 0.1g of Al to 1L of wastewater 2 (SO 4 ) 3 18H 2 O and 0.004g of PAM, adj...

Embodiment 2

[0026]Experiments were carried out by using a PVA solution prepared by dissolving PVA particles with a molecular weight of 1750±50 in distilled water and mixing the mother liquor wastewater collected from the PVC polymerization section of the chlor-alkali enterprise. The initial COD of the wastewater is 133mg / L, the PVA is 29mg / L, and the turbidity is 75FAU. After processing according to the combination technology described in Example 1, the PVA concentration is about 0.5mg / L, the removal rate is close to 100%, the removal rate of COD can reach 56%, and the removal rate of BOD 5 / COD increased from 0.13 to 0.41, and the turbidity after treatment was 0.

Embodiment 3

[0028] Experiments were carried out by using a PVA solution prepared by dissolving PVA particles with a molecular weight of 1750±50 in distilled water and mixing the mother liquor wastewater collected from the PVC polymerization section of the chlor-alkali enterprise. The initial COD of the wastewater is 396mg / L, the PVA is 50mg / L, and the turbidity is 45FAU. According to the combination technology described in Example 1, the PVA concentration after treatment is about 8mg / L, and the removal rate is about 84%, while the removal rate of COD can reach 79%, and the turbidity after treatment is reduced to 0, BOD 5 / COD increased from 0.007 to 0.26.

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Abstract

The invention provides a polyvinyl chloride centrifugal mother liquor wastewater pretreatment method, and belongs to the technical field of wastewater treatment. The method adopts a flocculation deposition-quartz sand filtration-ozone oxidation combination mode to treat PVA in PVC centrifugal mother liquor wastewater. Te method comprises the following steps: adding a coagulant and a coagulant aid to the mother liquor wastewater to carry out flocculation deposition, filtering by using a quartz sand filtering column, carrying out ozone aeration treatment on the obtained filtrate, and allowing treated wastewater to directly enter a routine biological treatment system. The method has the advantages of substantial effect, low cost and simple operation, allows disadvantages of other treatment units to be made up through combining all treatment units, and can be widely used in pretreatment of the PVC centrifugal mother liquor wastewater.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a cheap pretreatment method for removing PVA in centrifugal mother liquor waste water produced in a polyvinyl chloride (PVC) production process and reducing waste water chemical oxygen demand (COD) and turbidity. technical background [0002] PVC centrifuge mother liquor wastewater mainly comes from the PVC polymerization section in the chlor-alkali industry, and is one of the main wastewater generated during the production of PVC from vinyl chloride. The main pollutant PVA (polyvinyl alcohol) has water activity and will form a large number of foams, which will affect the reoxygenation of water and inhibit the respiration of aquatic organisms. [0003] At this stage, most PVC production enterprises have built secondary biological treatment equipment and membrane treatment equipment to process PVC centrifugal mother liquor, aiming to reuse the treated mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/78
Inventor 花修艺葛睿孙文田曹珍闫征楚朱磊
Owner JILIN UNIV
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