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Method for treating wastewater

A technology for treating waste water and waste water, applied in water softening, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of serious membrane pollution, increase the load of evaporation treatment, etc., simplify the operation steps and increase the concentration multiple , the effect of reducing pollution

Inactive Publication Date: 2013-02-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high hardness of the wastewater, with the increase of the concentration ratio, the membrane fouling generated in the vacuum membrane distillation process is more serious; and due to the membrane fouling, the concentration ratio of the wastewater is limited, which increases the load of subsequent evaporation treatment

Method used

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Examples

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Embodiment 1

[0027] The lye incineration waste water (its composition is shown in Table 1) in the ethylene production is discharged in the hard reaction pool 1, and according to the Mg in the waste water 2+ Concentration and Ca 2+ Concentration added NaOH and Na 2 CO 3 , where the amount of NaOH added is Mg 2+ 2 times the amount, Na 2 CO 3 The amount added is Ca 2+ 1 times the amount to precipitate Mg in wastewater 2+ and Ca 2+, while making the pH of the wastewater reach 9. After reacting in the hard removal reaction tank 1 for 30 minutes, the waste water is discharged into the filter 2 for filtration. The inlet filter used here is a ceramic membrane filter with a membrane pore size of 0.1 μm, and the SS concentration of the microfiltration water is 0.5 mg / L, the turbidity is 0.1NTU, its specific composition is shown in Table 2, and the slurry 13 with a solid content of 3% is discharged at the same time. Next, the wastewater is discharged into the vacuum membrane distillation dev...

Embodiment 2

[0033] Discharge the secondary reverse osmosis concentrated wastewater (see Table 3 for its composition) from the refinery sewage reuse unit into the hardening reaction tank 1, and according to the Mg in the wastewater 2+ Concentration and Ca 2+ Concentration added NaOH and Na 2 CO 3 , where the amount of NaOH added is Mg 2+ 2 times the amount, Na 2 CO 3 The amount added is Ca 2+ 1 times the amount to precipitate Mg in wastewater 2+ and Ca 2+ , while making the pH of the wastewater reach 9. After reacting in the hard removal reaction tank 1 for 30 minutes, the waste water is discharged into the filter 2 for filtration. The microfiltration membrane filter used here is a ceramic membrane filter with a membrane pore size of 0.1 μm, and the SS concentration of the microfiltration water The turbidity is 0.3mg / L, the turbidity is 0.1NTU, its specific composition is shown in Table 4, and the slurry 13 with a solid content of 3% is discharged at the same time. Next, the waste...

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Abstract

The invention relates to a method for treating wastewater, and belongs to the field of wastewater treatment. The method comprises a first step of discharging the wastewater to a hardness-removing reaction tank, adding a hardness-removing agent to remove Mg<2+> and Ca<2+> from the wastewater; a second step of discharging the wastewater treated by the first step into a filter for filtration, and removing suspended solid substances; and a third step of discharging the wastewater treated by the second step into a vacuum membrane distillation device to directly perform vacuum membrane distillation, and separating other salts in the wastewater. With the method provided by the invention, the wastewater with high hardness and high salinity, particularly the alkali incineration wastewater produced in ethylene production, can be treated effectively. The method has the advantages of low wastewater discharging amount, high water yield, good water quality, etc.

Description

technical field [0001] The invention relates to a method for treating waste water, more particularly to a method for treating high-salt, high-hardness waste water, such as alkali liquor incineration waste water produced in ethylene production. Background technique [0002] With the development of economy and the increasingly tense water resources, the status of water in industrial production is becoming more and more important. The petrochemical industry is a high-water-consuming industry. It discharges a large amount of industrial sewage every year, especially in the production of ethylene, which discharges a large amount of lye incineration wastewater. Due to its physical properties and components, there has been no effective treatment method. [0003] At present, the main treatment method of lye incineration wastewater generated in ethylene production is to discharge it to the sewage field for biochemical treatment together with other wastewater generated in the ethylene ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F5/02C02F1/44
Inventor 赵鹏张新妙杨永强彭海珠王玉杰
Owner CHINA PETROLEUM & CHEM CORP
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