A zero-discharge method for high-salt wastewater

A high-salt wastewater, zero-discharge technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Realize the effect of resource disposal and reduce energy consumption

Active Publication Date: 2018-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both of the above two patents are aimed at high-salt wastewater with high hardness, and use alkali-added microfiltration to remove hardness as pretreatment, but no treatment method is given for the concentrated water problem of membrane distillation, which brings new problems to the ecological environment. troubled

Method used

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  • A zero-discharge method for high-salt wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The main water quality characteristics of high-salt wastewater are: wastewater pH7, conductivity 10000μs / cm, COD cr 0 mg / L, Na + 2000mg / L, Cl - 2500mg / L, total hardness (CaCO 3 ) 200mg / L, alkalinity (as CaCO 3 Total) 100mg / L, dissolved silicon 0mg / L.

[0075] Such as figure 1 As shown, the treatment process of this high-salt wastewater is as follows:

[0076] (1) Resin adsorption. First, enter the high-salt wastewater into the resin adsorption unit for resin adsorption treatment, remove hardness and a small amount of organic matter in the high-salt wastewater, and obtain effluent after resin adsorption;

[0077] Wherein, the resin adopts a first-grade weakly acidic cation exchange resin, and the operating flow rate of the resin adsorption unit is 4BV / h; under this operating condition, the hardness of the water produced by resin adsorption is less than 10mg / L; after the resin is saturated, 5% hydrochloric acid is used Perform elution and regeneration, the regenera...

Embodiment 2

[0087] The main water quality characteristics of high-salt wastewater are: wastewater pH7.5, conductivity 15000μs / cm, COD cr 50mg / L, Na + 3000mg / L, Cl - 3500mg / L, total hardness (CaCO 3)500mg / L, alkalinity (as CaCO 3 Total) 150mg / L, dissolved silicon 20mg / L.

[0088] Such as figure 1 As shown, the treatment process of this high-salt wastewater is as follows:

[0089] (1) Resin adsorption. First, enter the high-salt wastewater into the resin adsorption unit for resin adsorption treatment, remove hardness and a small amount of organic matter in the high-salt wastewater, and obtain effluent after resin adsorption;

[0090] Wherein, the resin adopts a first-grade weakly acidic cation exchange resin, and the operating flow rate of the resin adsorption unit is 6BV / h; under this operating condition, the hardness of the water produced by resin adsorption is less than 10mg / L; after the resin is saturated, 7% hydrochloric acid is used Perform elution and regeneration, the regener...

Embodiment 3

[0100] The main water quality characteristics of high-salt wastewater are: wastewater pH8, conductivity 20000μs / cm, COD cr 100mg / L, Na + 4000mg / L, Cl - 5000mg / L, total hardness (CaCO 3 ) 1000mg / L, alkalinity (as CaCO 3 Total) 300mg / L, dissolved silicon 50mg / L.

[0101] Such as figure 1 As shown, the treatment process of this high-salt wastewater is as follows:

[0102] (1) Resin adsorption. First, enter the high-salt wastewater into the resin adsorption unit for resin adsorption treatment, remove hardness and a small amount of organic matter in the high-salt wastewater, and obtain effluent after resin adsorption;

[0103] Wherein, the resin adopts two-stage weakly acidic cation exchange resins, and the resin adsorption water after the first-stage resin adsorption is about to enter the second-stage resin adsorption, and the operating flow rate of the resin adsorption unit is 8BV / h; under these operating conditions, the resin adsorption The hardness of the produced water ...

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Abstract

The invention relates to the field of industrial wastewater treatment, in particular to a high-salinity wastewater zero-discharging method. According to the method, a 'resin adsorption + efficient reverse osmosis + membrane distillation + evaporative crystallization' method is adopted to treat high-salinity wastewater. Firstly, resin adsorption is adopted to remove hardness and a little amount of organic matter in the high-salinity wastewater, then efficient reverse osmosis is adopted to further concentrate the high-salinity wastewater without hardness so as to obtain efficient reverse osmosis producing water and efficient reverse osmosis concentrated water, deep concentration is conducted on the efficient reverse osmosis concentrated water through membrane distillation to obtain membrane-distillation producing water and membrane-distillation concentrated water, evaporative crystallization treatment is further conducted on the membrane-distillation concentrated water to enable salt solids in the concentrated water to crystallize out, and centralized drying disposal is performed. The efficient reverse osmosis producing water, the membrane-distillation producing water and evaporative-crystallization producing water produced in the treating process can be reused for a production process, water resources are recycled to the most degree while the problem of wastewater discharging is solved, and zero discharging of high-salinity wastewater is basically achieved.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a zero-discharge method for high-salt wastewater. In particular, it refers to a zero-discharge method for treating high-salt wastewater by using membrane separation technology, more specifically, it involves a zero-discharge method for treating high-salt wastewater by "resin adsorption + high-efficiency reverse osmosis + membrane distillation + evaporation crystallization". Background technique [0002] In recent years, with the widespread application of membrane sewage treatment and reuse devices, the high-salt wastewater produced by petrochemical enterprises, especially the reverse osmosis concentrated water, has become a difficult problem to deal with. This high-salt wastewater can neither be discharged nor reused, which has brought great Come to great trouble. Therefore, it is urgent to seek new separation technologies to solve the problem of treatment and disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
Inventor 张新妙平春霞彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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