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Method of deep desalting and recycling of industrial effluent

An industrial waste water, deep technology, applied in the direction of chemical instruments and methods, general water supply conservation, water/sewage multi-stage treatment, etc., can solve the problems of ion exchange resin incoming water organic matter pollution, high energy consumption, membranes are easily polluted, etc. Achieve the effects of wide range of applicable water quality, high desalination efficiency and stable process operation

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Electrodialysis is easy to scale and occupies a large area. At present, it is mainly used for groundwater treatment, and it has not been reported for sewage treatment and reuse.
[0005] 2. The reverse osmosis membrane has extremely strict requirements on the quality of the influent water. Although the desalination is relatively thorough, the membrane is easily polluted and energy consumption is high
[0006] 3. Ion exchange resins are also susceptible to organic pollution in incoming water
[0007] 4. The electro-adsorption method is used to remove salt, only applicable to water quality whose conductivity is less than 2500μS / cm
When the conductivity is greater than 2500μS / cm, the system will have an obvious scaling tendency, resulting in unstable operation of the system and frequent chemical cleaning. At the same time, the water quality of the effluent is difficult to meet the water quality requirements of circulating water.

Method used

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  • Method of deep desalting and recycling of industrial effluent

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Comparison scheme
Effect test

Embodiment 1

[0058] Adopt the technical scheme of the present invention to process industrial waste water, the influent water quality is electrical conductivity 2800μS / cm, and the hardness of calcium carbonate is 900mg / L; The time range of the mixing reaction is 20 minutes, and the generated sediment is removed by inclined plate sedimentation, and the sedimentation time range is 4 hours. The acidic substance added in the neutralization reaction is sulfuric acid, the pH value is controlled at 6.8, and the neutralization reaction time is 10 minutes. , reduce the hardness unit effluent water quality is conductivity 2600μS / cm, hardness 220mg / L (calculated as calcium carbonate); high-efficiency filtration unit filtration method is sand filter, no flocculant or bactericide is added; the module operation in the electro-adsorption desalination unit The method is two-stage series connection, the voltage of each pair of electrodes is 1.55V, the working time is 35min, and the backwashing time is 35min...

Embodiment 2

[0060] Adopt the technical solution of the present invention to process industrial waste water, the influent water quality is electrical conductivity 4000μS / cm, and the hardness of calcium carbonate is 1100mg / L; The time range of the mixing reaction is 20 minutes, the generated sediment is removed by inclined plate sedimentation, the sedimentation time range is 4 hours, the acidic substance added for the neutralization reaction is sulfuric acid, the pH value is controlled at 6.5, and the neutralization reaction time is 10 minutes , the quality of the effluent water from the hardness reduction unit is 3700μS / cm in electrical conductivity, and the hardness in terms of calcium carbonate is 250mg / L; the filtration method of the high-efficiency filtration unit is sand filtration, and no flocculant or bactericide is added; the module operation mode in the electro-adsorption desalination unit It is two stages in series, the voltage of each pair of electrodes is 1.60V, the working time...

Embodiment 3

[0062] Adopt the technical solution of the present invention to process industrial waste water, the influent water quality is electrical conductivity 3200μS / cm, and the hardness of calcium carbonate is 600mg / L; The time range of the mixing reaction is 20 minutes, and the generated sediment is removed by inclined plate sedimentation, and the sedimentation time range is 4 hours. The acidic substance added in the neutralization reaction is sulfuric acid, the pH value is controlled at 6.6, and the neutralization reaction time is 10 minutes. , the quality of the effluent water from the hardness reduction unit is 3100 μS / cm in electrical conductivity, and the hardness in terms of calcium carbonate is 230 mg / L; the filtration method of the high-efficiency filtration unit is sand filtration, and no flocculant or bactericide is added; the module operation mode in the electro-adsorption desalination unit It is two stages in series, the voltage of each pair of electrodes is 1.55V, the wor...

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Abstract

The invention provides a method of deep desalting and recycling of industrial effluent. The method is characterized in that industrial effluent to be treated is treated with a hardness reducing operating unit, an efficient filtering operating unit and an electro-adsorption desalting operating unit to reach a standard of recycling water. The method comprises specific steps of: a. hardness reduction, precipitation and neutralization; b. efficient filtering; and c. electro-adsorption desalting. The provided method of deep desalting and recycling of industrial effluent requires no equipment of electroosmosis or reverse osmosis membrane, or ion exchange resin, keeps stable operation of the system under a condition of water quality conductivity higher than 2500 muS / cm and does not scale; and an outlet water quality satisfies water quality requirements on recycling water replenishment. Discharge secondary industrial effluent with water quality conductivity lower than 4500 muS / cm can be treated to reach water replenishment requirements of an industrial recycling water system. The method is suitable for chemical effluent, printing and dyeing effluent, spinning effluent and oil refining effluent and has wide water quality scope of application, stable technology operation and high desalting efficiency.

Description

technical field [0001] The invention relates to a method for deep desalination and reuse of industrial wastewater. Multi-stage treatment of water, waste water or sewage. Background technique [0002] The worldwide shortage of water resources has given great importance to the sustainable utilization of water resources and water-saving reuse. Sewage reuse can not only save a lot of fresh water, but also greatly reduce the discharge of sewage. Industrial wastewater is highly polluted. In developed countries, industrial wastewater is generally treated briefly at the production site, and then mixed with domestic sewage in a well-equipped urban sewage treatment system for treatment. Separate reuse is rare in industrial developed countries. The desalination and reuse treatment process of industrial wastewater is longer than that of urban sewage treatment, and generally adopts the process of secondary biochemical treatment-filtration-activated carbon adsorption-reverse osmosis-reus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCY02A20/131
Inventor 黄斌潘咸峰梁明
Owner CHINA PETROLEUM & CHEM CORP
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