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Deep stage treatment method for industrial wastewater

A technology for industrial wastewater and graded treatment, applied in the direction of water/sewage multi-stage treatment, separation methods, neutralized water/sewage treatment, etc., can solve the problems of low water quality requirements, secondary pollution, poor reverse osmosis, etc. Achieve the effects of low water quality requirements, simple equipment maintenance and long service life

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] 1. The reverse osmosis method is a deep desalination process. The desalination is more thorough and the water quality of the produced water is better. However, the process has strict requirements on the quality of the influent water, and the reverse osmosis membrane is easily polluted, especially when the water quality fluctuates. Stable operation will be affected;
[0014] 2. When the reverse osmosis desalination process treats wastewater, the organic matter in the wastewater can only be concentrated but not degraded on the concentrated water side, resulting in the organic content of the reverse osmosis concentrated water exceeding the discharge standard, resulting in secondary pollution, and the reverse osmosis concentrated water is difficult to treat to emission standards;
[0015] 3. When the electro-adsorption desalination process treats wastewater, it has lower requirements on the quality of the influent water. It has a certain removal effect on organic matter while desalinating, but the quality of the produced water is worse than that of reverse osmosis, which belongs to moderate desalination. At present, its Produced water can only be used as circulating cooling water replenishment

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Embodiment 1

[0093] The technical scheme of the present invention is used to treat chemical sewage discharged up to the standard, and the influent water quality is 3000 μS / cm in electrical conductivity, 30 mg / L in COD, and 900 mg / L in hardness (calculated as calcium carbonate). The alkaline substance added to the initial hardness reduction operation unit is sodium hydroxide, the pH value is controlled at 10.5, the stirring method is blast stirring, and the mixing reaction time is 20 minutes. The sediment removal method is inclined plate sedimentation, and the sedimentation time 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. Preliminary reduction of hardness The water quality of the effluent from the operating unit is 2800 μS / cm in electrical conductivity and 200 mg / L in hardness (calculated as calcium carbonate). The filtration method of the high-efficiency filtr...

Embodiment 2

[0095] The technical scheme of the present invention is used to treat chemical sewage discharged up to the standard, and the influent water quality is 5000 μS / cm in electrical conductivity, 45 mg / L in COD, and 1000 mg / L in hardness (calculated as calcium carbonate). The basic substance added to the initial hardness reduction operation unit is sodium hydroxide, the pH value is controlled to 12.0, the stirring method is blast stirring, the mixing reaction time is 10 minutes, and the generated sediment is removed by natural sedimentation, and the sedimentation time is 6 hours; The acidic substance added in the neutralization reaction is sulfuric acid, the pH value is controlled at 7.0, and the neutralization reaction time is 10 minutes. Preliminary reduction of hardness The water quality of the effluent from the operating unit is 4600 μS / cm in electrical conductivity and 100 mg / L in hardness (calculated as calcium carbonate). The filtration method of the high-efficiency filtratio...

Embodiment 3

[0097] The technical scheme of the present invention is used to treat chemical sewage discharged up to the standard, and the influent water quality is 5000 μS / cm in electrical conductivity, 45 mg / L in COD, and 1000 mg / L in hardness (calculated as calcium carbonate). The alkaline substance added to the initial hardness reduction operation unit is sodium hydroxide, the pH value is controlled to 8.5, the stirring method is mechanical stirring, and the mixing reaction time is 30 minutes. The acidic substance added in the neutralization reaction is sulfuric acid, the pH value is controlled at 7.0, and the neutralization reaction time is 30 minutes. Preliminary reduction of hardness The water quality of the effluent from the operation unit has a conductivity of 4850 μS / cm and a hardness of 500 mg / L (calculated as calcium carbonate). The filtration method of the high-efficiency filtration operation unit is a combination of sand filtration and laminated filtration. Before sand filtrat...

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Abstract

The invention discloses a deep stage treatment method for industrial wastewater. The method comprises the following steps of: 1, primarily reducing hardness, settling, and neutralizing; 2, filtering; 3, performing electro-adsorption to appropriately remove salt; and 4, performing reverse osmosis to deeply remove salt. According to deep stage treatment method for the industrial wastewater, the water quality application range is wide, a process can run stably, salt can be deeply removed by the method, and a small amount of sewage which is produced by a treatment system and meets the standard is discharged, and secondary pollution is avoided; and the treated industrial wastewater can be used as industrial circulating water, industrial circulating cooling water, and boiler water. The problems that a reverse osmosis membrane is easy to pollute, and reverse osmosis concentrated water which does not meet standard is discharged, and the problem of low running stability are solved; all the discharged sewage which is discharged meets the standard; and the produced water has various water qualities, and the recycling range is widened.

Description

technical field [0001] The invention relates to a method for advanced graded treatment of industrial wastewater. It belongs to the multi-stage treatment of wastewater. Background technique [0002] The reuse of wastewater and sewage can not only save precious water resources, but also greatly reduce sewage discharge and protect the natural environment on which human beings live, which is of great significance to human life and sustainable economic development. [0003] 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. [0004] The desalination and reuse process of industrial wastewater is longer than that of urban sewage treatment, and generally adopts the process of secondary biochemical treatment-filtration-activated carbon ads...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F5/02C02F5/06C02F1/66C02F1/52C02F1/50C02F1/469C02F1/44C02F5/08C02F1/70
Inventor 黄斌梁明潘咸峰张广
Owner CHINA PETROLEUM & CHEM CORP
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