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Device and method for treating industrial wastewater with high salt content

A technology for industrial wastewater and treatment methods, applied in multi-stage water treatment, water/sewage treatment, heating water/sewage treatment, etc. Reach the industrial reuse standard and other issues, and achieve the effect of high recovery rate

Inactive Publication Date: 2017-02-15
INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-salt industrial wastewater has complex components and high salt content. The traditional zero discharge of wastewater is limited by many factors such as the current technical level, equipment investment, operating costs, and operational stability. The various salts contained cannot be effectively separated and crystallized, and the crystalline miscellaneous salts produced cannot meet the industrial recycling standards, and become waste or even toxic substances, which cannot be effectively utilized. Instead, they need to be further processed. to zero emissions in the true sense

Method used

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  • Device and method for treating industrial wastewater with high salt content
  • Device and method for treating industrial wastewater with high salt content
  • Device and method for treating industrial wastewater with high salt content

Examples

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Embodiment 1

[0073] This embodiment is applicable to the case where the TDS content in the high-salt industrial wastewater treated by the pretreatment unit is less than 10,000 mg / L. figure 1 The processing apparatus and flow for this example are shown, as follows:

[0074] (1) Ultrafiltration product water enters a section of reverse osmosis membrane system for concentration treatment. After being treated by a section of reverse osmosis membrane, the reverse osmosis produced water is directly recycled, and the concentrated water enters the ion exchange resin device. At this time, the TDS of the concentrated water can reach 20000~30000mg / L. Through this device, the residual hardness (mainly calcium ions and magnesium ions) in the water is removed, and the hardness in the produced water is basically zero, which effectively avoids the risk of fouling in the subsequent treatment unit and ensures its normal operation.

[0075] (2) The water produced by the ion exchange resin enters the second-...

Embodiment 2

[0084] This embodiment is applicable to the case where the TDS content in the high-salt industrial wastewater treated by the pretreatment unit is 10,000 mg / L~35,000 mg / L. figure 2 The processing apparatus and flow for this example are shown, as follows:

[0085] (1) After homogenization in the adjustment tank, hard removal in the high-density sedimentation tank, and further removal of colloids and turbidity by the submerged ultrafiltration membrane, the product water directly enters the reverse osmosis membrane for concentration treatment (in this example, there is only one stage of reverse osmosis in the whole process ). After being treated by the reverse osmosis membrane, the reverse osmosis product water is directly recycled, and the concentrated water TDS reaches 30,000~60,000mg / L and enters the ion exchange resin device to further remove the residual hardness in the wastewater. The hardness of the product water is basically zero, which greatly reduces the subsequent trea...

Embodiment 3

[0094] This embodiment is applicable to the case where the TDS content in the high brine treated by the pretreatment unit is 35000 mg / L~60000 mg / L, and the attached image 3 The processing apparatus and flow for this example are shown, as follows:

[0095] (1) Since the TDS of the influent water is already high, the produced water after the homogenization of the regulating tank, the removal of hardness in the high-density sedimentation tank, and the further removal of colloid and turbidity by the submerged ultrafiltration membrane can directly enter the nanofiltration system for salt separation. However, considering that the removal of hardness in high-density sedimentation tanks is not very thorough, the total hardness is generally controlled at <100mg / L. Therefore, an ion exchange resin system is installed before entering the nanofiltration membrane system. The ion exchange resin device completely removes the hardness in the product water to ensure the normal operation of th...

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Abstract

The invention provides a method for treating industrial wastewater with a high salt content. The method includes steps of pretreating the industrial wastewater with the high salt content, to be more specific, regulating and homogenizing the industrial wastewater with the high salt content by the aid of a high-salinity water regulating tank, then feeding the industrial wastewater into a high-density sedimentation tank, carrying out chemical softening treatment and flocculation sedimentation on the industrial wastewater, simultaneously removing most silicon dioxide and suspended matters, feeding water treated by the high-density sedimentation tank into an immersed ultra-filtration tank and further removing suspended matters and colloidal impurities in the water; carrying out separation and concentration, to be more specific, concentrating and separating the industrial wastewater with the high salt content after the industrial wastewater is pretreated at the pretreatment step, or carrying out ion exchange treatment on the industrial wastewater; recycling crystals, and to be more specific, separating the sodium chloride crystals and the sodium sulfate crystals from the water by the aid of crystallizers. The invention further provides a device for treating the industrial wastewater with the high salt content.

Description

technical field [0001] The invention relates to a wastewater treatment device and method, in particular to a treatment device and method for high-salt industrial wastewater. Background technique [0002] In the production process of coal chemical industry, petrochemical industry and other industries, a large amount of washing wastewater, condensate of process system, drainage of chemical water station, sewage of circulating water, etc. will be generated, which has the characteristics of large water consumption, large amount of wastewater, complex composition and high concentration of pollutants , high hardness, high salt content and large fluctuations in water quality. The present invention is aimed at the treatment of such high-salt industrial wastewater. [0003] At present, high-salt industrial wastewater can meet the reuse requirements after pretreatment, biochemical treatment and reuse water treatment, but the overall water recovery rate of the system is only 80%. Dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCY02A20/131C02F9/00C02F1/04C02F1/42C02F1/441C02F1/442C02F1/444C02F2001/007C02F2301/08
Inventor 赛世杰张娜党平高贵和刘慧李战胜王俊辉薛源刘丹茹李思序杭天浜郭默然
Owner INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH
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