Calcium carbide method polyvinyl chloride mercury-containing wastewater treatment and recycling method and application device thereof

A polyvinyl chloride and wastewater treatment technology, applied in natural water treatment, multi-stage water treatment, water/sewage treatment, etc., can solve problems such as increased power consumption, increased tank voltage, and reduced life of ionic membranes. The effect of high degree of engineering, low operating cost and convenient operation

Pending Publication Date: 2022-05-20
北京铭泽源环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, organic pollutants in water will cause the voltage of the cell to increase,

Method used

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  • Calcium carbide method polyvinyl chloride mercury-containing wastewater treatment and recycling method and application device thereof
  • Calcium carbide method polyvinyl chloride mercury-containing wastewater treatment and recycling method and application device thereof
  • Calcium carbide method polyvinyl chloride mercury-containing wastewater treatment and recycling method and application device thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the first aspect of the present invention provides a kind of calcium carbide process polyvinyl chloride mercury-containing wastewater treatment and recycling method, comprising the steps of:

[0046] S1, pretreating the mercury-containing wastewater, removing impurities and sediments in the water, and obtaining the first mixed solution;

[0047] In this embodiment, the calcium carbide process polyvinyl chloride mercury-containing wastewater is selected for wastewater treatment and recycling. First, the mercury-containing wastewater is pretreated, and the impurities and sediments in the water are removed through the grille and the primary sedimentation tank in turn; the raw water is pretreated through the grille and sedimentation to remove impurities and sediments in the water.

[0048] S2, performing acid-base neutralization adjustment on the first mixed solution to adjust the pH to 7.5-9.5 to obtain a second mixed solution;

[0049] Acid-ba...

Embodiment 2

[0074] The second aspect of the present invention provides an application device for implementing the calcium carbide process polyvinyl chloride mercury-containing wastewater treatment and recycling method described above, including:

[0075] Pretreatment equipment, used for pretreatment of mercury-containing wastewater, including grids and primary sedimentation tanks. Mercury-containing wastewater passes through grids and primary sedimentation tanks in sequence to remove impurities and sediments in the water to obtain the first mixed solution and discharge it into the middle and pool;

[0076] The neutralization tank is used to adjust the acid-base neutralization of the first mixed solution, adjust the pH to 7.5-9.5 to obtain the second mixed solution, and discharge it into the reaction tank;

[0077] A reaction tank, in which mercury remover and sodium sulfide are added, is used to react with the second mixed solution to convert mercury ions into solid mercury, and discharge...

Embodiment 3

[0092] On the basis of Embodiment 2, in this embodiment, the micro-nano ozone bubble generator is preferably used as the ozone oxidation device.

[0093] As an optional embodiment of the present application, optionally, the ozone oxidation equipment is a micro-nano ozone bubble generator, and the diameter of the ozone bubbles is 5-50 μm.

[0094] Micro-nano ozone bubble generator, the diameter of ozone bubbles is 5-50 μm, which can increase the contact area between ozone micro-bubbles and water body, prolong the residence time of ozone in water, and further guarantee the oxidation effect.

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Abstract

The invention discloses a calcium carbide method polyvinyl chloride mercury-containing wastewater treatment and recycling method and an application device thereof, and TOC (total organic carbon) in high-salinity wastewater can be removed and degraded in a graded and efficient manner by coupling coagulation, two-stage efficient precipitation, ozone oxidation and activated carbon adsorption processes in mercury-containing wastewater. Sulfate radicals, carbonate radicals and calcium ions are gradually removed through an original matched process of a brine refining treatment unit of a recycling production unit, mercury-containing produced water can be safely recycled to an electrolytic bath, zero emission and resource reutilization of mercury-containing wastewater are achieved, and compared with electrodialysis, evaporation concentration, nanofiltration, ultrafiltration, MVR/multiple-effect evaporation and the like, the mercury-containing wastewater can be recycled, and the mercury-containing wastewater can be recycled. The process is simple, the operation cost is low, the engineering degree is high, and the purposes of energy conservation, emission reduction, resource utilization and environment protection are effectively achieved.

Description

technical field [0001] The application relates to the technical field of wastewater treatment, in particular to a method for treating and reusing mercury-containing wastewater of polyvinyl chloride by calcium carbide method and its application device. Background technique [0002] The chlor-alkali industry occupies an important position in my country's chemical production field, and its products involve all aspects of the national economy and people's daily life. At present, more than 90% of domestic polyvinyl chloride production enterprises still mainly use calcium carbide method. High-salt mercury-containing wastewater will be generated during the production process. After the "Discharge Standards of Water Pollutants for Caustic Soda and Polyvinyl Chloride Industry" was upgraded, it was stipulated that the mercury content in the water after mercury-containing wastewater treatment was increased from the initial 0.005mg / L to 0.003mg / L. It is even stricter than the industry...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20C02F103/36
CPCC02F9/00C02F1/001C02F2001/007C02F1/52C02F1/66C02F1/283C02F1/78C02F1/5236C02F1/5281C02F2101/20C02F2103/36C02F2301/08Y02P10/20
Inventor 刘政
Owner 北京铭泽源环境工程有限公司
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