Method for removing trivalent arsenic ion and pentavalent arsenic ion in water and system thereof

A trivalent arsenic and pentavalent arsenic technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, adsorbed water/sewage treatment, etc. The effect of easy control, long service life and low operating costs

Inactive Publication Date: 2009-08-26
中矿威德能源科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods commonly used at present are: 1. Chemical flocculation method. The investment of this method is small, but the operation cost is high. Excessive flocculant and reactants need to be added, and a large amount of secondary pollution waste is generated, which cannot be used and is difficult to handle. make the application of the law subject to certain restrictions
2. Resin removal of arsenic, the mechanism is ion exchange, this method is generally suitable for simple arsenic-containing wastewater treatment, the operation is complicated, the resin tends to be scrapped after dozens of desorption, high investment, poor process stability

Method used

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  • Method for removing trivalent arsenic ion and pentavalent arsenic ion in water and system thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] 1. Use the internal tap water of an enterprise (the arsenic content is about 1mg / L), pass through the laminated filter (filtering precision is 200μm), remove the impurities in it, and then flow into the arsenic removal tower.

[0031] 2. Carry out adsorption to remove arsenic, the adsorption flow rate is 30BV / h, and the effluent is discharged up to the standard.

[0032] 3. When the arsenic content in the effluent reaches the leakage control point, the nano-adsorbent is desorbed, and a 3% NaOH+3% NaCl mixture is used for desorption.

[0033] 4. The desorption liquid is sent to the secondary coagulation tank, the pH value is 1, and the coagulant is iron oxide (the dosage is 5 times that of the arsenic content). After coagulation, it enters the sedimentation tank for separation.

[0034] The treatment of arsenic-containing water by nano-adsorbent can make the arsenic content below 0.01mg / L (10ppb), and maintain it until adsorption saturation. After repeated adsorption an...

example 2

[0041] 1. Use the arsenic-containing water inside the beverage company, pass through a laminated filter (filtering precision is 400 μm), remove the impurities in it, and then flow into the arsenic removal tower.

[0042] 2. Carry out adsorption to remove arsenic, the adsorption flow rate is 20BV / h, and the effluent is discharged up to the standard.

[0043] 3. When the arsenic content in the effluent reaches the leakage control point, the nano-adsorbent is desorbed, and a 4% NaOH + 5% NaCl mixture is used for desorption.

[0044] 4. The desorption solution is sent to the primary coagulation tank, the pH value is 4, the coagulant is PAM (the amount is 9 times of the arsenic content), and after coagulation, it enters the sedimentation tank for separation.

[0045] The treatment of the arsenic-containing water by the nano-adsorbent can make the arsenic content below 0.01 mg / L (10 ppb), which meets industrial application.

[0046] data and processing

[0047] Arsenic removal dat...

example 3

[0052] 1. Use the internal process water of an enterprise, pass through a regulated filter (filtering precision of 1 μm), remove impurities in it, and then flow into the arsenic removal tower.

[0053] 2. Carry out adsorption to remove arsenic, the adsorption flow rate is 10BV / h, and the effluent discharges up to the standard.

[0054] 3. When the arsenic content in the effluent reaches the leakage control point, the nano-adsorbent is desorbed, and a 5% NaOH + 3% NaCl mixture is used for desorption.

[0055] 4. The desorption liquid is sent to the three-stage coagulation tank, the pH value is 5, and the coagulant is iron oxide (the dosage is 10 times of the arsenic content), and after coagulation, it enters the sedimentation tank for separation.

[0056] The treatment of arsenic-containing water by nano-adsorbent can make the arsenic content below 0.01mg / L (10ppb), and maintain it until adsorption saturation. After repeated adsorption and desorption for five times, the adsorp...

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Abstract

The invention relates to a method for removing trivalent arsenic ion and pentavalent arsenic ion in water and a system thereof. The invention comprises three parts which are arsenious water pretreatment, nanometer adsorption and desorption liquid treatment. The arsenious water is sent into a filter plant through a pipeline by a water pump. The filter plant is connected with a water inlet of a dearsenicator equipped with nanometer filter materials. The water outlet of the dearsenicator equipped with the nanometer filter materials is up to standard to discharge. The desorption liquid of the dearsenicator equipped with the nanometer filter materials is connected with a liquid inlet of a multi-level coagulation groove. The multi-level coagulation groove is connected with the liquid inlet of a sedimentation tank. The invention has simple technique, stable and reliable running, simple operation and easy control. No medicine is added in the processing process, which does not generate the secondary pollution after the water body is treated. The water obtained by using the method for removing trivalent arsenic ion and pentavalent arsenic ion in water is clear and reaches the discharge standard of national correlation water quality.

Description

technical field [0001] The invention relates to a method for treating arsenic-containing water, in particular to a method for removing trivalent arsenic ions and pentavalent arsenic ions in water. Background technique [0002] Trivalent arsenic ions and pentavalent arsenic ions in polluted water bodies will not degrade and volatilize, and will be enriched and concentrated in aquatic organisms. At the same time, they will pollute the soil and accumulate in the soil, thus entering the crop tissue, passing through water, the atmosphere, Food and other channels enter the human body (animals) and cause harm, so it must be effectively treated to meet the relevant national water quality standards. The methods commonly used at present are: 1. Chemical flocculation method. The investment of this method is small, but the operation cost is high. Excessive flocculant and reactants need to be added, and a large amount of secondary pollution waste is generated, which cannot be used and is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/28C02F1/52
Inventor 何絮文李立雄杨天磊叶明
Owner 中矿威德能源科技(北京)有限公司
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