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Agent for removing chloride ions in acidic wastewater, dechlorination method and application

A technology of polluted acid wastewater and chloride ions, which is applied in separation methods, water/sewage treatment, chemical instruments and methods, etc., can solve the problem of restricting the smooth progress of the technology of resource management and reuse of polluted acid wastewater, and the chloride ion concentration cannot be reached. The requirements for the reuse of polluted acid wastewater and the high price of waste copper slag can achieve the effect of recycling and resource utilization, good economic and environmental benefits, and high dechlorination efficiency.

Active Publication Date: 2020-06-19
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with impurities such as heavy metals and arsenic, the concentration of chloride ions in this type of wastewater can reach thousands to tens of thousands of ppm, which is extremely difficult to remove
[0003] The current industrial method for removing chloride ions in this type of wastewater is to use copper sulfate and waste copper slag produced in the smelting process as chlorine removers, so that zero-valent copper and chloride ions contained in divalent copper and copper slag can be neutralized. Reaction generates cuprous chloride precipitation, thereby chlorine ion is removed, but this method removes chlorine efficiency low (only about 60%), and the concentration of chloride ion after treatment can't meet the requirement of polluted acid wastewater reuse, and the price of waste copper slag High, large amount, resulting in high cost of the method
[0004] In addition, the method of using bismuth oxide as a chlorine removal agent to react with chloride ions to produce bismuth oxychloride precipitation, thereby removing chloride ions, has also been widely accepted because of its high efficiency (up to 92%). Concern, but this method is only applicable to sewage acid wastewater containing sulfuric acid concentration higher than 70g / L, and the amount of bismuth oxide required is large, resulting in extremely high cost, which greatly limits the application of this method in industry
[0005] In view of the above-mentioned technical defects, the removal of chloride ions in sewage acid wastewater is still a big technical problem, which greatly limits the smooth progress of resource treatment and reuse technology of sewage acid wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for removing chloride ions in sewage acid wastewater, including: adding 1.47g of sodium bismuth dihydrate to 200mL sewage acid wastewater with hydrogen ion and chloride ion concentrations of 1.02mol / L and 2471mg / L, respectively, Magnetic stirring at room temperature of 20℃, stirring frequency of 100r / min, the residual concentration of chloride ions in the acid wastewater after 80 minutes of reaction is 39.5mg / L (determined by the chloride ion selective electrode method), and the removal rate of chloride ions is 98.4% . The chlorine gas generated during the reaction was passed through the pipe on the container into a 10 mL absorption container containing 9 wt% sodium hydroxide solution for absorption, and a chlorine gas absorption liquid with a concentration of 3.24 wt% was obtained. The solid product of bismuth oxychloride was filtered, washed, dried at 60°C for 30 minutes, and then added to the above 10mL chlorine absorption solution, stirred magnetically at ro...

Embodiment 2

[0044] A method for removing chloride ions in dirty acid wastewater includes: adding 2.73 g of sodium bismuth dihydrate to 400 mL of dirty acid wastewater with hydrogen ion and chloride ion concentrations of 0.82 mol / L and 2300 mg / L, respectively. Magnetic stirring at room temperature of 20°C, stirring frequency of 150r / min, residual concentration of chloride ions in the sewage acid wastewater after reaction for 120 minutes is 39.1mg / L (determined by chloride ion selective electrode method), and the removal rate of chloride ions is 98.3%. The chlorine gas generated during the reaction was passed through the pipe on the container into a 20 mL absorption container containing 10 wt% sodium hydroxide solution for absorption, and a chlorine gas absorption liquid with a concentration of 3.01 wt% was obtained. The solid product of bismuth oxychloride was filtered, washed, dried at 60°C for 30 minutes, and then added to the above 20mL chlorine absorption solution, stirred magnetically a...

Embodiment 3

[0046] A method for removing chloride ions in dirty acid wastewater includes: adding 2.70 g of sodium bismuth dihydrate to 400 mL of dirty acid wastewater with hydrogen ion and chloride ion concentrations of 0.89 mol / L and 2272 mg / L, respectively. Magnetic stirring at room temperature of 30℃, stirring frequency of 150r / min, the residual concentration of chloride ion in the acid wastewater after 90 minutes of reaction is 25.0mg / L (determined by chloride ion selective electrode method), and the removal rate of chloride ion is 98.9%. The chlorine gas generated during the reaction was passed through the pipe on the container into a 20 mL absorption container containing 9 wt% sodium hydroxide solution for absorption, and a chlorine gas absorption liquid with a concentration of 3.00 wt% was obtained. The solid product of bismuth oxychloride was filtered, washed, dried at 60°C for 30 minutes, then added to the above 20mL chlorine absorption solution, stirred magnetically at 30°C room t...

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Abstract

The invention relates to an agent for removing chloride ions in waste acid wastewater and a dechlorination method and application, and belongs to the technical field of industrial wastewater treatmentand recycling. In order to solve the technical problems of limited dechlorination efficiency, large dosage and high cost of the existing dechlorination agent, the invention provides the agent for removing the chloride ions in the acidic wastewater, and the agent comprises bismuthate and / or bismuthate hydrate. The dechlorination agent provided by the invention is convenient to use and high in dechlorination efficiency, the highest dechlorination efficiency can reach 98.9%, and the dechlorination agent can be regenerated and recycled, so that the cost is relatively low, the problem of removal of chloride ions in the waste acid wastewater is solved, and resource recycling of the chloride ions in the waste acid wastewater is realized.

Description

Technical field [0001] The invention relates to a medicament for the removal of chloride ions in sewage acid wastewater and a dechlorination method and application, belonging to the technical field of industrial wastewater treatment and reuse. Background technique [0002] The sewage acid wastewater from the sulfuric acid industry and non-ferrous metal smelting industries has a large amount of production, high acidity (sulfuric acid concentration of 5-20%), and usually contains high concentrations of heavy metals, arsenic, fluorine, chlorine and other impurities. It is a type of extremely difficult to treat Waste water. In order to realize the resource treatment of acid wastewater, in recent years, researchers have proposed to remove the impurities in the acid wastewater, and the acid solution after the removal of impurities is recycled as dilute sulfuric acid. Compared with impurities such as heavy metals and arsenic, the concentration of chloride ions in this type of wastewate...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/72B01D53/78B01D53/68C02F101/12
CPCB01D53/68B01D53/78B01D2251/302B01D2251/304B01D2251/404B01D2251/604C02F1/58C02F1/72C02F2101/12
Inventor 彭先佳窦文月胡星云孔令昊
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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