Treatment method for analyzing waste liquid

A technology for analyzing waste liquid and treatment methods, which is applied in the treatment of waste liquid containing Cr6+, Cr3+, Fe3+, and in the field of waste liquid produced by COD analysis by potassium dichromate method, which can solve the problem of unsuitable separation of waste liquid, safety and harmlessness, and resources waste and other problems, to achieve the effect of enhancing the curing and stabilization effect, eliminating environmental pollution, and reducing treatment costs

Active Publication Date: 2014-04-23
POTEN ENVIRONMENT GRP +1
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] Because the components in the analysis waste liquid are complex and the single treatment method is not thorough, it is difficult to treat the waste liquid safely and harmlessly.
Firstly due to Cr(OH) 3 It can be dissolved in strong alkali solution, so when adding alkali to precipitate Cr 3+ , Fe 3+ , Hg 2+ When the pH value is difficult to control, when the pH is low, Fe 3+ , Hg 2+ The precipitation is not complete, and when the pH is high, Cr(OH) 3 Cr in effluent due to dissolution 3+ , which can be re-oxidized to Cr in an oxidizing environment 6+ , resulting in incomplete detoxi

Method used

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  • Treatment method for analyzing waste liquid

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0044] Example 1:

[0045] Please refer to figure 1 Shown is a process flow diagram of a preferred embodiment of the processing method for analyzing waste liquid of the present invention. 1000ml of analytical waste liquid produced by the potassium dichromate method for COD determination is placed in 1# sedimentation tank, and 3g of sodium chloride is added to the waste liquid. + It is converted into silver chloride precipitation and separated by filtration, silver chloride is recovered, and the waste liquid is transferred to 2# precipitation tank;

[0046] Adjust the pH value of the waste liquid in the 2# precipitation tank with sodium hydroxide solution to 2.5, and add 25g of ferrous sulfate hexahydrate, preferably stirring at a speed of 150 rpm for 30 minutes;

[0047] Adjust the pH value of the above waste liquid to 11 with sodium hydroxide solution, and add 10 mg of polyacrylamide, preferably stirring at a speed of 150 rpm for 2 min, and then at a speed of 50 rpm for 30 min, and...

Example Embodiment

[0053] Example 2:

[0054] Please refer to figure 1 Shown is the process flow diagram of the processing method for analyzing waste liquid of the present invention. 1000ml of analytical waste liquid produced by the potassium dichromate method for COD determination is placed in 1# sedimentation tank, and 2g of sodium chloride and 1.5g of ferrous chloride are added to the waste liquid. + It is converted into silver chloride precipitation and separated by filtration, silver chloride is recovered, and the waste liquid is transferred to 2# precipitation tank;

[0055] Adjust the pH value of the waste liquid in the 2# precipitation tank with sodium hydroxide solution to 3.0, add 15 g of ferrous sulfate hexahydrate and 25 g of sodium sulfite, preferably at a speed of 150 rpm for 30 min;

[0056] Adjust the pH value of the above waste liquid to 11.5 with sodium hydroxide solution, and add 5 mg of polyacrylamide, preferably stirring at a speed of 150 rpm for 2 min, and then at a speed of 50 r...

Example Embodiment

[0062] Example 3:

[0063] Please refer to figure 1 Shown is the process flow diagram of the processing method for analyzing waste liquid of the present invention. 1000ml of analytical waste liquid produced by the potassium dichromate method for COD determination is placed in 1# sedimentation tank, and 2.0 g of sodium chloride is added to the waste liquid, and it is allowed to stand after proper stirring. + It is converted into silver chloride precipitation and separated by filtration, silver chloride is recovered, and the waste liquid is transferred to 2# precipitation tank;

[0064] Adjust the pH value of the waste liquid in the 2# precipitation tank with sodium hydroxide solution to 2.85, add 10g of sodium metabisulfite and 30g of sodium sulfite, preferably stirring at a speed of 150 rpm for 30 minutes;

[0065] Adjust the pH value of the waste liquid to 11.8 with sodium hydroxide solution, and add 5 mg of polyacrylamide, preferably stirring at a speed of 150 rpm for 2 min, and t...

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Abstract

The invention discloses a treatment method for analyzing a waste liquid. The waste liquid contains Cr<6+>, Cr<3+> and Fe<3+>; the method comprises the following steps: (I) adding a pH regulator into the waste liquid to adjust the pH value of the waste liquid to 2-4, and adding a reducing agent to convert Cr<6+> into Cr<3+>; (II) adding a pH regulator to adjust the pH value of the solution after the reducing reaction to 10-12 so that the Fe<3+> in the solution is converted into Fe(OH)3 and subjected to coagulating precipitation for separation; and (III) adding a pH regulator to adjust the pH value of the solution after the precipitation to 6-9 so that the Cr<3+> in the solution is converted into Cr(OH)3 and precipitated and separated out. The treatment method for analyzing waste liquid disclosed by the invention effectively separates heavy metals in the waste liquid.

Description

technical field [0001] The invention relates to a treatment method for analyzing waste liquid, in particular to a Cr-containing 6+ 、Cr 3+ , Fe 3+ The waste liquid treatment method is especially suitable for the waste liquid produced by the potassium dichromate method for COD analysis. Background technique [0002] Laboratory analysis and testing often produce a large amount of waste liquid, such as the determination of chemical oxygen demand (Chemical Oxygen Demand, COD) by potassium dichromate method, the determination of iron in iron ore by potassium dichromate method, and the determination of iron in soil by potassium dichromate method. Analytical waste liquid generated from organic matter, etc., containing Cr 6+ 、Cr 3+ , Fe 3+ If the plasma waste liquid is discharged directly, it will not only cause environmental pollution, but also cause a great waste of resources. [0003] COD is a comprehensive and important indicator for evaluating the degree of organic polluti...

Claims

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Application Information

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IPC IPC(8): C02F9/04C04B28/00C02F1/66C02F1/70C02F1/52C02F1/56C02F101/20C02F101/22
Inventor 王春雨乔瑞平迟娟陈广升赵立军
Owner POTEN ENVIRONMENT GRP
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