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Method for immediate treatment of waste liquid generated in on-line detection of chemical oxygen demand through a dichromate method

A chemical oxygen demand, dichromate method technology, applied in chemical instruments and methods, reduced water/sewage treatment, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of fully reducing, preventing secondary pollution and avoiding secondary pollution

Inactive Publication Date: 2015-08-05
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the method described in Patent Document 1 is that the reducing agent is added to the waste liquid tank in advance, which may cause the reducing agent to be oxidized during the placement process. On the one hand, it will waste reagents, and on the other hand, it may lead to insufficient reduction of hexavalent chromium.
[0005] In addition, the common disadvantage of the methods described in Patent Document 1 and Patent Document 2 is that the waste liquid generated during detection is processed after being transferred to a waste liquid bucket or collected to a certain volume, and immediate treatment is not realized. It is very harmful, which is easy to cause secondary pollution to the environment; secondly, both methods require the testing personnel to prepare an additional reagent (reducing agent / reducing salt), which causes inconvenience to the waste liquid treatment work

Method used

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  • Method for immediate treatment of waste liquid generated in on-line detection of chemical oxygen demand through a dichromate method
  • Method for immediate treatment of waste liquid generated in on-line detection of chemical oxygen demand through a dichromate method
  • Method for immediate treatment of waste liquid generated in on-line detection of chemical oxygen demand through a dichromate method

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Embodiment 1

[0035] Such as figure 2Shown is a flow chart of the waste liquid immediate treatment method of the present invention. Specifically, the reaction pool was naturally cooled to 95°C, and then 2.64ml of potassium hydrogen phthalate solution with a COD concentration of 500mg / L was added to the reaction pool, and the heater was started to make the environment in the reaction pool reach 180°C and 10 atmospheres. Carry out the reduction reaction, time the reaction for 15 minutes, then the hexavalent chromium in the water sample is reduced to trivalent chromium at this time, the reaction is completed, the reaction pool is cooled to 95°C, and the treated waste liquid is discharged into the waste liquid bucket.

Embodiment 2

[0037] Cool the reaction pool to 70°C naturally, then add 2.64ml of potassium hydrogen phthalate solution with a COD concentration of 500mg / L to the reaction pool, start the heater to make the environment in the reaction pool reach 165°C and 6.5 atmospheric pressure for reduction Reaction, timed reaction for 15 minutes, then the hexavalent chromium in the water sample is reduced to trivalent chromium at this time, the reaction is completed, the reaction pool is cooled to 70°C, and the treated waste liquid is discharged into the waste liquid bucket.

Embodiment 3

[0039] In the part of reagent and COD detection method, the detection reagent is replaced by potassium dichromate solution with sodium dichromate solution, and other conditions and parameters are the same. For the waste liquid generated by the detection, the following methods are adopted to treat the waste liquid:

[0040] Cool the reaction pool to 95°C naturally, then add 2.64ml of potassium hydrogen phthalate solution with a COD concentration of 500mg / L to the reaction pool, start the heater to make the environment in the reaction pool reach 180°C and 10 atmospheric pressure, and carry out the reduction reaction , Time the reaction for 15 minutes, then the hexavalent chromium in the water sample is reduced to trivalent chromium at this time, the reaction is completed, the reaction pool is cooled to 95 ° C, and the treated waste liquid is discharged into the waste liquid bucket.

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Abstract

The present invention discloses a method for immediate treatment of waste liquid generated in on-line detection of chemical oxygen demand through a dichromate method and pertains to the field of waste liquid treatment. In particular the method comprises the steps of: adding a reductant to a reaction cell after finishing detection and conducting reduction reaction in the reaction cell to reduce hexavalent chromium to trivalent chromium. The method disclosed by the present invention is simple in operation, realizes the immediate treatment of waste liquid and avoids causing secondary pollution.

Description

technical field [0001] The invention relates to a waste liquid treatment method, in particular to an immediate treatment method for waste liquid produced by on-line detection of chemical oxygen demand by a dichromate method, and belongs to the field of waste liquid treatment. Background technique [0002] The dichromate method for detecting chemical oxygen demand (COD) is currently a standard method for detecting COD that is recognized at home and abroad. At present, the dichromate method described in the national standard (HJ / T399-2007) is widely used for online detection of COD in China. , but according to the detection method described in the national standard, there will be some remaining potassium dichromate in the waste liquid. Since potassium dichromate is a strong oxidant, it is very harmful to the human body. If it is directly discharged without treatment, it will cause serious damage to the environment. pollution. However, most of the imported or domestic "COD onl...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/22
Inventor 板桥亨久管恩竣
Owner SHIMADZU SEISAKUSHO CO LTD