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Treatment method for waste liquid produced by permanganate titration COD (chemical oxygen demand) online determination instrument

A technology for potassium permanganate and waste liquid treatment, which is applied in chemical instruments and methods, water/sewage treatment, reduced water/sewage treatment, etc., and can solve the problems of high concentration, no waste liquid treatment device, and secondary pollution. , to achieve the effect of removing toxic heavy metals, fast and effective treatment, and eliminating interference

Active Publication Date: 2015-03-11
上海摩威环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is directly discharged into the sewer without treatment, it will cause serious secondary pollution.
In particular, our country is now in a period of rapid development, environmental supervision is increasing, and environmental protection departments around the world are actively installing online monitoring equipment for water quality and pollution sources. At present, most imported and domestic "COD online analyzers" use national standard permanganate Potassium method is used to measure COD, and these online analyzers are not designed with waste liquid treatment devices. These waste liquids containing toxic heavy metal ions are discharged into sewers or field environments. Although the amount is not large each time, the concentration is high. It will cause serious secondary pollution, so it is increasingly urgent to study the treatment method of the waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 1L potassium permanganate method in the reactor to measure the waste liquid that COD instrument produces on-line, the metal ion concentration in the waste liquid is, Mn 2+ : lg / L, MnO 4 - : 2.1g / L, Ag + : 0.2g / L.

[0026] Preparation of transforming agent solution: Na 2 C 2 o 4 、Na 2 S 2 o 3 ·5H 2 O, Fe 2 (SO 3 ) 3 , FeCl 2 , ethanol and phenol are added in water, stirring and dissolving, obtain transforming agent solution, in the described transforming agent solution, Na 2 C 2 o 4 The concentration is 10g / L, Na 2 S 2 o 3 ·5H 2 The concentration of O is 24.5g / L, FeSO 4 The concentration is 5.2g / L, FeCl 2 The concentration of the solution is 0.2g / L, the concentration of ethanol is 15.1g / L, the concentration of phenol is 15.1g / L, and the pH range of the solution is between 6.5 and 8.5;

[0027] Add 5L conversion agent solution to the reactor, heat to 70°C and stir for 2 minutes, at this time, the waste liquid does not contain MnO 4 - ions, cont...

Embodiment 2

[0030] Add 1L potassium permanganate method in the reactor to measure the waste liquid that COD instrument produces on-line, the metal ion concentration in the waste liquid is, Mn 2+ : 2g / L, MnO 4 - : 0.1g / L, Ag + : 0g / L.

[0031] Preparation of transforming agent solution: Na 2 C 2 o 4 、Na 2 S 2 o 3 ·5H 2 O, Fe 2 (SO 3 ) 3 , FeCl 2 , ethanol is added in water, stirs and dissolves, obtains transformation agent solution, and in described transformation agent solution, Na 2 C2 o 4 The concentration is 2g / L, Na 2 S 2 o 3 ·5H 2 The concentration of O is 14.5g / L, FeSO 4 The concentration is 3.1g / L, FeCl 2 The concentration of ethanol is 0.2g / L, the concentration of ethanol is 10.1g / L, and the pH range of the solution is between 6.5 and 8.5.

[0032] Add 5L conversion agent solution to the reactor, heat to 70°C and stir for 2 minutes, at this time, the waste liquid does not contain MnO 4 - ions, containing only Mn 2+ ion;

[0033] Then add 6g Ca(OH) to the r...

Embodiment 3

[0035] Add 1L potassium permanganate method in the reactor to measure the waste liquid that COD instrument produces on-line, the metal ion concentration in the waste liquid is, Mn 2+ : 1.4g / L, MnO 4 - : 0.4g / L, Ag + : 1.5g / L.

[0036] Preparation of transforming agent solution: Na 2 C 2 o 4 , FeCl 2 , ethanol is added in water, stirs and dissolves, obtains transformation agent solution, and in described transformation agent solution, Na 2 C 2 o 4 The concentration is 3g / L, FeCl 2 The concentration of ethanol is 1.9g / L, the concentration of ethanol is 20.1g / L, and the pH range of the solution is between 6.5 and 8.5.

[0037] Add 5L conversion agent solution to the reactor, heat to 75°C and stir for 2 minutes, at this time, the waste liquid does not contain MnO 4 - ions, containing only Mn 2+ ion:

[0038] Then add 10g Na to the reactor 2 CO 3 , stirring and reacting for 5 minutes; stand still, drain the supernatant, separate the supernatant and sediment, add 25%...

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Abstract

The invention provides a treatment method for waste liquid produced by a permanganate titration COD (chemical oxygen demand) online determination instrument. The treatment method for the waste liquid produced by the permanganate titration COD online determination instrument is characterized by comprising the following steps: firstly, preparing a transforming agent solution, wherein concentration of Na2C2O4 in the transforming agent solution is 1-50g / L, concentration of Na2S2O3.5H2O is 0-100g / L, concentration of FeSO4 is 0-27g / L, concentration of FeCl2 is 0-23g / L, concentration of ethyl alcohol is 0-24g / L and concentration of phenol is 0-24g / L; secondly, adding the transforming agent solution into the waste liquid which is produced by the permanganate titration COD online determination instrument, heating, stirring and performing reaction; thirdly, adding alkaline into the waste liquid after the reaction in the step two is finished, stirring and performing reaction, standing after the reaction is finished, separating supernate from sediment, and regulating pH value of the supernate to be 7.0-8.0, so that treated waste liquid is obtained. By adopting the treatment method for the waste liquid produced by the permanganate titration COD online determination instrument, the waste liquid produced by COD online determination by adopting a national standard method can be rapidly and comprehensively treated, and solution which is difficult to store and has high toxicity can be transformed into solid which is easy to store and transport and has low toxicity.

Description

technical field [0001] The invention relates to a method for treating the waste liquid produced by the on-line COD measuring instrument by the potassium permanganate method, which is used for treating the waste liquid produced by the on-line COD measuring instrument by the potassium permanganate method. Background technique [0002] Potassium permanganate method for measuring COD is the currently recognized standard method for measuring COD at home and abroad (edited by the National Environmental Protection Agency, Water and Wastewater Monitoring and Analysis Methods [M]. 4th Edition. Beijing: Environmental Science Press, 2002, 10-213 ). The principle of determination is: the mixture of water sample, potassium permanganate, and concentrated sulfuric acid is heated to 100°C in the digestion tank, and the permanganate ion is used as an oxidant to reduce the manganese from positive 7 to positive 2 and change the color. The ORP value of the medium solution corresponds to the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/62C02F1/64
Inventor 丁明光王恩强
Owner 上海摩威环境科技股份有限公司
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