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Method for treating wastewater containing methanal and methanoic acid

A formic acid and formaldehyde technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of low COD reduction rate, poor formaldehyde removal effect, harsh reaction conditions, etc. The effect of COD reduction, convenient and fast response, and fast response

Active Publication Date: 2011-04-20
SHANGHAI TAIHE INT TRADE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Some people at home and abroad use biological methods to treat formaldehyde wastewater, but this method can only be used for low-concentration wastewater. This is because formaldehyde is very toxic, and it is difficult for general microorganisms to survive in high-concentration wastewater. Treatment to improve the biodegradability of wastewater, and then use biological methods for treatment
[0007] The above-mentioned methods have shortcomings in treatment efficiency, adaptability to high concentrations, and harmlessness. For example, the traditional catalytic oxidation method usually requires high temperature and high pressure, and the reaction conditions are harsh, while the biochemical method is only suitable for specific conditions with low formaldehyde content. Wastewater, in these methods there are more or less shortcomings such as formaldehyde, poor formaldehyde removal effect, and low COD reduction rate

Method used

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Examples

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Effect test

Embodiment 1

[0040] A method for treating N-phosphonomethylglycine (glyphosate) industrial waste water containing higher concentrations of formaldehyde and formic acid, specifically comprising the following steps:

[0041] Prepare a certain concentration of inorganic alkali (sodium hydroxide, potassium hydroxide, etc.) 0.6) g / min, finally obtain the sodium chlorate reaction liquid of certain concentration.

[0042] In a 1000ml three-neck flask, add 500g of waste water containing formaldehyde and formic acid glyphosate (raw material sample formaldehyde, formic acid, COD sampling No. 1) to be treated and raise the temperature to (80-100) °C, add 50-150g of the prepared The sodium chlorate reaction liquid, reaction (0.5-2) h, sampling No. 2, analysis of formaldehyde, formic acid content and waste water COD, adding (5-10) g30% HCl to adjust the pH value, sampling No. 3, analysis of formaldehyde and formic acid content And wastewater COD, the treatment results are as follows:

[0043] ...

Embodiment 2

[0046] A method for treating N-phosphonomethylglycine (glyphosate) industrial waste water containing higher concentrations of formaldehyde and formic acid, specifically comprising the following steps:

[0047] Prepare a 5% sodium hydroxide aqueous solution, raise the temperature to 100° C., and feed chlorine gas for 30 minutes at a flow rate of 0.6 g / min to obtain a sodium chlorate reaction solution.

[0048] Add 500g of waste water containing formaldehyde and glyphosate formate to be treated in a 1000ml three-neck flask, raise the temperature to 100°C, add 50g of the prepared sodium chlorate reaction solution, react for 0.5h, add 30% HCl to adjust the pH The value is 2-3, most of formaldehyde and formic acid can be removed, the removal rate of formaldehyde can reach 99%, the removal rate of formic acid can reach 90%, and the COD of wastewater can be reduced by more than 85%.

Embodiment 3

[0050] A method for treating N-phosphonomethylglycine (glyphosate) industrial waste water containing higher concentrations of formaldehyde and formic acid, specifically comprising the following steps:

[0051] Prepare a 30% sodium hydroxide aqueous solution, raise the temperature to 80° C., and feed chlorine gas for 60 minutes at a flow rate of 0.2 g / min to obtain a sodium chlorate reaction solution.

[0052] Add 500g of waste water containing formaldehyde and glyphosate formate to be treated in a 1000ml three-neck flask, raise the temperature to 80°C, add 150g of the prepared sodium chlorate reaction solution, react for 2 hours, add 30% HCl to adjust the pH value 2-3, to achieve most of the removal of formaldehyde and formic acid, the removal rate of formaldehyde reaches 99%, the removal rate of formic acid reaches 90%, and the COD of wastewater is reduced by more than 85%.

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Abstract

The invention relates to a method for treating N-phosphonomethyl glycine (glyphosate) industrial wastewater containing high-concentration formaldehyde and formic acid. The method adopts the formaldehyde and formic acid from wastewater from sodium chlorate oxidation and wastewater treated by the method reaches biological treatment standards. Compared with the prior art, the method has the advantages that: 1, the method for preparing an aqueous solution of sodium chlorate is safe and effective and the prepared sodium chlorate has strong oxidizability; 2, the prepared aqueous solution of sodium chlorate added into the wastewater containing formaldehyde and formic acid can remove a major part of formaldehyde and formic acid in a short period, and the reaction is simple in method, quick and convenient in operation; and 3, the wastewater containing formaldehyde and formic acid is prepared into an alkali solution at a certain concentration, and chlorine is introduced into the wastewater at ahigh temperature to achieve a good formaldehyde and formic acid removal effect and greatly reduce COD, so the wastewater achieves a pretreatment effect and can be subjected to biological treatment toreach discharge standards.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a method for treating waste water containing formaldehyde and formic acid. Background technique [0002] N-phosphonomethylglycine (glyphosate), as a low-toxicity, broad-spectrum herbicide, is effective against many plants and weeds, and is one of the largest-selling herbicides in the world. The traditional process mostly uses glycine as the raw material for preparation, and the current process tends to use iminodiacetic acid as the raw material, through condensation with formaldehyde and phosphorous acid to generate N-phosphonomethyliminodiacetic acid, and finally oxidized to N-phosphine Acid-methylglycine method. Whether it is the preparation of the intermediate N-phosphonomethyliminodiacetic acid or the final oxidation product N-phosphonomethylglycine, a large amount of process wastewater containing formaldehyde and formic acid will be produced in this process, and formaldehyde, The c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/38C02F1/58C02F101/34
Inventor 王方惠朱正江吴敬怀郑留清田晓宏
Owner SHANGHAI TAIHE INT TRADE CO LTD
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