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Method for treating paraquat wastewater at normal pressure

A technology for atmospheric pressure treatment and paraquat, which is applied in the field of paraquat wastewater treatment, can solve the problems of failure to recover useful substances, high treatment costs, waste of resources, etc. Effect

Active Publication Date: 2014-04-09
WEIFANG ZHONGHUI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a large investment and high treatment costs, and the useful substances in the wastewater cannot be recovered, resulting in a waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for treating paraquat wastewater under normal pressure, the steps are as follows:

[0030] S1, adding waste hydrochloric acid to the paraquat wastewater to adjust the pH to 7.5 to obtain 5 kg of pretreated wastewater;

[0031] S2, the preparation of medicament solution: weigh 100g of medicament, promptly use weight to be 2% of pretreatment waste water weight, add water to medicament, fully stir and dissolve, and described medicament is polyaluminum chloride 80g, polyferric sulfate 10g, shell Polysaccharide 4.8g, activated carbon 4.8g, and polyacrylamide 0.4g are mixed and compounded. The weight of water used to dissolve the medicament is 7% of the weight of the pretreated wastewater;

[0032] S3. Pour the pretreated waste water in step S1 into an atmospheric kettle, add the medicament solution prepared in step S2, and stir vigorously at a speed of 500r / min for 1min to fully mix the medicament solution and waste water, and then use 100r / min Stir at a low speed ...

Embodiment 2

[0038] A method for treating paraquat wastewater under normal pressure, the steps are as follows:

[0039] S1, adding waste hydrochloric acid to the paraquat wastewater to adjust the pH to 7.5 to obtain 5 kg of pretreated wastewater;

[0040] S2, the preparation of medicament solution: weigh 400g of medicament, promptly use weight to be 8% of pretreatment waste water weight, add water in medicament, fully stir and dissolve, and described medicament is polyaluminum chloride, polyferric sulfate, chitosan , activated carbon, and polyacrylamide are mixed and compounded. The mass fractions of polyaluminum chloride, polyferric sulfate, chitosan, activated carbon, and polyacrylamide are 80%, 10%, 4.8%, and 4.8%, 0.4%, the weight of the water used to dissolve the agent is 10% of the weight of the pretreated wastewater;

[0041] S3. Pour the pretreated waste water in step S1 into an atmospheric pressure kettle, add the medicament solution prepared in step S2, stir vigorously at a spee...

Embodiment 3

[0047] A method for treating paraquat wastewater under normal pressure, the steps are as follows:

[0048] S1, adding waste hydrochloric acid to the paraquat wastewater to adjust the pH to 7.5 to obtain 5 kg of pretreated wastewater;

[0049] S2, the preparation of medicament solution: weigh 300g of medicament, promptly use weight to be 6% of pretreatment waste water weight, add water in medicament, fully stir and dissolve, and described medicament is polyaluminum chloride, polyferric sulfate, chitosan , activated carbon, and polyacrylamide are mixed and compounded. The mass fractions of polyaluminum chloride, polyferric sulfate, chitosan, activated carbon, and polyacrylamide are 80%, 10%, 4.8%, and 4.8%, 0.4%, the weight of water used to dissolve the agent is 8% of the weight of the pretreated wastewater;

[0050] S3. Pour the pretreated wastewater in step S1 into an atmospheric pressure kettle, add the medicament solution prepared in step S2, and stir vigorously at a speed ...

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Abstract

The invention discloses a method for treating paraquat wastewater at normal pressure. The method comprises the following steps: adding acid into the paraquat wastewater to adjust the pH value to be 7.5-8.0, preparing a medicine solution, adding the medicine solution to stir so as to obtain a material liquid, centrifuging, combusting the centrifuged residues, feeding the centrifugate into a normal pressure kettle with an ultraviolet lamp device of 100-5,000w, adding acid to adjust the pH value to be 3-4, adding a certain amount of iron sulfate heptahydrate, stirring to dissolve, subsequently powering on the ultraviolet lamp, dropping 30wt% hydrogen peroxide, reacting for 0.1-1 hour at normal temperature after the dropping is accomplished, dropping liquid ammonia till the pH value is 8, putting into a centrifugal machine to centrifuge so as to remove iron cement, feeding the centrifugate into an evaporation device to evaporate water which meets the pollution discharge standards of municipal sewage treatment plants and can be directly discharged, recycling and reusing the concentrated liquid, and obtaining a byproduct, namely, faint yellow ammonium chloride. The method is rapid in reaction speed, high in efficiency, high in performance cost ratio, low in investment and cost and simple in process.

Description

technical field [0001] The invention relates to a method capable of treating paraquat wastewater under normal pressure. Background technique [0002] Currently, paraquat is one of the most widely used herbicides in the world, and its demand is high. The production of paraquat by the cyanamide method is currently the highest yield process route, but the problem of wastewater treatment during the synthesis process has not been completely resolved. This kind of wastewater has the characteristics of high COD, high chroma, high salt content, and is not easy to be oxidized, so it is difficult to deal with it by general methods. [0003] In the existing technology, most foreign countries adopt the method of distilling waste water first and then incinerating it, that is, the waste water is first distilled to remove part of the water, and the concentrated solution is incinerated in an incinerator to achieve the purpose of decomposing oxides and cyanides. However, this method requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/32C02F1/72C02F1/28C02F1/52C02F1/56
Inventor 傅鹏远宋表李华青
Owner WEIFANG ZHONGHUI CHEM
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