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A kind of treatment method of cod and ammonia nitrogen mixed waste liquid

A treatment method and waste liquid technology, applied in chemical instruments and methods, filtration treatment, multi-stage water treatment, etc., can solve the problems of unsuitable waste liquid treatment with complex components, cumbersome operation, and strong pertinence, so as to reduce vulcanization Hydrogen gas, ensure the quality of effluent water, save the effect of treatment cost

Active Publication Date: 2020-01-21
SHENZHEN GREEN EN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for COD and ammonia nitrogen mixed waste liquid, aiming to solve the problem that the existing sewage treatment method is cumbersome to operate, involves many reagents, is highly targeted, and is not suitable for waste liquid treatment with complex components. And there is currently no reasonable and effective treatment system for COD and ammonia nitrogen mixed waste liquid

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  • A kind of treatment method of cod and ammonia nitrogen mixed waste liquid

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Embodiment 1

[0042] A treatment method for COD and ammonia nitrogen mixed waste liquid, comprising the following steps:

[0043] S11. Provide COD measurement waste liquid and ammonia nitrogen measurement waste liquid, mix the COD measurement waste liquid and ammonia nitrogen measurement waste liquid to form 10ml of mixed waste liquid, use sodium hydroxide to adjust the pH to 6-7, precipitate, and perform the first filtration treatment After, obtain the first filtrate;

[0044] S12. Add ferrous sulfate heptahydrate in the first filtrate, stir and let it stand for a period of time, the Cr 6+ reduced to Cr 3 + , precipitate chromium, iron, carry out the second filtration treatment, obtain the second filtrate, the second filtrate is settled to 100ml;

[0045] S13. Add sodium sulfide to the second filtrate, adjust the pH to 9-9.5, precipitate mercury and silver, perform the third filtration treatment, obtain the third filtrate, and adjust the third filtrate to 25ml;

[0046] S14. Pass the t...

Embodiment 2

[0050] A treatment method for COD and ammonia nitrogen mixed waste liquid, comprising the following steps:

[0051] S21. Provide COD measurement waste liquid and ammonia nitrogen measurement waste liquid, mix the COD measurement waste liquid and ammonia nitrogen measurement waste liquid at a volume ratio of 1:1 to form 10ml of mixed waste liquid, adjust the pH to 6-7 with sodium hydroxide, Precipitation, after the first filtration treatment, the first filtrate is obtained;

[0052] S22. Add ferrous sulfate heptahydrate in the first filtrate, stir and let it stand for a period of time, the Cr 6+ reduced to Cr 3 + , precipitate chromium, iron, carry out the second filtration treatment, obtain the second filtrate, the second filtrate is settled to 100ml;

[0053] S23. Add sodium sulfide to the second filtrate, adjust the pH to 9-9.5, precipitate mercury and silver, perform a third filtration treatment to obtain a third filtrate, and set the volume of the third filtrate to 25ml...

Embodiment 3

[0058] A treatment method for COD and ammonia nitrogen mixed waste liquid, comprising the following steps:

[0059] S31. Provide COD measurement waste liquid and ammonia nitrogen measurement waste liquid, mix the COD measurement waste liquid and ammonia nitrogen measurement waste liquid at a volume ratio of 1:1 to form 10ml of mixed waste liquid, adjust the pH to 6-7 with sodium hydroxide, Precipitation, after the first filtration treatment, the first filtrate is obtained;

[0060] S32. Add 0.005g ferrous sulfate heptahydrate to the first filtrate, stir and let it stand for a period of time, the Cr 6+ reduced to Cr 3+ , precipitate chromium, iron, carry out the second filtration treatment, obtain the second filtrate, the second filtrate is settled to 100ml;

[0061] S33. Add sodium sulfide to the second filtrate, adjust the pH to 9-9.5, precipitate mercury and silver, perform a third filtration treatment to obtain a third filtrate, and set the volume of the third filtrate to...

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Abstract

The invention provides a treatment method for COD and ammonia nitrogen mixed waste liquor. The treatment method includes the following steps that COD determination waste liquor and ammonia nitrogen determination waste liquor are provided, the COD determination waste liquor and the ammonia nitrogen determination waste liquor are mixed to form mixed waste liquor, the pH is regulated to be 6-7 with sodium hydroxide, precipitation is carried out, and after first-time filtration treatment is carried out, first filter liquor is obtained; ferrous sulfate septihydrate is added into the first filter liquor to reduce Cr6+ into Cr3+, chromium and iron are precipitated, second-time filtration treatment is carried out, and second filter liquor is obtained; sodium sulphide is added into the second filter liquor, the pH is regulated to be 9-9.5, precipitated mercury and silver are removed, third-time filtration treatment is carried out, and third filter liquor is obtained; the third filter liquor passes through a coconut shell adsorption column, and waste water is directly emitted.

Description

technical field [0001] The invention belongs to the technical field of chemical waste liquid treatment, and in particular relates to a treatment method for mixed waste liquid of COD and ammonia nitrogen. Background technique [0002] Chemical oxygen demand (COD) is an important indicator used to measure the degree of water pollution at home and abroad. Potassium dichromate reflux method is a standard method for the determination of COD that is unanimously recognized at home and abroad, that is, potassium dichromate is used as an oxidant to treat water samples Expressed by the amount of oxidant consumed. The waste liquid produced by the potassium dichromate reflux method, that is, the waste liquid of COD determination, contains toxic and harmful substances such as sulfuric acid, silver sulfate, mercury sulfate and potassium chromate, especially the hexavalent chromium in the waste liquid of COD determination is more toxic. Ammonia nitrogen refers to ammonia in the form of fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/001C02F1/286C02F1/5236C02F1/70C02F9/00C02F2301/08
Inventor 谢聪易丽德黄俊
Owner SHENZHEN GREEN EN ENVIRONMENTAL PROTECTION TECH