Method of removing nitrate nitrogen in wastewater

A technology for nitrate nitrogen and wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of complex catalyst preparation and high price, and achieve enhanced reduction efficiency, Effect of reduction efficiency improvement

Active Publication Date: 2015-09-09
黑龙江怀德环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology generally needs to use noble metals such as Pd, Sn or Cu as catalysts to have a good treatment effect, and the catalysts used have disadvantages such as complicated preparation and expensive prices.

Method used

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  • Method of removing nitrate nitrogen in wastewater

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Effect test

Embodiment 1

[0030] A method for removing nitrate nitrogen in waste water, it comprises the following steps:

[0031] S1. Adjust the pH value: collect the alkaline wastewater into an acid and alkali resistant container, and use sulfuric acid to adjust the pH value of the wastewater to 2;

[0032] S2. Denitrification: add humic acid, activated carbon and iron filings to the wastewater to adjust the pH value, the mass ratio of humic acid, iron filings and activated carbon is 1:2:1, the mass of nitrate nitrogen and iron filings in the wastewater The ratio is 1:20, under the conditions of isolation from the outside air and stirring at 80r / min, react for 60 minutes, separate solid and liquid, and collect the liquid into the chemical sedimentation tank;

[0033] S3. Chemical precipitation: Add disodium hydrogen phosphate dodecahydrate and magnesium chloride hexahydrate to the chemical precipitation tank under the condition of aeration and stirring, and the aeration volume of aeration is 0.1 m 3...

Embodiment 2

[0035] A method for removing nitrate nitrogen in waste water, it comprises the following steps:

[0036] S1. Adjust the pH value: collect the alkaline wastewater into an acid and alkali resistant container, and use sulfuric acid to adjust the pH value of the wastewater to 4;

[0037] S2. Denitrification: add humic acid, activated carbon and iron filings to the wastewater to adjust the pH value, the mass ratio of humic acid, iron filings and activated carbon is 1:100:100, the mass of nitrate nitrogen and iron filings in the wastewater The ratio is 1:350, and the reaction is stirred for 180 minutes under the condition of being isolated from the outside air and the intensity is 200r / min, the solid and liquid are separated, and the liquid is collected into the chemical sedimentation tank;

[0038] S3. Chemical precipitation: Add disodium hydrogen phosphate dodecahydrate and magnesium chloride hexahydrate to the chemical precipitation tank under the condition of aeration and stirri...

Embodiment 3

[0040] A method for removing nitrate nitrogen in waste water, it comprises the following steps:

[0041] S1. Adjust the pH value: collect the alkaline wastewater into an acid and alkali resistant container, and use sulfuric acid to adjust the pH value of the wastewater to 3;

[0042] S2. Denitrification: add humic acid, activated carbon and iron filings to the wastewater to adjust the pH value, the mass ratio of humic acid, iron filings and activated carbon is 1:30:20, the mass of nitrate nitrogen and iron filings in the wastewater The ratio is 1:100, and the reaction is stirred for 100 minutes under the conditions of isolation from the outside air and the intensity of 120r / min, the separation of solid and liquid, and the liquid is collected into the chemical sedimentation tank;

[0043] S3. Chemical precipitation: Add disodium hydrogen phosphate dodecahydrate and magnesium chloride hexahydrate to the chemical precipitation tank under the condition of aeration and stirring, an...

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Abstract

The invention discloses a method of removing nitrate nitrogen in wastewater. The method includes the steps of S1, adjusting pH, to be specific, collecting wastewater in a container resistant to acid and alkali, and adjusting the pH of the wastewater to 2 to 4; S2, performing denitrification, to be specific, adding humic acid, activated carbon and scrap iron into the wastewater, the pH of which is adjusted, performing stirring to allow reaction under isolation with the external air, performing solid-liquid separation, and collecting liquid to a chemical settling pond; S3, allowing chemical settling, to be specific, adding sodium phosphate dibasic dodecahydrate and magnesium chloride hexahydrate into the chemical settling pond under aerated stirring, performing solid-liquid separation after chemical settling reaction, and collecting supernate as treated water. The novel efficient reducing aid, the humic acid, is used with iron-carbon micro-electrolysis, the denitrification process is enhanced, and the removal efficiency of the nitrate nitrogen in the wastewater is improved. Additionally, the method helps effectively remove chemical reduction products and thoroughly remove the nitrate nitrogen from the wastewater.

Description

technical field [0001] The invention relates to a wastewater treatment technology, in particular to a method for removing nitrate nitrogen in wastewater. Background technique [0002] Fertilizer production wastewater, iron and steel production wastewater, landfill leachate membrane filtration concentrate and other wastewater contain a large amount of nitrate. The toxicity of nitrate itself is very low, but after it enters the human body, it can be reduced to nitrite and nitrosoamines that can cause cancer and mutagenesis, which will increase the toxicity and cause harm to human health. Excessive nitrate in water will cause eutrophication of water. In order to protect human health and water resources, my country's "Standards for Pollution Control of Domestic Garbage Landfills" (GB 16889-2008), "Discharge Standards for Pollutants of Urban Sewage Treatment Plants" (GB 18918-2002) and other standards for total nitrogen emissions The limit value is stipulated to limit the disord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 刘咏汪诗翔唐一鸣范琴林珂凡
Owner 黑龙江怀德环保有限公司
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