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
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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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