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Composite denitrification additive for treating ammonia-nitrogen waste water

A technology of ammonia nitrogen wastewater and nitrogen additives, which is applied in the direction of degassed water/sewage treatment, etc., can solve the problems of complex process, high energy consumption of steam distillation, and difficulty in subsequent treatment of sediments.

Inactive Publication Date: 2014-02-05
JIANGXI AMMONIA WATER POLLUTION GOVERNANCE NEMESIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as precipitation method, adsorption method, ion exchange method, biochemical method, distillation method, stripping method, etc. Among them, ammonium magnesium phosphate precipitation method and adsorbent adsorption method are complicated in process, and the follow-up treatment of the precipitate is difficult; ion exchange method and biochemical method can only To treat wastewater with a low concentration of ammonia nitrogen, the steam distillation method has high energy consumption and high treatment cost; the air stripping method is a fast-developing method at present, because of its simple process, low cost of wastewater treatment, and easy recovery of ammonia nitrogen, but this method treats wastewater , the concentration of ammonia nitrogen remaining in the water is relatively high, and it is difficult to meet the discharge standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A compound denitrification aid component is (weight percent):

[0017] Cetyl alkanolamide 5%, its molecular formula is: CH 3( CH 2)14 CON(C 2 h 4 Oh) 2 , dodecyl imidazolinium ammonium 6%, its molecular formula is: CH 3( CH 2)11 CH 2 COO - , cetyl dimethyl betaine 7%, its molecular formula is: CH 3( CH 2)15 N(CH 3 ) + 2 COO - , anionic polyacrylamide (the viscosity average molecular weight is 1.5×10 6 ) 1%, water 81%;

[0018] The compound denitrification additive is applied to the wastewater treatment of a chemical company, the addition amount is 40g / ton, the pH value is adjusted to 12.0, the wastewater temperature is adjusted to 52°C, and the stripping treatment takes 4 hours, the ammonia nitrogen concentration in the wastewater is reduced from 30000mg / L to 2mg / L, the removal rate of ammonia nitrogen is over 99.99%.

Embodiment 2

[0020] A compound denitrification aid component is (weight percent):

[0021] Cetyl alkanolamide 7%, its molecular formula is: CH 3( CH 2)14 CON(C 2 h 4 Oh) 2 , dodecyl imidazolinium ammonium 9%, its molecular formula is: CH 3( CH 2)11 CH 2 COO - , anionic polyacrylamide (the viscosity-average molecular weight is 1×10 6 ) 0.5%, water 83.5%;

[0022] The compound denitrification additive is applied to the wastewater treatment of a coking company. The addition amount is 50g / ton, the pH value is adjusted to 11.5, the wastewater temperature is adjusted to 50°C, and the stripping treatment takes 3.5 hours. The concentration of ammonia nitrogen in the wastewater is reduced from 15000mg / L to 1mg / L, the removal rate of ammonia nitrogen is over 99.99%.

Embodiment 3

[0024] A compound denitrification aid component is (weight percent):

[0025] Dodecanoic acid alkanolamide 6%, its molecular formula is: CH 3( CH 2)10 CON(C 2 h 4 Oh) 2 , cetyl dimethyl betaine 15%, its molecular formula is: CH 3( CH 2)15 N(CH 3 ) + 2 COO - , anionic polycaprolactam (its viscosity-average molecular weight is 1.5×10 6 ) 1.5%, water 77.5%;

[0026] The compound denitrification additive is applied to the wastewater treatment of a pharmaceutical company. The addition amount is 35g / ton, the pH value is adjusted to 12.5, the wastewater temperature is adjusted to 55°C, and the stripping treatment takes 3 hours. The concentration of ammonia nitrogen in the wastewater is reduced from 20000mg / L to 1.5mg / L, the removal rate of ammonia nitrogen is over 99.99%.

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Abstract

The invention relates to a composite denitrification additive for treating ammonia-nitrogen waste water. The composite denitrification additive is prepared by mixing water with one or more of an alkanolamide surface active agent, an alkyl imidazoline amphiprotic surface active agent and an alkyl glycine betaine amphiprotic surface active agent and one or two of anion polyacrylamide and anion polycaprolactamide, wherein the percent of each component in the composite denitrification additive is as follows: 3 to 15 percent of alkanolamide surface active agent, 3 to 15 percent of alkyl imidazoline amphiprotic surface active agent, 3 to 15 percent of alkyl glycine betaine amphiprotic surface active agent, 0.1 to 5 percent of anion polyacrylamide, 0.1 to 5 percent of anion polycaprolactamide and 45 to 90 percent of water. By adopting the composite denitrification additive for treating the ammonia-nitrogen waste water, the Van der Waals force between the ammonia molecules and water molecules can be effectively reduced, the dynamic balance of ammonia molecules at the gas phase and the liquid phase can be changed, the ammonia-nitrogen concentration of the high-concentration ammonia-nitrogen waste water can be reduced to 1mg / L to 5mg / L, and the ammonia-nitrogen removal rate can reach 99.99 percent after the ammonia-nitrogen waste water is treated by the composite denitrification additive.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a composite denitrification aid for ammonia nitrogen waste water treatment. Background technique [0002] Ammonia nitrogen (NH3-N) is an important indicator in water quality standards, and excessive ammonia nitrogen is an important factor for the eutrophication of rivers and lakes. How to remove the high concentration of ammonia nitrogen in domestic sewage and industrial wastewater is a big problem in front of people. At present, there are many ways to remove the high concentration of ammonia nitrogen in wastewater. Such as precipitation method, adsorption method, ion exchange method, biochemical method, distillation method, stripping method, etc. Among them, ammonium magnesium phosphate precipitation method and adsorbent adsorption method are complicated in process, and the follow-up treatment of the precipitate is difficult; ion exchange method and biochemical method can only To treat...

Claims

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Application Information

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IPC IPC(8): C02F1/20
Inventor 李明达李桂生施伟林陆业
Owner JIANGXI AMMONIA WATER POLLUTION GOVERNANCE NEMESIS