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High-concentration ammonia-nitrogen wastewater treatment process

A technology of ammonia nitrogen wastewater and treatment process, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problem of large area occupied by sedimentation tanks, and reduce the area occupied, The effect of prolonging the service life and reducing the frequency of backwashing

Active Publication Date: 2014-07-23
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical precipitation method has a simple process for treating ammonia nitrogen wastewater, and the ammonia nitrogen in the effluent can be discharged up to the standard, but this method has the disadvantage that the sedimentation tank occupies a large area

Method used

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Examples

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Effect test

Embodiment 1

[0026] In an electrolytic manganese plant, the concentration of ammonia nitrogen in the effluent is 800~1000mg / L, and the pH value is 4~6.

[0027] The high-concentration ammonia nitrogen wastewater treatment process of the present embodiment comprises the following specific steps:

[0028] (1) Send the waste water to be treated into the reaction pool, add magnesium chloride and disodium hydrogen phosphate into the reaction pool to make the NH in the waste water 3 -N:Mg 2+ :PO 4 3- The molar ratio is 1:2.5:1.5, while adding sodium hydroxide to adjust the pH value of the wastewater to 8.5, and react for 5 minutes;

[0029] (2) Send the waste water that has been processed and fully reacted in step (1) into the microfiltration membrane filter to filter through the microfiltration membrane. The effluent after microfiltration membrane filtration is the wastewater after removing ammonia nitrogen, which is separated after microfiltration membrane filtration The concentrated liqui...

Embodiment 2

[0036] In an electrolytic manganese plant, the concentration of ammonia nitrogen in the effluent is 800~1000mg / L, and the pH value is 4~6.

[0037] The high-concentration ammonia nitrogen wastewater treatment process of the present embodiment comprises the following specific steps:

[0038] (1) Send the waste water to be treated into the reaction pool, add magnesium chloride and sodium dihydrogen phosphate into the reaction pool to make the NH in the waste water 3 -N:Mg 2+ :PO 4 3- The molar ratio is 1:3.5:3.0, while adding sodium hydroxide to adjust the pH value of the wastewater to 9, and react for 3 minutes;

[0039] (2) Send the waste water that has been processed and fully reacted in step (1) into the microfiltration membrane filter to filter through the microfiltration membrane. The effluent after microfiltration membrane filtration is the wastewater after removing ammonia nitrogen, which is separated after microfiltration membrane filtration The concentrated liquid ...

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Abstract

The invention relates to a high-concentration ammonia-nitrogen wastewater treatment process which comprises the following steps: (1) adding magnesium salt and phosphate into wastewater to be treated according to the ammonia-nitrogen concentration of the wastewater, wherein the molar ratio of NH<3->N:Mg<2+>: PO4<3-> in the wastewater is controlled at 1:(2-3.5):(1.5-3.0); and adjusting the pH value of the wastewater by a sodium hydroxide solution to 8.5-9, and stirring for 3-5 minutes; (2) after full reaction, filtering the wastewater by a micro-filtration membrane, wherein effluent generated after filtering by the micro-filtration membrane is the wastewater without ammonia-nitrogen; and dehydrating concentrated solution (separated out after filtration of the micro-filtration membrane) by a plate-and-frame filter press; and (3) after dehydration by the plate-and-frame filter press, refluxing the obtained filtrate and mixing with the wastewater to be treated, wherein the main component of the filter residue is struvite which is directly recovered as an agricultural fertilizer or is regenerated to be recycled. The process provided by the invention is low in cost, and not only can treat ammonia-nitrogen in the wastewater to reach the discharge standard, but also can recycle useful components from the wastewater.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a high-concentration ammonia nitrogen wastewater treatment process. Background technique [0002] At present, with the rapid development of chemical fertilizer, petrochemical and other industries, the resulting high ammonia nitrogen wastewater has also become one of the restrictive factors for the development of the industry. According to reports, hundreds of red tides occur in my country's sea areas every year, and ammonia nitrogen is one of the important causes of pollution, especially the pollution caused by high-concentration ammonia nitrogen wastewater. [0003] At present, the common high-concentration ammonia nitrogen wastewater treatment technologies include stripping, steam stripping, distillation and chemical precipitation. [0004] The blow-off method is to use the difference between the actual concentration and the equilibrium concentration of volati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/16
Inventor 饶冰青
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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