A method for treating high ammonia nitrogen wastewater with formaldehyde as ammonia absorbent

A technology for ammonia nitrogen wastewater and ammonia absorption, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problem that the recovery value of ammonium sulfate is not very high
CN110697957BActive Publication Date: 2022-04-19HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
Publication Date
2022-04-19

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Abstract

The method discloses a method for treating high-ammonia-nitrogen wastewater by using formaldehyde as an ammonia absorbent. Adjust the pH value of the ammonia nitrogen wastewater in the process; c. Deamination: absorb the dehydrated deamination membrane through the formaldehyde solution; d. Discharge: classify the deamination wastewater and urotropine generated after the deamination treatment Export; the ammonia nitrogen concentration in the ammonia nitrogen wastewater in the step a is 300-10000mg / L; the heating temperature in the step b is 35-45°C, and the pH value of the ammonia nitrogen wastewater is adjusted to 10-12; the The deamination membrane in the step c is a hydrophobic microporous membrane, and its material is polypropylene, polyethylene, polyvinylidene fluoride or polytetrafluoroethylene; the formaldehyde solution of a certain concentration is that the formaldehyde content in the formaldehyde solution is 3- 8%.
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Description

technical field

[0001] The method belongs to the technical field of wastewater treatment, and in particular relates to a method for treating wastewater with high ammonia nitrogen by using formaldehyde as an ammonia absorbent. Background technique

[0002] Ammonia nitrogen wastewater has a wide range of sources, and the water contains a large amount of ammonium ions and free ammonia.

[0003] At present, the commonly used treatment technologies for ammonia-nitrogen-containing wastewater mainly include air stripping, chemical precipitation, ion exchange, and biological treatment.

[0004] The stripping method is mainly used in the treatment of high-concentration ammonia-nitrogen wastewater, but in actual operation, factors such as pH value, water distribution load, water temperature, and gas-liquid ratio will affect the treatment effect, and the operation is relatively complicated.

[0005] The chemical precipitation method is to add an appropriate amount of magnesium ions an...

Claims

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