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

Active Publication Date: 2022-04-19
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Application Information

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Problems solved by technology

Although this method can treat ammonia nitrogen wastewater, the recovery value of ammonium sulfate generated is not very high

Method used

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

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Embodiment 1

[0032] The ammonium sulfate wastewater produced by a rare earth processing enterprise has been tested and found that the pH of the wastewater is 5, the ammonia nitrogen is 880ppm, and the conductivity is 1.7ms / cm.

[0033]A method for treating high-ammonia-nitrogen wastewater using formaldehyde as an ammonia absorbent, comprising the following steps: a. Raw material preparation: preparing ammonia-nitrogen wastewater pretreated by ultrafiltration; Adjustment of PH value; c. deamination: absorb the deamination film after dehydration by formaldehyde solution; d. output: classify and export the deamination wastewater and urotropine generated after deamination treatment; The ammonia nitrogen concentration in the ammonia nitrogen wastewater in 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 ammonia membrane is a hydrophobic microporous membrane, and its material is polypropylene,...

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PUM

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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%.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C07D487/18C02F101/16
CPCC02F9/00C07D487/18C02F1/02C02F1/66C02F1/586C02F1/444C02F2101/16
Inventor 程棋波姚微丁国良赵经纬
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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