Pretreatment method for wastewater of ammonia nitrogen in high density

A pretreatment technology for ammonia nitrogen wastewater, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that ammonia nitrogen cannot be recycled and reused, and achieve fast reaction speed and high removal efficiency Effect

Inactive Publication Date: 2006-12-06
HARBIN INST OF TECH
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Problems solved by technology

[0003] Aiming at the deficiency that the treated ammonia nitrogen cannot be recycled and reused in the existing ammonia nitrogen wastewater treatment process, the present invention provides a method for pretreatment of high concentration ammonia nitrogen wastewater. Composite phosphate, the composite phosphate is compounded by two or more mixtures and magnesium salts of phosphate, dihydrogen phosphate, hydrogen phosphate and phosphoric acid, and the molar ratio of each component in the control reaction system is Magnesium salt: Phosphate, dihydrogen phosphate, hydrogen phosphate, mixture of two or more of phosphoric acid: ammonia nitrogen 0.1~10:0.1~10:1.0, the reaction time is 10~60min, pH value is 8.0 ~9.5, then gravity settling for 10~20min, the supernatant is discharged from the system, and the sewage purification is completed

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  • Pretreatment method for wastewater of ammonia nitrogen in high density

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specific Embodiment approach 1

[0010] Embodiment 1: The treatment process of this embodiment is completed in a contact reactor, and the specific process flow is: ammonia nitrogen wastewater enters the reaction tank, and by adding compound phosphate in the reaction tank, the compound phosphate is formed by phosphoric acid salt, dihydrogen phosphate, hydrogen phosphate, a mixture of two or more of phosphoric acid and magnesium salt, and the molar ratio of each component in the reaction system is controlled to be magnesium salt: phosphate, dihydrogen phosphate, A mixture of two or more of hydrogen phosphate and phosphoric acid: ammonia nitrogen = 0.1 to 10: 0.1 to 10: 1.0, wherein the reaction time is 10 to 60 minutes, the pH value is 8.0 to 9.5, and then the gravity settles for 10 to 20 minutes. The supernatant is discharged from the system to complete the sewage purification. The process flow is attached figure 1 shown.

[0011] In this embodiment, the magnesium salt is magnesium chloride, magnesium oxide ...

specific Embodiment approach 2

[0020] Specific embodiment two: in the waste water that influent ammonia nitrogen concentration is 200mg / L, initial pH is 7.46, add composite phosphate, make magnesium: composite phosphate (HPO 4 2- and PO 4 3- The molar ratio is 1:3): nitrogen=1.4:0.9:1.0 (molar ratio), the system does not adjust the pH separately, the concentration of ammonia nitrogen in the effluent drops below 39.14mg / L, the removal rate is above 80.42%, and the pH of the system after the reaction is 9.23.

[0021] Specific embodiment three: adding composite phosphate to make magnesium: composite phosphate (HPO 4 2- and PO 4 3- The molar ratio is 2:1): nitrogen = 1.4:0.9:1.0 (molar ratio), the pH of the system is not adjusted separately, the concentration of ammonia nitrogen in the effluent drops below 20.93mg / L, the removal rate is 89.54%, and the pH of the system after the reaction is 9.42 .

[0022] Specific embodiment four: in the waste water that influent ammonia nitrogen concentration is 200m...

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Abstract

This invention discloses a method for pretreating high-concentration ammonia-nitrogen wastewater. The method comprises: (1) introducing ammonia nitrogen wastewater into a reactor; (2) adding composite phosphates that are composed of magnesium salt and two or more of phosphates, dihydrogen phosphates, hydrogen phosphates and phosphoric acid, and reacting at pH 8.0-9.5 for 10-60 min; (3) precipitating under gravity for 10-20 min, and discharging the supernatant. Compared with present techniques, the method uses composite phosphates to remove high-concentration ammonia-nitrogen, thus having some advantages. Besides, the method does not require the adjustment of pH value separately, and the obtained ammonium magnesium phosphate can be used as a fertilizer.

Description

technical field [0001] The invention belongs to the field of sewage treatment and relates to a pretreatment method for ammonia nitrogen wastewater. Background technique [0002] With the aggravation of water eutrophication, people pay special attention to the removal of ammonia nitrogen in wastewater. The existing ammonia nitrogen wastewater treatment technologies mainly include: biological method, air stripping method, chemical precipitation method, etc., but all have shortcomings. Biological treatment of wastewater containing ammonia nitrogen is considered to be the most effective and economical method, but it is powerless for wastewater containing high concentration ammonia nitrogen; stripping method is suitable for treating wastewater containing high concentration ammonia nitrogen, but its larger reactor, relatively The high sewage flow rate and high energy consumption limit its practical application, and the most important thing is that this method brings secondary pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C05B17/00
Inventor 李伟光闫立龙李娟
Owner HARBIN INST OF TECH
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