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Biochemical tail water deep nitrogen and phosphorus removal method based on magnetic coagulation-adsorption coupling

A deep denitrification and magnetic coagulation technology, applied in chemical instruments and methods, magnetic field/electric field water/sewage treatment, water pollutants, etc., can solve problems such as reducing TN concentration, and achieve reasonable steps and excellent deep denitrification and removal. Phosphorus, efficient removal effect

Active Publication Date: 2020-11-06
JIANGSU QICHUANG ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent document with the application number 202010188177.4 discloses a "magnetic coagulation high-efficiency rapid sedimentation purification device and process for municipal sewage treatment", which can effectively reduce the concentration of TP, SS (suspended solids), etc. The concentration of TN

Method used

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  • Biochemical tail water deep nitrogen and phosphorus removal method based on magnetic coagulation-adsorption coupling
  • Biochemical tail water deep nitrogen and phosphorus removal method based on magnetic coagulation-adsorption coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The biochemical effluent from the secondary sedimentation tank of a sewage treatment plant has a TN of 22.6mg / L and a TP concentration of 1.04mg / L.

[0051] (A): Import the biochemical effluent from the secondary sedimentation tank into the mixing tank 1, and add PAC solution with a mass concentration of 10%, and the dosage is 3L / m 3 For the biochemical tail water, the average velocity gradient (G value) of the mixed liquid is 600 / S when stirred by the first stirrer 101, and the mixed reaction is 1.5 min;

[0052] (B): The mixed solution is introduced into the coagulation reaction tank 2, and the average velocity gradient (G value) of the mixed solution is 120 / S when being stirred by the second agitator 201, and the time control of the coagulation reaction is 6 minutes;

[0053] (C): The mixed solution of the coagulation reaction tank 2 is introduced into the adsorption reaction tank 3, and at the same time, the selectively adsorbed nitrate-type magnetic powder (either ...

Embodiment 2

[0058] The biochemical effluent from the secondary sedimentation tank of a sewage treatment plant has a TN of 28.3mg / L and a TP concentration of 1.42mg / L.

[0059] (A): Lead the biochemical effluent from the secondary sedimentation tank into the mixing tank 1, and add PAC solution with a mass concentration of 20%, and the dosage is 2L / m 3 For the biochemical tail water, the average velocity gradient (G value) of the mixed solution is 900 / S when being stirred by the first agitator 101, and the mixing reaction is 2 minutes;

[0060] (B): The mixed solution is introduced into the coagulation reaction tank 2, and the average velocity gradient (G value) of the mixed solution is 180 / S when being stirred by the second agitator 201, and the time control of the coagulation reaction is 8 min;

[0061] (C): The mixed solution of the coagulation reaction tank 2 is introduced into the adsorption reaction tank 3, and at the same time, the selectively adsorbed nitrate-type magnetic powder (e...

Embodiment 3

[0066] The biochemical effluent from the secondary sedimentation tank of a sewage treatment plant has a TN of 15.8mg / L and a TP concentration of 0.76mg / L.

[0067] (A): Lead the biochemical effluent from the secondary sedimentation tank into the mixing tank 1, and add PAC solution with a mass concentration of 15%, and the dosage is 1.5L / m 3 For the biochemical tail water, the average velocity gradient (G value) of the mixed solution is 700 / S when stirred by the first stirrer 101, and the mixed reaction is 1 min;

[0068] (B): The mixed solution is introduced into the coagulation reaction tank 2, and the average velocity gradient (G value) of the mixed solution is 150 / S when stirred by the second agitator 201, and the time of the coagulation reaction is controlled to be 10min;

[0069] (C): The mixed solution of the coagulation reaction tank 2 is introduced into the adsorption reaction tank 3, and at the same time, the selective adsorption nitrate-type magnetic powder (either e...

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Abstract

The invention relates to a biochemical tail water deep nitrogen and phosphorus removal method based on magnetic coagulation-adsorption coupling. The method comprises the following steps: sequentiallyadding a coagulant, selectively adsorbing nitrate type magnetic powder and a coagulant aid into sewage, and finally deeply removing phosphate and nitrate in biochemical tail water through precipitation. Meanwhile, the magnetic powder capable of selectively adsorbing nitrate is recycled and repeatedly utilized by utilizing a magnetic recycling technology. According to the invention, deep nitrogen and phosphorus removal of biochemical tail water can be realized so that the TP and TN indexes in the treated biochemical tail water meet the requirements of related sewage discharge standards.

Description

technical field [0001] The invention relates to the field of advanced treatment of biochemical tail water, in particular to a method for deep nitrogen and phosphorus removal of biochemical tail water based on magnetic coagulation-adsorption coupling. Background technique [0002] In recent years, as my country's water pollution problems have become increasingly prominent, the improvement of the discharge standards of urban sewage plants has become the general trend. Under the trend of increasingly stringent environmental protection requirements, the discharge standards of sewage treatment plants have put forward higher and higher requirements for total nitrogen (TN) and total phosphorus (TP), gradually aligning with surface water of class III and class IV. In 2012, in Beijing's "Water Pollutant Discharge Standards for Urban Sewage Treatment Plants" (DB 11 / 890-2012), in the A standard for new sewage plants, the TN was raised from 15mg / L of Class A to 10mg / L, and the total pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48C02F101/16C02F101/10
CPCC02F1/488C02F2101/16C02F2101/105
Inventor 许海民韩路毛亚张圣军
Owner JIANGSU QICHUANG ENVIRONMENTAL SCI & TECH