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Magnetically induced crystallization method and apparatus for removal and recovery of phosphorus in wastewater

A technology of induced crystallization and magnetic induction, applied in the fields of magnetic field/electric field water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problem that TP is difficult to meet emission standards at the same time, carbon source contradiction, mud age contradiction and nitric acid Salt problems and other problems, to achieve the effect of easy separation of purity, low cost of raw materials, and improved phosphorus removal and recovery efficiency

Active Publication Date: 2016-05-04
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the simultaneous biological denitrification and biological phosphorus removal sewage biological treatment system, biological denitrification and biological phosphorus removal usually have carbon source conflicts, mud age conflicts and nitrate problems, which makes it difficult for the TP of the effluent to reach the discharge standard at the same time

Method used

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  • Magnetically induced crystallization method and apparatus for removal and recovery of phosphorus in wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Water quality index of sludge dewatering filtrate of a city sewage plant: COD C 660mg / L, NH + 4 -N is 63.08mg / L, NO 3 - -N is 0.5mg / L, and TP is 5.9mg / L. Adopt the inventive method to carry out dephosphorization and recycling, specifically as follows:

[0027] (1) The present invention figure 1 The diameter of the reactor shown is D=0.10m, the effective volume is V=7.0L, and the size is determined according to the scale shown in the figure, the distance between the magnets is L=0.5m, and the angle of the folding plate is ; All dosing, water intake and aeration are regulated and controlled by the controller;

[0028] (2) Use steel slag (particle size 0.01mm~0.2mm) and electrolytic manganese slag (0.05mm~0.30mm) as seeds, the mass ratio of steel slag to electrolytic manganese slag is 0.1, and the dosage should be controlled at 25g / L;

[0029] (3) The magnetic induction intensity is controlled at 40mT.

[0030] (4) Using CaCl 2 As a medicine, the Ca / P molar ratio ...

Embodiment 2

[0034] Nitrification sludge dehydration liquid of a city sewage plant: COD C 1200mg / LL, NH + 4 -N is 280.6mg / L, NO 3 - -N is 0.05mg / L, and TP is 90.0mg / L. Adopt the inventive method to carry out dephosphorization and recovery test, specifically as follows:

[0035] (1) The present invention figure 1 The diameter of the reactor shown is D=0.10m, the effective volume is V=7.0L, the distance between the magnets is L=0.5m, and the angle of the folding plate is ; All dosing, water intake and aeration are regulated and controlled by the controller;

[0036] (2) Use steel slag (particle size 0.01mm~0.2mm) and electrolytic manganese slag (0.05mm~0.30mm) as crystal seeds, the mass ratio of steel slag to electrolytic manganese slag is 0.1, and the dosage is controlled at 40g / L;

[0037] (3) The magnetic induction intensity is controlled at 60mT.

[0038] (4) Using CaCl 2 and MgCl 2 As a medicament, the molar ratio of the two medicaments is 4:6, and the converted Ca / P molar rat...

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Abstract

The invention discloses a magnetically induced crystallization method and apparatus for removal and recovery of phosphorus in wastewater. A magnetically induced crystallization reaction apparatus comprises a reactor, a drug restore tank, a water tank and a blower. The reactor comprises a mixing zone, a reaction zone and a settling zone. A flap mixing apparatus is arranged in the mixing zone to lay a good foundation for the induction crystallization reaction; porous alkaline slag rich in Ca<2+> and electrolytic manganese slag are used as a composite induction seed to create a favorable conditions for the induction crystallization reaction; a magnetic field is added, and the magnetic force is favor of OH. generation, thereby promoting crystal growth; and magnetic force and iron in composite seed form a magnetic flocculation effect, thereby improving the separation effect of crystals and water, and improving the efficiency of phosphorus removal. The invention does not change the process of the wastewater treatment plant in the prior art, removes and recycles phosphorus in sludge dewatering filtrate and sludge nitrification liquid, has the advantages of simple equipment, simple operation, and simple control, and is conducive to production implementation.

Description

technical field [0001] The invention relates to the removal and recycling of phosphorus in sewage, in particular to a method and device for removing and recycling phosphorus in sludge dewatering filtrate by magnetically induced crystallization. Background technique [0002] Research and development of new high-efficiency phosphorus removal technology and process is one of the research hotspots in the field of sewage treatment today. In the simultaneous biological denitrification and biological phosphorus removal sewage biological treatment system, biological denitrification and biological phosphorus removal usually have carbon source contradictions, mud age contradictions and nitrate problems, which makes it difficult for the TP of the effluent to meet the discharge standards at the same time. Phosphorus is a non-renewable resource. In order to make it sustainable and recyclable, relevant scholars at home and abroad have changed their research perspective from removing phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48C02F1/58
CPCC02F1/488C02F1/58C02F2101/105
Inventor 邓仁健朱国成王政华
Owner HUNAN UNIV OF SCI & TECH
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