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Preparation method of chemical adsorption material for removing phosphorus containing substances in wastewater

A chemical adsorption and material technology, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve the problems of insufficient direct reaction, secondary pollution, high water content, etc., to avoid co-sedimentation, and solve a large amount of sludge generation , the effect of avoiding ammonia nitrogen pollution

Inactive Publication Date: 2012-11-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that the direct reaction of the traditional chemical precipitation phosphorus removal method is not sufficient, and excessive magnesium ions and ammonium ions need to be introduced, resulting in a large amount of generated sludge, high water content, and easy secondary pollution. Preparation and application method of chemical adsorption material for phosphorus-containing substances in wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] First crush the magnesite, decompose it with nitric acid, and generate a magnesium nitrate solution; then add ammonia water to the above solution, and continuously feed CO2 gas to generate a yellow-white precipitate, filter it, and obtain a filter residue; then put the obtained filter residue in an ultrasonic Respectively wash three times repeatedly with squalane and oxymalononitrile under action; Then add and filter residue mass ratio is respectively 5% polyepichlorohydrin, 10% polytetrafluoroethylene and 1% For p-benzenesulfonyl hydrazide, mix well, and use it overnight; then cook the above-mentioned prepared mixture at a pressure of 1.5MPa and a temperature of 75°C for 1 hour; Release under reduced pressure under certain conditions to obtain a fluffy porous white substance, which is the phosphorus chemical adsorption material.

[0027] application method

[0028] First put the adsorption material as a filler into the adsorption tower, first let the wastewater contai...

example 2

[0030] First crush the magnesite and decompose it with nitric acid to generate a magnesium nitrate solution; then add ammonia water to the above solution and continuously feed CO 2 Gas, generate yellow-white precipitate, filter to obtain filter residue; then the obtained filter residue is washed three times with squalane and oxymalononitrile under the action of ultrasonic waves; 6% of polyepichlorohydrin, 15% of polytetrafluoroethylene and 2% of p-benzenesulfonyl hydrazide, mixed evenly, and used overnight; Cook at 85°C for 2 hours; finally, after cooking, release under reduced pressure at a vacuum of 0.03MPa and normal temperature to obtain a fluffy, porous white substance, which is the phosphorus chemical adsorption material.

[0031] application method

[0032] First put the adsorption material as filler into the adsorption tower, first let the wastewater containing high concentration of ammonia nitrogen flow through to obtain the adsorbent adsorbed with ammonia nitrogen; ...

example 3

[0034] First crush the magnesite and decompose it with nitric acid to generate a magnesium nitrate solution; then add ammonia water to the above solution and continuously feed CO 2 Gas, generate yellow-white precipitate, filter to obtain filter residue; then the obtained filter residue is washed three times with squalane and oxymalononitrile under the action of ultrasonic waves; 5% of polyepichlorohydrin, 13% of polytetrafluoroethylene and 2% of p-benzenesulfonyl hydrazide, mixed evenly, and used overnight; Cook at 80°C for 1.5 hours; finally, after cooking, release under reduced pressure at a vacuum of 0.02MPa and normal temperature to obtain a fluffy, porous white substance, which is the phosphorus chemical adsorption material.

[0035] application method

[0036] First put the adsorption material as a filler into the adsorption tower, first let the wastewater containing high concentration of ammonia nitrogen flow through, and obtain the adsorbent adsorbed with ammonia nitr...

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Abstract

The invention relates to a preparation method of a chemical adsorption material for removing phosphorus containing substances in wastewater, and belongs to the field of wastewater treatment. The preparation method includes the steps: firstly, grinding magnesite into powder and generating deposits after acid washing and alkaline leaching; mixing the deposits with 3-4% of polymerized organic polyacrylonitrile, 15-20% of polycaprolactam and 3-4% of diammonium nitrogen-based benzene solution of foaming agents; and generating the adsorption material with free Mg2+ under the pressure of 2.0-3.0MPa and at the temperature of 90-100 DEG C. Firstly, the adsorption material is soaked by phosphoric acid and then placed into an adsorption tower by serving as packing; secondly, the wastewater containing ammonium ions flows through the adsorption tower and chemically reacts with the adsorption material in the packing tower; and finally, white crystalline magnesium ammonium phosphate is generated. The influence of side reaction is avoided by the adsorption material, phosphate deposits with high purity are obtained, and secondary pollution caused by a traditional precipitation method is avoided.

Description

technical field [0001] The invention relates to a preparation method of a chemical adsorption material for removing phosphorus-containing substances in waste water, belonging to the field of waste water treatment. Background technique [0002] Generally, chemical precipitation is used to remove phosphorus, which is to produce magnesium ammonium phosphate precipitation. Magnesium salt and ammonium ions need to be added. Due to the presence of other ions in the wastewater, this reduces the collision probability of direct reaction ions, resulting in quasi-equilibrium of tiny precipitated particles, resulting in The apparent solubility product is much higher than the real solubility product. In order to achieve the conditions for the formation of phosphate precipitation, the concentration of the metal ion precipitant that needs to be added is often 1-2 orders of magnitude higher than the normal solubility product. Therefore, the cost of the agent is high. As a result, the concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/04B01J20/34C02F1/28C02F1/58C01B25/45
Inventor 陈毅忠包铠
Owner CHANGZHOU UNIV
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