Material and method for removing phosphorus in water

A technology for removing water and filtering materials, used in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc. The effect of long and large phosphorus removal capacity

Inactive Publication Date: 2016-07-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adsorption materials modified with rare earth elements have high phosphorus removal efficiency, but are expensive and have little prospect for popularization and application
Inexpensive and efficient adsorbents for phosphorus removal are still to be developed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select light-burned magnesia produced in a certain place as A raw material, wherein the magnesia content is greater than 85%, crush and sieve to obtain 1-3mm particle A;

[0019] Select natural gypsum as raw material B, wherein the content of calcium sulfate is greater than 85%, crush and sieve to obtain 1-3mm particle B;

[0020] Mix the particles of AB and AB evenly according to the mass ratio of 1:2 to obtain the filter material specially used for removing phosphorus in water

[0021] The phosphorus removal material is packed in a simulated water treatment column with a height of Ф30cm and a height of 100mm. The phosphorus-containing water to be treated is prepared with tap water (phosphorus concentration 1mg / L), and is treated by upflow filtration. The hydraulic retention time is 40min. Phosphorus concentration meets the standard for Class IV surface water bodies.

Embodiment 2

[0023] Select light-burned magnesia produced in a certain place as A raw material, wherein the magnesia content is greater than 85%, crush and grind through a 200-mesh sieve to obtain powder A;

[0024] Select natural gypsum as raw material B, wherein the content of calcium sulfate is greater than 85%, crush and grind through a 200-mesh sieve to obtain powder B;

[0025] Mix the two powders of A and B evenly according to the mass ratio of 1:1, add water to the ball forming tray to form 3-6mm particles, put them in a sealed container and maintain them at room temperature and saturated humidity for 10 days, and then you can get the special powder. Filter material for removing phosphorus from water.

[0026] Pack the phosphorus removal material into a simulated water treatment column with a height of Ф30cm and a height of 100mm. The phosphorus-containing water to be treated is prepared with tap water (phosphorus concentration 1mg / L), and is treated by upflow filtration. The hydra...

Embodiment 3

[0028] Select light-burned magnesia produced in a certain place as A raw material, wherein the magnesia content is greater than 85%, crush and grind through a 200-mesh sieve to obtain powder A;

[0029] Select desulfurized gypsum as the raw material of B, wherein the content of calcium sulfate is greater than 85%, calcined at 200°C for 1 hour, convert it into plaster of paris, and grind it through a 200-mesh sieve to obtain powder B;

[0030] Mix the two powders of A and B evenly according to the mass ratio of 1:2, add water to the ball forming tray to form 3-6mm particles, and maintain them at room temperature and saturated humidity for 10 days, that is, the special powder for removing phosphorus in water can be obtained. filter material.

[0031] Pack the phosphorus removal material into a simulated water treatment column with a height of Ф30cm and a height of 100mm. The phosphorus-containing water to be treated is prepared with tap water (phosphorus concentration 1mg / L), an...

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Abstract

The invention discloses a material and method for removing phosphorus in water.The material is characterized in that magnesium oxide or magnesium hydrate and calcium sulfate are prepared into particles, the particles are mixed according to the mass ratio of 2:1 to 1:4 to form a dephosphorization filter material, or powder of the two raw materials is mixed according to the mass ratio of 2:1 to 1:4 to be formed, and the material for removing phosphorus is obtained.The material slowly releases calcium ions and hydroxide groups as an activated filter material, and acts with phosphorus in the water to form hydroxyapatite sediment, micro phosphate in the water can be removed, and the phosphorus concentration of effluent reaches four kinds of ground water standards.

Description

1. Technical field [0001] The invention relates to the removal of domestic sewage and surface water phosphorus. 2. Background technology [0002] With the aggravation of water pollution, eutrophication has generally occurred in surface water bodies in my country. The state has set up a major special project for water pollution control to conduct research, invested huge sums of money in the construction of urban sewage treatment facilities, and improved the treatment rate of urban domestic sewage. However, at present, the aerobic activated sludge process is generally used in the treatment of urban domestic sewage, but the concentrations of total nitrogen and total phosphorus in the effluent water of aerobic biological treatment still reach 20-35 mg / L and 0.3-3.0 mg / L respectively, which are the main factors for lake water. 10-50 times of the second standard. In many cases, it is difficult for domestic sewage to meet the national first-class A discharge standard after second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F1/58
CPCB01J20/12B01J20/04C02F1/288
Inventor 程鹏陈天虎谢晶晶庆承松
Owner HEFEI UNIV OF TECH
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