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Phosphorus-removing method based on nano-grade iron

A technology of nano-iron and limonite, which is applied in the fields of chemical instruments and methods, water/sludge/sewage treatment, adsorption water/sewage treatment, etc. It can solve the problems of undeveloped phosphorus removal materials, limited adsorption capacity, low adsorption capacity, etc. problems, to achieve the effect of abundant reserves, large adsorption capacity and high treatment efficiency

Inactive Publication Date: 2013-05-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Adsorption is generally used for advanced treatment of trace amounts of phosphorus in water. The current problem is that the adsorption capacity of phosphorus removal adsorbents for low concentrations of phosphorus is low, and cheap and efficient adsorption and removal of phosphorus materials are still to be developed.
[0004] Although the above adsorption materials are economically cheaper than the use of precipitants and flocculants to a certain extent, the adsorption mechanism itself limits its adsorption capacity, and there are still deficiencies in deep phosphorus removal.

Method used

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  • Phosphorus-removing method based on nano-grade iron
  • Phosphorus-removing method based on nano-grade iron
  • Phosphorus-removing method based on nano-grade iron

Examples

Experimental program
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Embodiment 1

[0028] The preparation method of nano-iron in this example: select limonite ore with a goethite content of 70%, crush the ore, and sieve to obtain a sample of 0.25-0.5 mm, roast it in a hydrogen atmosphere at a temperature of 550 ° C for 3 hours, and then Cool to room temperature under a nitrogen atmosphere, take it out and seal it for storage to obtain nano-iron. The amount of feeding hydrogen is calculated according to 100-150% of the theoretical dosage for reducing ferric iron to zero-valent iron.

[0029] Water treatment method: fill the prepared material into a test column with a diameter of 12mm and a height of 60mm, and the effective height of the filler is 30mm. Prepare simulated phosphorous-containing wastewater with a phosphorus concentration of 5mg / L and a pH of 6.8, and operate with a hydraulic retention time of 1.5 hours. The phosphorus concentration in the effluent is kept below 0.1mg / L, the phosphorus removal rate is higher than 98%, and the phosphorus concentra...

Embodiment 2

[0032] This is an example of the preparation method of nano-iron: select limonite ore with a goethite content of 90%, crush the ore, and sieve to obtain a sample of 0.25-0.5 mm, roast it in a carbon monoxide atmosphere at 700 ° C for 3 hours, and then dry it under nitrogen. Cool to room temperature under the atmosphere, take it out and seal it for storage, and obtain nano-iron. The amount of feeding carbon monoxide is calculated according to 100-150% of the theoretical dosage for reducing ferric iron to zero-valent iron.

[0033] Water treatment method: fill the prepared material into a test column with a diameter of 12mm and a height of 60mm, and the effective height of the filler is 30mm. Prepare simulated phosphorous-containing wastewater with a phosphorus concentration of 5mg / L and a pH of 4.2, and operate it with a hydraulic retention time of 3 hours. The phosphorus concentration in the effluent is kept below 0.1mg / L, the phosphorus removal rate is higher than 98%, and th...

Embodiment 3

[0035] Water treatment method: put the material prepared in Example 1 into an experimental column with a diameter of 12 mm and a height of 60 mm, and the effective height of the filler is 30 mm. Prepare simulated phosphorus-containing wastewater with a phosphorus concentration of 2 mg / L and a pH of 6.8, and operate with a hydraulic retention time of 1.5 hours. The phosphorus concentration in the effluent is kept below 0.02mg / L, the phosphorus removal rate is higher than 98%, and the phosphorus concentration in the effluent reaches the first-class standard for surface water bodies.

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Abstract

The invention discloses a phosphorus-removing method based on nano-grade iron. The nano-grade iron is prepared by reducing crushed goethite (0.1-5mm) by using hydrogen or carbon monoxide under an environmental temperature of 500-700 DEG C. A phosphorus-removing principle is that: the nano-grade iron obtained by the reduction of goethite releases Fe<3+> under the effects of water and dissolved oxygen; Fe<3+> and PO4<3-> forms FePO4 precipitate; and trace phosphorous in water is removed. With the method provided by the invention, phosphorous-containing wastewater can be effectively purified, and especially a deep phosphorus-removing effect can be provided.

Description

1. Technical field [0001] The invention relates to a material and an application method for deep water dephosphorization treatment, in particular to a material for deep dephosphorization of domestic sewage and eutrophic water body and an application method thereof. 2. Background technology [0002] With the aggravation of water pollution, eutrophication has generally occurred in surface water bodies in my country. This requires more stringent phosphorus removal treatment of sewage. Domestic sewage and industrial wastewater generally use biological treatment processes to reduce the phosphorus concentration in the drainage. Even if the treated secondary effluent reaches the first-level A standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002, the phosphorus concentration in it is still at 0.3-0.5mg / L, which is 12-25 times the standard phosphorus concentration of the second-class lakes and reservoirs in the "Environmental Quality Standards f...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/58B01J20/02B01J20/30
Inventor 刘海波陈天虎邹雪华李平谢晶晶
Owner HEFEI UNIV OF TECH
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