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Modified steel slags for removing phosphorus in domestic sewage and preparation method and application thereof

A technology of domestic sewage and steel slag, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of low phosphorus removal efficiency, achieve abundant supply, simple operation, and no secondary pollution Effect

Inactive Publication Date: 2018-08-17
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the purposes of the present invention is to provide a modified steel slag for removing phosphorus in domestic sewage,

Method used

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  • Modified steel slags for removing phosphorus in domestic sewage and preparation method and application thereof
  • Modified steel slags for removing phosphorus in domestic sewage and preparation method and application thereof
  • Modified steel slags for removing phosphorus in domestic sewage and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A modified steel slag for removing phosphorus in domestic sewage, the preparation method is as follows:

[0025] 1) The steel slag is taken from the converter steel slag of Laiwu Steelmaking Plant. Use a jaw crusher to crush all the steel slag, sieve it with a 30-40 mesh screen, and take out the sieve.

[0026] 2) The sieved steel slag is activated in an SX2-4-13 high-temperature resistance furnace at 800°C for 1.5 hours and then cooled to room temperature to obtain activated steel slag.

[0027] 3) Take 50g of activated steel slag and 5g of lime and mix it evenly, add 11mL of distilled water, stir evenly, put it in a hydrothermal reactor, and react hydrothermally at 185°C for 6h.

[0028] 4) After the hydrothermal product is repeatedly washed with distilled water for 3-5 times, it is dried in a GZX-9140MBE blast drying oven at 80°C to obtain modified steel slag.

Embodiment 2

[0030] Research on the treatment effect of steel slag before and after modification on domestic wastewater under different conditions. The experimental water was selected from domestic sewage in a certain area of ​​Laiwu. The phosphorus concentration in the domestic sewage was 10.4 mg / L and the pH was 7.69.

[0031] (1) The influence of steel slag dosage on phosphorus removal effect

[0032] Take 100mL of phosphorus-containing domestic sewage with a mass concentration of 10.4mg / L in five 250mL conical flasks, and then take 0.5g, 1g, 1.5g, 2g, 2.5g of steel slag before modification and mix in the conical flask. Then take another 100 mL of phosphorus-containing domestic sewage with a mass concentration of 10.4 mg / L in five 250 mL conical flasks, and take 0.5 g, 1 g, 1.5 g, 2 g, and 2.5 g of the modified steel slag prepared in Example 1 in a cone. Mix in the bottle. Place it on a shaker and oscillate for 15 minutes at a rotation speed of 150r / min. The phosphorus removal effect of s...

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Abstract

The invention relates to modified steel slags for removing phosphorus in domestic sewage and a preparation method and application thereof. Firstly, steel slags are totally crushed; steel slags with the specification of 30 to 40 meshes are screened out; after being subjected to high-temperature activation for 1 to 2h under the condition of a temperature of 750 to 850 DEG C, the steel slags are cooled to the room temperature; then the high-temperature activated steel slags are mixed with lime according to a mass ratio of 10:1; then water is added according to a mass ratio of the steel slag and lime solid to the water of 5:1; after uniform stirring is carried out, the steel slags are placed into a hydrothermal reactor to perform a hydrothermal reaction for 6 to 7h at a temperature of 180 to 190 DEG C; a hydrothermal product is repeatedly flushed for 3 to 5 times by distilled water and is dried at a temperature of 80 DEG C. Before wastewater is treated, pH of the domestic sewage is regulated to 5.8 to 6.7 or 7.3 to 8.2, the use amount of the steel slags is 1.5g/100mL, adsorption time is 20min, and the removal rate is 98% and above. According to the invention, the steel slags not only can be effectively utilized, but also have the characteristics of high phosphorus removal efficiency and low cost, and show a better industrial application prospect.

Description

Technical field [0001] The invention relates to the preparation and application of modified steel slag for removing phosphorus in domestic sewage, and belongs to the field of solid waste resource reuse and phosphorus-containing wastewater treatment. Background technique [0002] In recent years, the problem of water pollution has become more and more serious. The random discharge of sewage with excessive phosphorus can lead to eutrophication of water bodies. Long-term drinking of phosphorus-containing water can cause osteoporosis and osteonecrosis of the mandible. Therefore, controlling the concentration of phosphorus in water bodies is an important part of protecting water resources and the water environment. At present, the commonly used methods of phosphorus removal mainly include chemical precipitation, biological phosphorus removal, ion exchange, adsorption, and membrane separation. Among them, the addition of chemical precipitants will cause the pH of wastewater to rise, a...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/08B01J20/04B01J20/10B01J20/30C02F1/28C02F1/52C02F101/10
CPCB01J20/06B01J20/041B01J20/08B01J20/103C02F1/281C02F1/5236C02F2101/105
Inventor 包红旭吕志忠鞠政楠张欣苏弘治张馨月李良玉黄颖芝杨雨萌陈阳刘唯玉张浩杨华隋然
Owner LIAONING UNIVERSITY