Preparation method and application of lanthanum-loaded modified bentonite dephosphorization material

A bentonite and modified technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of low biological phosphorus removal efficiency, potential safety hazards of raw materials, and low phosphorus removal efficiency, etc. Good phosphorus removal effect, low cost and simple treatment process

Inactive Publication Date: 2019-07-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common sewage phosphorus removal methods mainly include chemical methods and biological methods. Among them, the cost of chemical phosphorus removal is relatively high, and the efficiency of biological phosphorus removal is low. ) level A discharge standard, chemical assisted biological phosphorus removal is the main method of sewage plant
At present, the chemicals widely used in the process of chemically assisted biological phosphorus removal in sewage plants include aluminum-iron flocculants and calcium oxide.
However, the method for preparing lanthanum-loaded phosphorus removal materials in the prior art has many steps and a long preparation process, and the preparation often involves raw materials that are likely to pollute the environment such as acid liquid and ammonia water, and the storage and transportation of the raw materials have relatively high safety hazards. Many, higher requirements for equipment

Method used

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  • Preparation method and application of lanthanum-loaded modified bentonite dephosphorization material
  • Preparation method and application of lanthanum-loaded modified bentonite dephosphorization material
  • Preparation method and application of lanthanum-loaded modified bentonite dephosphorization material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Single factor experiment of solid-liquid ratio of lanthanum modified bentonite

[0026] Material preparation: use 10, 20, 40, 60, 80mL 0.1mol / L LaCl respectively 3 Adjust the pH of the solution to 10 with 1mol / L NaOH in an ultrasonic cleaner and disperse it evenly by ultrasonication for 2 minutes, add 1.5g of bentonite and ultrasonic for 40 minutes, filter, wash, and dry at 105°C.

[0027] Adsorption test: Add 0.04g (1g / L) material to 40mL potassium dihydrogen phosphate solution with a concentration of 50mg / L, adsorb in an air shaker at 150rpm and 25°C for 1h, and measure the residual phosphorus concentration in the supernatant.

[0028] The mass ratio of table 1 bentonite and lanthanum chloride

[0029]

[0030] The adsorption capacity at high phosphorus concentration and low phosphorus concentration is as shown in the attached figure 2 .

Embodiment 2

[0032] Lanthanum concentration single factor experiment

[0033] Material preparation: 40mL 0.01, 0.05, 0.1, 0.15, 0.2mol / L LaCl 3 Adjust the pH of the solution to 10 with 1mol / L NaOH in an ultrasonic cleaner and disperse it evenly by ultrasonication for 2 minutes. Add 3g of bentonite and ultrasonic for 40 minutes, filter, wash, and dry at 105°C.

[0034] Adsorption test: Add 0.04g (1g / L) material to 40mL potassium dihydrogen phosphate solution with a concentration of 50mg / L, adsorb in an air shaker at 150rpm and 25°C for 1h, and measure the residual phosphorus concentration in the supernatant. The test data is shown in Table 2, and the line graph drawn is as follows image 3 .

[0035] Phosphorus removal effect of different lanthanum chloride concentrations in table 2

[0036]

Embodiment 3

[0038] Ultrasonic time single factor experiment

[0039] Material preparation: 40mL 0.1mol / L LaCl 3 Adjust the pH of the solution to 10 with 1mol / L NaOH in an ultrasonic cleaner and disperse it evenly by ultrasonication for 2min. Add 3g of bentonite and ultrasonicate for 3, 5, 10, 20, and 40min respectively, filter, wash, and dry at 105°C.

[0040] Adsorption test: Add 0.04g (1g / L) material to 40mL potassium dihydrogen phosphate solution with a concentration of 50mg / L, adsorb in an air shaker at 150rpm and 25°C for 1h, and measure the residual phosphorus concentration in the supernatant. The experimental data are shown in Table 3, and the line graph drawn is as follows Figure 4 .

[0041] Table 3 Phosphorus removal effect of different ultrasonic time

[0042]

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Abstract

The invention discloses a preparation method of a lanthanum-loaded modified bentonite dephosphorization material. The preparation method comprises the steps as follows: performing ultrasonic treatmenton a lanthanum chloride solution in an alkaline environment, mixing the treated solution with bentonite, then, performing stirring and ultrasonic treatment, and finally, performing cleaning, filtration, grinding and sieving to obtain the lanthanum-loaded modified bentonite dephosphorization material. Compared with the prior art, the method has the advantages that selected raw materials are sufficient, natural, non-toxic, convenient to use and low in cost, the treatment process is simple, the treatment cost is lower, used raw materials are environment-friendly materials, secondary pollution isavoided, and meanwhile, the preparation time is obviously shortened. The dephosphorization material prepared with the preparation method of the lanthanum-loaded modified bentonite dephosphorization material has the phosphorus removal rate up to 90% or above and has characteristics of high efficiency, controllability and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection treatment, and relates to a modified bentonite material and a preparation and use method thereof. Background technique [0002] As the country continues to strengthen the control of water eutrophication, the control of phosphorus content in sewage discharge is becoming more and more stringent. Common sewage phosphorus removal methods mainly include chemical methods and biological methods. Among them, the cost of chemical phosphorus removal is relatively high, and the efficiency of biological phosphorus removal is low. ) Class A discharge standard, chemical-assisted biological phosphorus removal is the main method of sewage treatment plants. At present, the chemicals widely used in the process of chemically assisted biological phosphorus removal in sewage plants include aluminum-iron flocculants and calcium oxide. In addition, aluminum and iron flocculants will corrode the dosing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/12C02F1/281C02F2101/105
Inventor 陆谢娟颜瑞陈慧童山原吴晓晖章北平
Owner HUAZHONG UNIV OF SCI & TECH
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