Preparation method and application of secondary lanthanum carbide modified sludge biochar

A secondary lanthanum carbide and biochar technology, which is applied in the field of functional materials and environmental water treatment, can solve the problems of water eutrophication and achieve the effects of efficient removal, low equipment requirements and wide sources

Inactive Publication Date: 2021-07-23
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of water eutrophication and existing sludge disposal, and provide a preparation method of secondary lanthan

Method used

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  • Preparation method and application of secondary lanthanum carbide modified sludge biochar
  • Preparation method and application of secondary lanthanum carbide modified sludge biochar
  • Preparation method and application of secondary lanthanum carbide modified sludge biochar

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Experimental program
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Effect test

Embodiment 1

[0018] The remaining sludge was dried at 105°C, ground, and sieved; an appropriate amount of sludge powder was placed in a quartz tube furnace, and pyrolyzed at 600°C for 3 hours at a heating rate of 10°C / min to obtain sludge biological charcoal; the obtained sludge biochar and lanthanum nitrate were mixed in a ratio of 1:2 and placed in 40mL ultrapure water, stirred and soaked with a magnetic stirrer at room temperature, left to stand, and dried at 50°C; then the lanthanum was modified Sludge biochar was placed in a quartz tube furnace and pyrolyzed at 600°C for 3 hours at a heating rate of 10°C / min to obtain lanthanum-modified sludge biochar.

[0019] Effect of pH on the adsorption performance of BC-La-BC: Weigh 20 mg of BC-La-BC and place it in 15 mL of phosphate solution with a concentration of 30 mg / L, and adjust the pH with 0.1M HCl and 0.1M NaOH to be 3, 5, 7, 9 and 11, placed in a shaker for 24 hours to achieve adsorption equilibrium. The mixed solution was filtered t...

Embodiment 2

[0021] The remaining sludge was dried at 105°C, ground, and sieved; an appropriate amount of sludge powder was placed in a quartz tube furnace, and pyrolyzed at 600°C for 3 hours at a heating rate of 10°C / min to obtain sludge biological charcoal; the obtained sludge biochar and lanthanum nitrate were mixed in a ratio of 1:2 and placed in 40mL ultrapure water, stirred and soaked with a magnetic stirrer at room temperature, left to stand, and dried at 50°C; then the lanthanum was modified Sludge biochar was placed in a quartz tube furnace and pyrolyzed at 600°C for 3 hours at a heating rate of 10°C / min to obtain lanthanum-modified sludge biochar.

[0022] Determination of dosage: Weigh 4, 8, 10, 15, 20, 25, 30, 40, 50, and 60 mg of BC-La-BC respectively, place them in 15 mL of phosphorus solution with a concentration of 30 mg / L, and adjust the pH Adjusted to 3.0. Such as figure 2 , the adsorption capacity is the largest when the dosage is 10mg.

Embodiment 3

[0024] The remaining sludge was dried at 105°C, ground, and sieved; an appropriate amount of sludge powder was placed in a quartz tube furnace, and pyrolyzed at 600°C for 3 hours at a heating rate of 10°C / min to obtain sludge biological charcoal; the obtained sludge biochar and lanthanum nitrate were mixed in a ratio of 1:2 and placed in 40mL ultrapure water, stirred and soaked with a magnetic stirrer at room temperature, left to stand, and dried at 50°C; then the lanthanum was modified Sludge biochar was placed in a quartz tube furnace and pyrolyzed at 600°C for 3 hours at a heating rate of 10°C / min to obtain lanthanum-modified sludge biochar.

[0025] Put 20 mg of BC-La-BC into a polyethylene centrifuge tube filled with 15 mL of phosphate solution (pH=3), and set the initial phosphorus concentration to 5, 10, 15, 20, 30, 50, 70, 80, 100 , 150, 250, 300 and 400 mg / L, adjust the pH to 3.0, shake the above mixture at 15, 25, 35, 45 and 65 °C for 24 hours to reach adsorption equ...

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Abstract

The invention discloses a preparation method and application of secondary lanthanum carbide modified sludge biochar, belongs to the field of functional materials and environmental water treatment, and is used for removing phosphate in municipal sewage. According to the method, the residual sludge is used as a biochar raw material, and after lanthanum modification, the efficient, economical and environment-friendly adsorbent BC-La-BC is prepared through pyrolysis. When the adding amount of the BC-La-BC is 10mg and the pH value is 3.0, the adsorption capacity is the maximum. In an experiment for removing municipal sewage by using a fixed bed column, the treatment time of 1-2g of BC-La-BC is 2.92-5.08 hours at the flow rate of 5mL/min. The lanthanum modified sludge biochar prepared by the scheme not only recycles residual sludge, but also has relatively strong adsorption capacity on phosphate, and the highest adsorption capacity can reach 131.58 mg/g.

Description

technical field [0001] The invention belongs to the field of functional materials and environmental water treatment, in particular to a preparation method and application of secondary lanthanum carbide modified sludge biochar. Background technique [0002] Phosphorus is an essential element in aquatic ecosystems, but excessive phosphorus discharge can cause serious water eutrophication, threatening ecosystems and human health. Therefore, in order to control water pollution, phosphorus discharge requirements are clearly stipulated. Currently, in the secondary effluent of sewage treatment plants, the maximum allowable phosphorus is 0.5mg / L. Therefore, it is very important to reduce and control the phosphorus content in water bodies. At present, technologies such as enhanced biological phosphorus removal, chemical precipitation, ion exchange, and adsorption are used to remove phosphate in wastewater. Among them, the adsorption method is considered to be a new method because of...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/20B01J20/0207C02F1/283B01J2220/4887C02F2101/105
Inventor 孙晓杰李倩王亚搏张木喜谭知涵张红霞张文杰李海翔
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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