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A kind of high-efficiency phosphorus removal biochar and its preparation method and application

A biochar, high-efficiency technology, applied in chemical instruments and methods, water pollutants, by-product vaporization, etc., can solve the problem of incomplete treatment of excess sludge, achieve resource utilization, reduce energy consumption, and enhance processing capacity Effect

Active Publication Date: 2020-04-28
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method provided by the invention makes full use of the characteristics of high biomass content in the excess sludge, and converts it into a high-efficiency adsorbent that can treat phosphorus-containing wastewater, realizes the resource utilization of waste, and solves the residual sludge in the traditional method. Solve the problem of incomplete sludge treatment, and at the same time obtain an environmentally friendly product with economic value; the obtained phosphorus removal biochar has a strong ability to adsorb phosphate, the removal rate of phosphate is above 95%, and the adsorption capacity is above 91mg / g

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example provides a high-efficiency phosphorus removal biochar, which is prepared through the following process.

[0044] a. Mix ultrafine dolomite powder and coal powder according to the mass ratio of 1:1, and then add the mixture according to the ratio of 1:10 to the remaining sludge dry weight ratio to a water content of 90-95 % of the remaining sludge, start the ultrasonic device, vibrate for 1 to 2 hours, and then filter and dry.

[0045] b. Put the solid dried in step a into the heating section of the tube furnace for pyrolysis, using N 2 As a protective gas, the pyrolysis temperature was controlled at 800°C and the pyrolysis time was 3h. After the pyrolysis is completed, the solid is taken out, cooled to room temperature, and washed 5 to 6 times with deionized water to remove impurities.

[0046] c. Add the cleaned solid in step b to 0.1 mol / L lanthanum chloride solution (100 mL), and after ultrasonic vibration treatment for 8 hours, filter and dry, dry and...

Embodiment 2

[0050] This example provides a high-efficiency phosphorus removal biochar, which is prepared through the following process.

[0051] a. Mix ultrafine dolomite powder and coal powder according to the mass ratio of 1:1.2, and then add the mixture according to the ratio of 1:15 to the remaining sludge dry basis weight ratio to a water content of 90-95 % of the remaining sludge, start the ultrasonic device, shake for 2 hours and then filter and dry.

[0052] b. Put the solid dried in step a into the heating section of the tube furnace for pyrolysis, using N 2 As a protective gas, the pyrolysis temperature is controlled at 700°C and the pyrolysis time is 2.5h. After the pyrolysis is completed, the solid is taken out, cooled to room temperature, and washed 5 to 6 times with deionized water to remove impurities.

[0053] c. Add the cleaned solid in step b to 0.1 mol / L lanthanum chloride solution (100 mL), and after ultrasonic vibration treatment for 7 hours, filter and dry, dry and...

Embodiment 3

[0057] This example provides a high-efficiency phosphorus removal biochar, which is prepared through the following process.

[0058] a. Mix ultrafine dolomite powder and coal powder according to the ratio of mass ratio of 1:1.5, and then add the mixture according to the ratio of 1:12 to the dry weight ratio of the remaining sludge until the water content is 90-95 % of the remaining sludge, start the ultrasonic device, shake for 2 hours and then filter and dry.

[0059] b. Put the solid dried in step a into the heating section of the tube furnace for pyrolysis, using N 2 As a protective gas, the pyrolysis temperature is controlled at 900°C and the pyrolysis time is 2.5h. After the pyrolysis is completed, the solid is taken out, cooled to room temperature, and washed 5 to 6 times with deionized water to remove impurities.

[0060] c. Add the cleaned solid in step b into 0.1 mol / L lanthanum chloride solution (100 mL), and after ultrasonic vibration treatment for 8 hours, filter...

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Abstract

The invention relates to high-efficiency phosphorus removal biochar, a preparation method and an application thereof. The preparation method includes the following steps: S1. mixing dolomite powder and pulverized coal to obtain a mixture, then adding the mixture into surplus sludge, shaking, filtering and drying to obtain a solid; S2. pyrolyzing and cleaning the solid at 600-1000 DEG C; and S3. adding the cleaned solid into a rare earth metal salt solution, shaking, filtering and drying to obtain the high-efficiency phosphorus removal biochar. The preparation method fully utilizes the characteristic of high biomass content in surplus sludge, converts the surplus sludge into a high-efficiency adsorbent capable of treating phosphorus-containing wastewater, realizes resource utilization of waste, solves the problem of incomplete treatment of surplus sludge in the traditional method, and simultaneously obtains an environment-friendly product with economic value; and the obtained phosphorusremoval biochar has strong phosphate adsorption capacity, with the phosphate removal rate being above 95%, and the adsorption capacity being above 91mg / g.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a high-efficiency phosphorus removal biochar and its preparation method and application. Background technique [0002] At present, the process of urban development is accelerating, and many sewage treatment plants have been newly built or expanded to meet the needs. With the increasing sewage treatment volume and higher standard sewage treatment rate, the level of sewage treatment has been significantly improved. As a widely used treatment technology at present, the activated sludge method also produces a large amount of excess sludge while treating sewage. There are heavy metal elements, various pathogenic bacteria and pathogenic microorganisms, often have a pungent and foul smell, and the chemical properties are extremely unstable. If not properly handled, it will cause serious environmental pollution problems. At present, the commonly used surplus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F11/10C02F101/10
CPCB01J20/041B01J20/20C02F1/281C02F1/283C02F1/288C02F11/10C02F2101/105Y02W10/40
Inventor 黄海明李晶赵宁
Owner DONGGUAN UNIV OF TECH
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