Method for preparing catalytic activity biochar from iron-containing excess sludge and removing antibiotics

A technology of excess sludge and catalytic activity, applied in chemical instruments and methods, catalyst regeneration/reactivation, alkali metal compounds, etc., can solve the problems of complex preparation, high cost, unsatisfactory application effect, etc. The effect of void structure, high specific surface area and good adsorption effect

Pending Publication Date: 2022-03-25
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as in the above-mentioned prior art, most of the existing sludge-based biochar preparation technologies use the sludge produced by conventional urban sewage treatment as the basic raw material, and artificially add iron salts for back-end modification. The preparation is complicated and costly. High, the application effect is not ideal
On the other hand, the existing industrial wastewater treatment generally adopts Fenton oxidation technology, which passes Fe under acidic conditions 2+ Catalytic H 2 o 2 The generation of strong oxidizing hydroxyl radicals (OH) oxidizes the refractory pollutants in wastewater into small molecular organic or inorganic substances, simultaneously producing a large amount of iron-containing excess sludge classified as hazardous waste, and such The treatment and disposal of high-iron sludge is difficult and costly

Method used

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  • Method for preparing catalytic activity biochar from iron-containing excess sludge and removing antibiotics
  • Method for preparing catalytic activity biochar from iron-containing excess sludge and removing antibiotics
  • Method for preparing catalytic activity biochar from iron-containing excess sludge and removing antibiotics

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Effect test

Embodiment 1

[0046] refer to figure 1 , biochar with catalytic activity was prepared by pyrolysis of dehydrated iron-containing excess sludge by the following steps:

[0047] (1) After dehydrating the iron-containing excess sludge in Fenton's sewage treatment process, freeze it for 18 hours at minus 20°C, and then thaw it naturally for 6 hours;

[0048] (2) crushing polystyrene plastic foam with an ultrafine crusher to obtain polystyrene plastic foam particles with a particle size of about 100 microns;

[0049] (3) Fully mix the sieved iron-containing excess sludge with polystyrene foam particles, then place in an oven to dry at 105°C for 4 hours, and pass through a 50-mesh sieve after crushing;

[0050] (4) impregnating and activating the dried mixture with a 3mol / L zinc chloride solution for 24 hours to obtain a biochar preparation precursor mixed with iron-containing residual sludge and polystyrene particles;

[0051] (5) The obtained biochar preparation precursor was heated up to 800...

Embodiment 2

[0055] Use the biological charcoal that embodiment 1 makes to activate peroxodisulfate to degrade sulfamethoxazole, and its steps are as follows:

[0056] (1) Prepare 50 mg / L sulfamethoxazole solution. Since sulfamethoxazole is extremely difficult to dissolve in water, when preparing the solution, first ultrasonicate it in a small amount of deionized water for 5 minutes, then transfer it to a volumetric flask, and then magnetically Stirrer, at the speed of 800rpm / min, stir for 10h to ensure that it is fully dissolved;

[0057] (2) Get the prepared concentration and add 100 mg of potassium peroxodisulfate and 50 mg of biochar into 100 ml of 50 mg / L sulfamethoxazole solution;

[0058] (3) Stir the reaction at a rotating speed of 200rpm / min, take samples every 10min, and utilize high-performance liquid chromatography to quantitatively analyze the content of SMX within 24h.

[0059] The result of high-performance liquid chromatography detection is: the degradation rate of sulfame...

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Abstract

The invention discloses a method for preparing biochar with catalytic activity by utilizing iron-containing excess sludge and a method for removing antibiotics, and belongs to the field of solid waste recycling and carbon material synthesis. The preparation method of the biochar comprises the following steps: carrying out dehydration and freeze thawing treatment on iron-containing excess sludge, mixing with polystyrene particles, dipping and activating with zinc chloride, then carrying out high-temperature pyrolysis in an inert atmosphere, and the like. According to the method for removing the antibiotics, the prepared biochar is adopted to activate peroxydisulfate to construct an advanced oxidation system to degrade typical antibiotics. The prepared biochar has a large specific surface area and a rich pore structure, contains a large number of iron catalytic active sites, has significantly improved efficiency in catalyzing peroxydisulfate to degrade antibiotics compared with the prior art, and has significantly reduced dosages of the biochar and an oxidizing agent. According to the invention, waste recycling can be realized, the purpose of treating waste with waste is achieved, and the method has remarkable environmental, economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of sludge resource utilization, biochar and water pollution prevention and control, in particular to the technical field of preparing biochar by recycling industrial waste and applying it to water pollution prevention and control. Background technique [0002] In the process of municipal sewage treatment and industrial wastewater treatment, a large amount of excess sludge will be produced, which contains a large number of microorganisms and pollutants adsorbed by sludge flocs, especially metal residues caused by the application of metal salts in sewage oxidation and sludge flocculation, such as Fenton oxidation sludge in industrial sewage treatment is even listed as hazardous solid waste. It has become a research hotspot in the field of water treatment to carry out safe and low-cost effective treatment and disposal of such wastes through resource technology. At the same time, as an indispensable drug in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C10B53/00C10B57/00C10B57/10C10B57/06B01J20/20B01J20/30B01J20/28B01J21/18B01J35/10B01J38/02
CPCC02F1/725C02F1/722C10B53/00C10B57/005C10B57/10C10B57/06B01J20/20B01J20/3078B01J20/28061B01J21/18B01J35/1019B01J38/02C02F2305/026
Inventor 刘文宗步胜林王爱杰李西齐张文哲高翔宇葛小利林臻
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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