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Preparation method and application of carbon-based catalyst from excess sluge

A carbon-based catalyst and excess sludge technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve secondary pollution carbon nanotube activation costs, poor disinfection effect, activation energy consumption Advanced problems, to achieve the effect of improving biochar performance, strong adsorption and catalytic performance, and large specific surface area

Active Publication Date: 2021-08-06
HARBIN INST OF TECH
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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 problem that the existing use of peracetic acid to disinfect water is poor, the energy consumption of peracetic acid activation by radiation is high, the activation of metal ions is easy to cause secondary pollution and the cost of activation of carbon nanotubes is relatively high to provide a method for preparing carbon-based catalysts from excess sludge and its application

Method used

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  • Preparation method and application of carbon-based catalyst from excess sluge
  • Preparation method and application of carbon-based catalyst from excess sluge
  • Preparation method and application of carbon-based catalyst from excess sluge

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specific Embodiment approach 1

[0023] Specific embodiment one: In this embodiment, a method for preparing carbon-based catalysts from excess sludge is completed in the following steps:

[0024] 1. Dehydration: Dewater the excess sludge to obtain the dehydrated excess sludge;

[0025] 2. Drying: drying the remaining sludge after dehydration to obtain the remaining sludge after drying;

[0026] 3. Activated sludge: use the chemical activation method to activate the residual sludge after drying to obtain activated residual sludge;

[0027] 4. Introducing transition metals into the activated residual sludge by loading, blending or hydrothermal method;

[0028] The transition metal described in step 4 is Fe, Mn or Co;

[0029] 5. Washing and drying: use deionized water to wash the excess sludge introduced with transition metals, and then dry to obtain a carbon-based catalyst;

[0030] The number of times of washing in step 5 is 3 to 5 times, the drying temperature is 50°C to 70°C, and the drying time is 6h to...

specific Embodiment approach 2

[0031] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the excess sludge described in step 1 is a mixture of one or both of the excess sludge in the primary settling tank and the excess sludge in the secondary settling tank; The dehydration described in step 1 is centrifuged at a centrifugal speed of 3000r / min~5000r / min for 10min~20min; Dry in a drying oven for 6h to 8h. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the specific process of the chemical activation method described in step three is: the residual sludge after drying and the activator are mixed according to the mass ratio of 1 : (1-10) mixed, then ground evenly, placed in a tube furnace, under the protection of nitrogen with a gas flow rate of 200mL / min, heated to 650-850°C at a rate of 5°C / min, and then activated at a constant temperature for 1h ~3h, naturally cooled to room temperature to obtain the product after activation treatment; use hydrochloric acid to pickle the product after activation treatment for 3h~12h to obtain the remaining sludge after activation; the mass fraction of the hydrochloric acid is 37%; the The activator mentioned is ZnCl 2 , KOH, NaOH, K 2 CO 3 and KHCO 3 one or more of. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method and application of a carbon-based catalyst from excess sluge, relates to a preparation method and application of the carbon-based catalyst from excess sludge, and aims to solve the problems of poor disinfection effect of water by using peracetic acid, high energy consumption of activating peracetic acid by using radiation, easy secondary pollution caused by metal ion activation and high cost of carbon nanotube activation in the prior art. The preparation method of the carbon-based catalyst from the excess sludge comprises the following steps: 1, dehydrating; 2, drying; 3, activating the sludge; 4, introducing transition metal; and 5, washing and drying. The carbon-based catalyst is used for activating peroxyacetic acid to degrade organic pollutants in water. The method is suitable for degrading organic matters in water.

Description

technical field [0001] The invention relates to a method and application of a carbon-based catalyst. Background technique [0002] With the development of urbanization and the improvement of industrial technology, more and more refractory organic pollutants enter the water system, causing potential adverse effects on ecosystems and human health, leading to serious environmental problems. Therefore, how to efficiently degrade organic pollutants has become a research hotspot. Among them, advanced oxidation technology is one of the effective means to deal with refractory organic pollutants, which has the characteristics of strong oxidation ability, high reaction efficiency and good degradation effect. The advanced oxidation technology based on the activation of peracetic acid is a current research hotspot. [0003] Peracetic acid is an organic peroxyacid that can be hydrolyzed in fresh water and wastewater to decompose into acetic acid and hydrogen peroxide. It is currently u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J37/08B01J37/02C02F1/72C02F101/36C02F101/34
CPCB01J23/75B01J23/002B01J37/082B01J37/0207B01J37/088C02F1/722C02F1/725C02F2101/36C02F2101/345C02F2305/026Y02W10/37
Inventor 马军程平统吴丽颖孙志强甄宇菲李璐玮佘月城
Owner HARBIN INST OF TECH
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