Process for preparing active carbon by co-decomposition of city sludge and agricultural wastes

A technology for preparing activated carbon from agricultural waste is applied in the field of co-pyrolysis of municipal sludge and agricultural waste to produce activated carbon, which can solve the problems of high construction and operation costs, inability to be popularized and applied, and high equipment investment.

Inactive Publication Date: 2008-11-19
CHINA UNIV OF MINING & TECH
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge incineration was once very popular. However, sludge incineration has limited its use due to large one-time investment, high investment in equipment, high operating costs, the production of highly toxic substances such as dioxin, and the need for reprocessing of incineration ash.
Due to the complexity of the incineration equipment, the c

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, the pulverized rice straw that is 60% by weight on a dry basis and the municipal sludge that is 40% by weight on a dry basis are uniformly mixed; the air is isolated and heated to 350 ° C, and the solid product is taken out after constant temperature for 10 minutes and cooled, and then the solid The product is pulverized to obtain an iodine value of 404mg / g gac product.

Embodiment 2

[0021] Embodiment two, the pulverized rice straw that is 40% by weight on a dry basis and the municipal sludge that is 60% by weight on a dry basis and the nitrate that is 3.5% by weight are mixed uniformly; Insulated air is heated to 400 ° C, after constant temperature 10min The solid product is taken out and cooled, and then the solid product is pulverized to obtain an iodine value of 506mg / g gac product.

Embodiment 3

[0022] Embodiment 3, the pulverized straw that is 28.50% by weight on a dry basis, the municipal sludge that is 68% by weight on a dry basis, and the nitrate that is 3.5% by weight are mixed evenly; the air is isolated and heated to 450 ° C, and taken out after 10 minutes at a constant temperature The solid product is cooled, and then the solid product is pulverized to obtain an iodine value of 425mg / g gac product.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A process for preparing activated carbon by co-pyrolysis of municipal sludge and agricultural waste comprises the steps of mixing the agricultural waste and the municipal sludge in a certain proportion to obtain a mixture; heating the mixture at a certain temperature under the condition of air isolation, keeping the temperature for a period of time, collecting a solid product, and cooling; and pulverizing the solid product to obtain the activated carbon product. In order to obtain an activated carbon with higher absorptive capacity, a certain amount of nitrate can be added into the mixture. Because the agricultural waste can make up the low heat value shortcoming of the sludge, while the municipal sludge can solve the problems with the agricultural waste that the pyrolysis solid product is easy to flow away and difficult to store, the inventive process can not only solve the high energy consumption and high cost problems of the prior sludge incineration, pyrolysis and other heat treatment methods, but also can be used for environmental treatment to save energy and reduce emission.

Description

technical field [0001] The invention relates to the preparation of activated carbon, in particular to the co-pyrolysis of municipal sludge and agricultural waste to prepare activated carbon. Background technique [0002] Municipal sludge is the sediment produced in the process of municipal sewage treatment. By 2006, a total of 791 sewage treatment plants had been built in 661 cities with municipalities in my country, and the annual sludge output (dry weight) was about 1.73 million tons, and it was increasing at a rate of about 10% every year. It is generally believed that the amount of sludge usually accounts for about 0.5% to 0.7% (volume) of the amount of sewage, or about 1% to 2% (mass) of the amount of sewage treatment. If the depth of sewage treatment increases, the amount of sludge will sometimes increase by 0.5 to 1 times. [0003] Municipal sludge is the sludge discharged from urban sewage treatment plants, and it can also be the sludge containing organic matter di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B31/08
Inventor 张双全
Owner CHINA UNIV OF MINING & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap