Preparation method and application of composite sludge activated carbon

By mixing the two-stage dried sludge with natural carbon-containing organic materials and using chemical activators to prepare composite sludge activated carbon, the problems of low carbon content and poor adsorption performance of traditional sludge activated carbon are solved, achieving efficient wastewater and flue gas treatment, and realizing a virtuous cycle of resources and improved economic benefits.

CN122079153APending Publication Date: 2026-05-26CHINA RAILWAY WATER GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA RAILWAY WATER GRP CO LTD
Filing Date
2026-01-05
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Traditional methods for preparing activated carbon from sludge result in low carbon content and poor adsorption performance. Furthermore, the activated carbon prepared by existing technologies has a small specific surface area and limited adsorption capacity, making it difficult to effectively apply to the deep purification of wastewater and flue gas, leading to resource waste and environmental pollution.

Method used

The sludge, after two-stage drying, is mixed with natural carbon-containing organic materials and treated with chemical activators ZnCl2, NaOH, and phosphoric acid to prepare composite sludge activated carbon, forming activated carbon with well-developed pore structure, large specific surface area, and high adsorption performance.

Benefits of technology

It improves the adsorption capacity of activated carbon, realizes a virtuous cycle of sludge resources, reduces the incineration of natural organic matter, lowers costs, and forms a virtuous cycle of resources within the sludge plant.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application relates to the field of activated carbon preparation technology, and provides a method for preparing composite sludge activated carbon, comprising: drying, grinding, and sieving sludge after two-stage drying to obtain powdered sludge; dehydrating, drying, pulverizing, and sieving carbon-containing materials to obtain powdered carbon-containing materials; mixing the powdered sludge and powdered carbon-containing materials at a mass ratio of 1:2 to 1:4, and carbonizing in a sealed environment at 400℃ to 600℃ for 120 min to 180 min to obtain mixed carbon; immersing the mixed carbon in an activating agent aqueous solution at a preset temperature for 10 h to 14 h, drying to constant weight, and then pyrolyzing and activating at 500℃ to 600℃ for 0.5 h to 1 h, and cooling to obtain semi-finished activated carbon; washing the semi-finished activated carbon with hydrochloric acid and then washing it with deionized water until neutral to obtain composite sludge activated carbon. This application provides a method for preparing composite sludge activated carbon, and the addition of carbon-containing organic materials can further improve the adsorption capacity of activated carbon.
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