Method for preparing sludge-based biochar and application

Abstract

A method for preparing sludge-based biochar relates to the technical field of sludge-based biochar preparation. The method comprises the following steps: municipal sludge is successively concentrated,conditioned for modification, and highly dried for dewatering, so that a dewatered sludge cake is obtained; and the sludge-based biochar is obtained by conducting crushing, drying and pyrolysis carbonization on the dewatered sludge cake. An agent added in the conditioning modification is one or more of inorganic coagulants, organic coagulants and additives, wherein the inorganic coagulant is at least one of aluminum sulfate, potassium aluminum sulfate, sodium aluminate, ferrous sulfate, ferric sulfate, polyferric sulfate, poly aluminum sulfate and polysilicate ferric; the additive is at leastone of fly ash, plant ash, sawdust and rice husk bran. The invention can utilize sludge for waste utilization and produce the sludge-based biochar which can promote plant growth. The invention has the advantages of converting sludge into fertilizer for promoting plant growth and improving economic benefit of planting.

Description

technical field [0001] The invention belongs to the technical field of sludge-based biochar preparation, and in particular relates to a preparation method and application of sludge-based biochar. Background technique [0002] With the development of urbanization and the improvement of sewage treatment capacity, urban surplus sludge as a by-product of sewage treatment plants has increasingly become a new problem that cannot be ignored. A large amount of sewage sludge is produced in our country every year, and the sludge contains a large number of toxic and harmful substances such as bacteria, fungi, parasites, pathogens and heavy metals. If these sludges are not treated in time and piled up arbitrarily, it will not only occupy a large amount of land resources but also easily cause secondary pollution to the environment. [0003] At present, research on biomass carbonization with biochar as the main target is gradually emerging. Converting biomass into charcoal and applying i...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a sludge-based biochar preparation method and its application, realize consumption and treatment of municipal sludge to reduce environmental pollution, use sludge for waste utilization, and produce sludge-based biochar that can promote plant growth , has the advantages of reducing sludge discharge, converting it into fertilizer that can promote plant growth, improving the economic benefits of planting plants, and relatively lower cost than fertilizers. It solves the problem that too much sludge will not only occupy a large amount of land resources but also easily cause environmental damage. The problem of secondary pollution

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