Drying treatment method for municipal sludge

Abstract

The invention discloses a method for drying urban sludge. The urban sludge is mechanically dehydrated in a dehydrator first, and the dehydrated sludge has a moisture content of 80%, and is sent to a first quantitative feeder by a conveyor for further drying. Quantitative feeding, transported to the mixing equipment with the first belt conveyor; the 20% moisture content sludge in the second sludge feeder is transported to the mixing equipment through the second belt conveyor, and the dry and wet sludge are evenly mixed; mixed After entering the solar drying equipment, the solar drying equipment is connected with the second sludge feeder; lime and acidic iron and aluminum sulfate are added to the solar drying equipment, and then granulated by the granulation equipment, and dried by the solar drying equipment. Part of the sludge after passing through the granulation equipment is transported to the fertilizer workshop for agricultural use, and part of it is returned to the second sludge feeder. The invention has the characteristics of convenient operation, less energy consumption and low maintenance cost, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and relates to a method for drying urban sludge. Background technique [0002] With the development of my country's sewage treatment industry, the improvement of sewage treatment capacity has caused a sharp increase in sludge production. Sludge drying is a process that uses heat to quickly evaporate and remove water in sludge. After drying, the sludge The performance of the mud is improved, the utilization value is increased, and conditions are created for the subsequent treatment. [0003] Since the energy crisis in the 1970s, solar energy, as an available new energy source, has gradually become the focus of research at home and abroad. Solar energy has been valued by people for its inexhaustible, safe, non-transportable, clean and non-polluting advantages. In recent years, there has been intensive research on solar drying applications. [0004] After the municipal sludge is de...

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Problems solved by technology

[0004] After the municipal sludge is dehydrated by a belt machine or a centrifuge, the solid content of the sludge can only be increased to 20%-25% DS, the maximum is 30% DS, and each ton of dewatered sludge still contains 700-800kg of DS moisture, the solid content must be further increased. The equipment used in the sludge drying method in the prior art has high energy consumption, high maintenance costs, and cumbersome operations. Municipal sludge drying treatment method

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