Recycling treatment system and recycling treatment method of dewatered sludge

Abstract

The invention relates to a recycling treatment system and a recycling treatment method of dewatered sludge. The recycling treatment system is composed of an incineration boiler, a first flue gas waste heat exchanger, a sludge storage pool, an alkaline conditioning chamber, a thermal cracking chamber, a dewatering chamber, a second flue gas waste heat exchanger, a waste heat drying chamber and an anaerobic fermentation tank. The recycling treatment method comprises the following steps: firstly, performing alkaline conditioning and thermal cracking on the dewatered sludge and then dewatering to obtain a solid phase and a liquid phase, performing drying treatment on the solid phase with thermal cracking flue gas waste heat as a heat source to obtain the dried sludge, and producing biogas from the liquid phase with drying flue gas waste heat as the heat source. The recycling treatment method realizes the removal of easily removable moisture in the sludge and also realizes sludge stabilization; meanwhile, the recycling treatment method is capable of promoting further efficient removal and biochemical degradation of the moisture content in the sludge; and as a result, the problems of low drying efficiency, easy binding and easy explosion are solved, and efficient recycling utilization of the sludge based on phase separation is realized.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a resource treatment system and method for dewatered sludge. Background technique [0002] Urban sewage treatment plants produce a large amount of sludge every year, with high water content (about 80%) and treatment costs, which have become the bottleneck factors restricting the development of this industry. The separate construction of sludge disposal facilities (such as incineration facilities) is not only high in investment costs, but also expensive in operating costs. Using waste heat resources from other industries to dry sludge and incinerating sludge with combustion equipment can greatly reduce sludge treatment costs. For example, using Dried sludge from cement plant flue gas waste heat and brick kiln flue gas waste heat can be used as building materials or as alternative fuels, such as patent CN200910102069.4 using cement plant flue gas waste heat to ...

AI Technical Summary

Problems solved by technology

This method uses the waste heat of flue gas as the heat source, adopts thermal cracking technology, obtains solid phase and liquid phase through dehydration, and then carries out resource treatment respectively, so as to solve the problem of poor treatment effect, high cost and ineffective prevention of existing dewatered sludge treatment process. The problem of secondary pollution

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