Disposal system of municipal dewatering sludge

Abstract

The invention relates to a disposal system of municipal dewatering sludge, and belongs to the technical field of environmental engineering. The disposal system comprises a high-temperature and high-pressure reactor, a sludge cooling device, a magnetic powder hopper, a stirrer, a magnetizer, an anaerobic digestion cavity, a magnetic powder separation device, a feeding hopper, a metal magnetic separation device, a dewatering device, an afterheat drying device and a mud cake collecting device. The anaerobic digestion efficiency of the sludge can be improved by the sludge preprocessed by the high-temperature and high-pressure magnetic powder and the magnetizer; heavy metal in the sludge can be effectively extracted by the metal magnetic separation device; the late sludge disposal difficulty is reduced; the magnetic powder added in the sludge can be effectively separated by the magnetic powder separation device, so that the magnetic powder can be recycled, and the cost is saved. The afterheat drying device fully utilizes the afterheat of the sludge preprocessed by the high-temperature and high-pressure reactor, so that the energy is greatly saved; system parameters are set on a computer, and the data is processed by computer program, so that the efficiency of the system is greatly improved.

Description

technical field [0001] The invention relates to a municipal dewatered sludge treatment and disposal system, which belongs to the technical field of environmental engineering. Background technique [0002] With the rapid development of urbanization in China, the environmental safety problems caused by the rapid increase of urban sludge discharge have become increasingly prominent. Municipal dewatered sludge has the characteristics of high hydrophilicity, high water content, high organic matter content, low permeability and heavy metals in varying degrees, which makes it difficult to dispose of in the project. How to further reduce the water content, organic matter and heavy metals of municipal dewatered sludge? Deal with key issues of disposal. [0003] At present, the main disposal methods involve (1) using cement kilns and tunnel kilns to dry directly as low-heat fuel or fertilizer; (2) using other equipment to dry high-temperature flue gas or hot water waste heat as fuel ...

AI Technical Summary

Problems solved by technology

Due to the high water content of the sludge, direct drying consumes a lot of energy and costs high; although the organic matter in the sludge is used as fuel after drying, the smoke and ash produced are still difficult to handle; after drying, it can be used as land, etc. There is also the risk of heavy metal pollution to the environment; sludge modification and landfill cannot use the biomass energy in the sludge, and the high water content requires the addition of a large proportion of modifiers, and there is still a risk of heavy metal pollution to the environment; although the use of biological methods It is a green treatment method, but it is difficult to improve the utilization value of sludge without combining with other methods of removing heavy metals

[0004] The above-mentioned existing technologies have improved the difficulty of sludge disposal to a certain extent, but sludge disposal is a comprehensive disposal technology involving dehydration, biomass energy utilization and heavy metal removal

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