Device and method for desanding and disinfecting pretreatment of municipal sludge

Abstract

The invention provides a device and a method for performing desanding and disinfecting pretreatment on municipal sludge with high sand content (solid containing rate is 8%-30%). The device comprises a preheating catalytic hydrolysis reactor, a hydrothermal desanding and disinfecting reaction kettle, a clinker heat exchange system and a steam recycling system. The pretreatment can be performed on the material through the preheating catalytic hydrolysis reactor to remarkably reduce viscosity of the materials, promote organic matter in the material to be hydrolyzed and easily separate the sludgefrom micro sand. In order to improve the energy utilization rate of a system, energy of the follow-up hydrothermal desanding and disinfecting reaction kettle is recycled to serve as a heat source required by the preheating catalytic hydrolysis reactor. According to the method, the organic matter can achieve high-efficiency hydrolyzing conversion without using a flash evaporation process needed bya conventional thermal hydrolysis process. The method can be used to improve flowability, dewatering and desanding performance and follow-up anaerobic digestion performance of the material and can serve as a pretreatment system of a dewatering drying or anaerobic digestion process.

Description

technical field [0001] The invention relates to a device and method for waste treatment, in particular to a device and method for pretreatment of high-solid urban sludge for desanding and disinfection, which are used to improve the fluidity of organic materials after treatment and reduce the sand content of sludge amount and realize the harmless treatment of sludge. Background technique [0002] With the accelerated development of urbanization, the amount of municipal sludge, including domestic organic waste, has increased dramatically. Based on the concept of sustainable development of the ecological environment, how to effectively integrate and treat urban sludge has become an urgent problem in urban development. [0003] There are many different technical means for the treatment of municipal sludge. For example, in the patent document 200610003898.3, a method for harmless, resourceful, and reduction treatment of organic waste is described, which involves pyrolysis, whic...

AI Technical Summary

Problems solved by technology

[0007] The sand content of urban sludge in China is generally high, which leads to the problem of wear and tear of subsequent treatment facilities such as anaerobic digestion. It is yet to be developed to effectively treat high-solid urban sludge and improve the fluidity and anaerobic properties of the treated sludge. Device and method for digestibility, reducing sludge sand content and realizing sludge harmlessness

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