Internal circulation self-heating type high-temperature microaerobic sludge digestion device

Abstract

The invention discloses an internal circulation self-heating type high-temperature microaerobic sludge digestion device. The internal circulation self-heating type high-temperature microaerobic sludge digestion device comprises an outer cylinder body and an inner cylinder body, which are coaxial, wherein a heat-insulation material covers the outer part of the outer cylinder; the inner cylinder is fixed and suspended in the outer cylinder through a bracket and is internally provided with an axial-flow mechanical agitating device; a horizontal plane of the bottom end of the inner cylinder is provided with micro-pore aerators; an air flow branch pipe connected with an aeration pipe is used to carry out de-foaming treatment on foams. According to the internal circulation self-heating type high-temperature microaerobic sludge digestion device disclosed by the invention, all aeration amounts are concentrated in the inner cylinder under a low aeration amount level of self-heating type high-temperature aerobic digestion, so that sludge in the inner cylinder can be more sufficiently oxidized, all sludge in a reaction system is prevented from being at an oxygen-poor or anaerobic state, and sludge degradation and heat release are accelerated. The sludge of the inner cylinder and the outer cylinder can circulate and reciprocate between the inner cylinder and the outer cylinder under the effect of the mechanical agitating device, so that the temperature of the whole reaction system rises rapidly, and the digestion efficiency of the whole reaction device is improved. The hopper-shaped bottom of the outer cylinder is good for collecting and removing of sand so as to prevent holes of the aeration devices from being blocked.

Description

technical field [0001] The invention relates to the stabilization treatment of biomass sludge in the technical field of environmental engineering, in particular to an internal circulation self-heating sludge high-temperature micro-aerobic digestion device. Background technique [0002] In recent years, my country's sewage treatment volume and the number of sewage treatment plants have increased significantly, and the amount of sludge produced by sewage treatment plants has also increased significantly. In order to prevent improper disposal of sludge from harming the environment, the Ministry of Housing and Urban-Rural Development has repeatedly emphasized that sludge should be stabilized in accordance with the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) before land use and landfill. , and in March 2011 re-launched the "Technical Guidelines for Sludge Treatment and Disposal of Urban Wastewater Treatment Plants" to emphasize this. At prese...

AI Technical Summary

Problems solved by technology

However, based on the autothermal high-temperature aerobic digestion of sludge, it is necessary to achieve a balance between the heat generated by the degradation of organic matter and the heat taken away from the system by aeration. Anaerobic state, thus, making it difficult to further improve the sludge digestion efficiency

It is also because of the existence of this problem that in the actual application process of the self-heating sludge high-temperature aerobic digestion technology, the residence time of the sludge stabilization often exceeds the theoretical value, most of which exceed 15 days, and the unit sludge treatment The land-saving effect of facilities is not obvious, thus greatly reducing the promotion willingness of relevant technology users in our country

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