Pre-electrolysis-based wet catalytic oxidation sludge treatment system and method

Abstract

The invention relates to the technical field of sludge treatment systems and methods, and provides a pre-electrolysis-based wet catalytic oxidation sludge treatment system and method, wherein the pre-electrolysis-based wet catalytic oxidation sludge treatment system comprises a sludge storage tank, a spiral slag remover, a homogenizer, an electrolysis electromagnetic heater, a segmented stepped heater assembly and a reaction kettle, and the devices are sequentially connected through pipelines. The defects of the prior art are overcome, the design is reasonable, and the structure is compact; the temperature rise of a sludge inlet and a sludge outlet in each section of heater is constant by adopting a segmented gradient type heating structure, and the heating coil power can be adjusted according to different sludge process parameters to meet the temperature rise requirement. Before sludge enters the heaters, the sludge subjected to primary heat exchange is pretreated in a pre-electrolysis mode, and the viscosity of the sludge is reduced to assist conveying and reaction in the sludge process. And the form of heat exchange between treated sludge and raw sludge is adopted, waste heat recovery is enhanced, and the system heat efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of a sludge treatment system and a method thereof, in particular to a pre-electrolysis-based wet catalytic oxidation sludge treatment system and a method thereof. Background technique [0002] With the rapid development of science and technology, a lot of sludge will be produced in production and life. The main components of these sludge include water, microorganisms, microbial metabolites, and inorganic solids. These sludges are very harmful to the environment and need to be treated. Sludge is processed so that it can be reused in compliance with emission standards. [0003] It is difficult to treat a variety of pollutants thoroughly through conventional sludge treatment systems, which brings great difficulties to the removal of bound water and intracellular water in sludge, because the water in these sludges contains special properties High-molecular organic matter, these high-molecular organic matter ser...

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Problems solved by technology

[0003] It is difficult to treat a variety of pollutants thoroughly through conventional sludge treatment systems, which brings great difficulties to the removal of bound water and intracellular water in sludge, because the water in these sludges contains special properties High-molecular organic matter, these high-molecular organic matter seriously affect the discharge standard of sludge, and because of the existence of these high-molecular organic matter, the sludge and water are very tightly combined, and separation is very difficult

[0004] Because the reaction requires high temperature (180-300°C), there will be many problems after the equipment is enlarged, and it is difficult to apply industrially. The current existing processes and systems have the following problems:

[0005] 1. After the large-scale equipment, the traditional jacketed heating reactor consumes too much energy, and the heating effect is poor. Using the jacket alone to heat the sludge is too slow, and the temperature difference between the temperature inside the jacket and the sludge before the reaction can reach 200 -300 degrees, the coking phenomenon is serious after the sludge sticks to the wall and it is difficult to clean up

[0006] 2. Generally, the water content of reactive sludge is 80%-90%, and the sludge is similar to pseudoplastic fluid. When the water content of high-viscosity sludge is low, its viscosity is relatively high, which is not conducive to heating and pipeline transportation. When sludge When the water content is high, although the viscosity of the sludge is effectively reduced, the volume of the sludge also increases, resulting in an increase in storage capacity and a decrease in treatment capacity.

[0007] 3. After treatment, the sludge still carries a lot of heat, and direct discharge will cause thermal pollution and waste of resources

[0008] 4. It is difficult to completely oxidize the sludge with high polymer organic content

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