Method for treating sludge by microwave enhanced wet-type catalytic oxidation

Abstract

The invention discloses a method for treating sludge by microwave enhanced wet-type catalytic oxidation. The method comprises the following steps: uniformly mixing the sludge with an oxidizing agent and a catalyst, then introducing the mixture into a microwave reactor for heating and catalytic degradation, finally separating by using a three-phase separator to obtain green sludge, and recycling the catalyst. The preparation method is simple, and the preparation device is reasonable in arrangement, the sludge is decomposed in a microwave heating mode, the decomposition efficiency is high, the environmental pollution is reduced, and good practicability is achieved.

Description

technical field [0001] The invention belongs to the technical field of wet catalytic oxidation treatment of sludge, in particular to a method for microwave enhanced wet catalytic oxidation treatment of sludge. Background technique [0002] The origin of wet oxidation has been more than 100 years ago, and the research is relatively thorough. It is widely used in the treatment of high-concentration organic wastewater and sludge, but due to high temperature and high pressure, easy corrosion of equipment, high requirements for equipment, and high treatment costs, most of its engineering applications are abroad. The principle of the famous Zimpro, ATHOS, Ver Tech and other processes is catalytic wet oxidation, the typical process conditions are 230-270°C, 4-12MPa, and copper is generally used as the catalyst. In traditional wet oxidation, more than 90% of the operating cost is spent on raising the liquid temperature, and the main heating methods are steam heating and electric he...

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Problems solved by technology

[0003] Steam heating is a commonly used heating method. The thermal efficiency of large boilers can reach more than 80%, but the source of steam is usually boilers (oil-fired boilers, coal-fired boilers and gas-fired boilers), but secondary pollution such as tail gas and slag must be dealt with, and operating costs On the other hand, the mixing degree of steam and liquid is directly related to the heating effect. The smaller the particle size of the steam is, the more dispersed it is, and the better the heating effect is.

Electric heating has no secondary pollution, simple equipment, and low cost. Usually, electric heating rods or electromagnetic heating are used, but after secondary energy conversion (coal-fired fuel oil to electricity, electricity to heat), the thermal efficiency is low, only about 60%. At the same time, the heat exchange efficiency of electric heating is greatly affected by the contact area between the heating medium and the liquid

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