Mechanical filter press microwave coupling dehydration drying method

Abstract

The invention relates to a mechanical filter press microwave coupling dehydration and drying method, which forms an organic whole through microwave conditioning-dehydration-drying, and first conditions the sludge through the action of microwaves, destroys the colloidal structure of the sludge, and increases the sludge particles at the same time , reduce the adsorbed water between the particles, improve the dehydration performance, and then dry the sludge with high microwave heating efficiency to further reduce the moisture content of the sludge. In-situ microwave conditioning and dehydration is formed without pumping, and in-situ drying is formed. There is no need for a conveying device to input sludge into the drying system. Microwave generators play different roles in different processing stages. In the conditioning stage, the wall-breaking function of microwave is used for conditioning. In the drying stage, the high heating efficiency of microwave is used for dehydration. At the same time, negative pressure is used during drying to further improve drying efficiency and reduce energy consumption.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a mechanical press filter microwave coupling dehydration and drying method. Background technique [0002] Municipal sludge is the product of sewage treated by sewage treatment plants. It is a heterogeneous body with high water content composed of organic debris, bacterial cells, inorganic particles, etc. It is difficult to dehydrate by ordinary methods. [0003] The early sludge treatment devices include plate and frame filter press, drum centrifuge and belt filter press. After dehydration by these equipment, the moisture content of the sludge is generally about 75%, and the moisture content of these sludges is still very high. For The transportation and cost are high, and it cannot be directly disposed of in the landfill. If it is placed for a long time, the germs surviving in the sludge will exceed the standard, and it will be perishable and produce stench, causing enviro...

AI Technical Summary

Problems solved by technology

There are several problems in the existing technology: 1. Microwave conditioning, mechanical dehydration, and drying are different stages, and separate equipment needs to be equipped, which makes the whole system complicated and cumbersome; 2. The sludge particles after microwave conditioning increase, and then After shearing and conveying by the pump, the large particles of sludge are broken into small particles, which affects the dehydration performance; 3. The current microwave drying consumes a lot of energy, and the heat energy is not fully utilized.

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