Mechanical filter-press microwave coupled dehydration drying method

Abstract

The invention relates to a mechanical filter-press microwave coupled dehydration drying method. The method comprises the following steps: enabling microwave conditioning, dehydrating and drying into an organic whole, conditioning sludge under the microwave action and destroying a colloidal structure of the sludge; meanwhile, expanding sludge particles, reducing water adsorption between particles and improving dewatering performance; drying the sludge through high microwave heating efficiency to further reduce the water content of the sludge. In situ microwave conditioning dehydration is formedwithout pump transportation; in situ drying is formed without needing a conveyor device to input the sludge into a drying system; a microwave generator plays different roles at different treatment stages; at the conditioning stage, the cell wall breaking function of the microwave is utilized for conditioning; at the drying stage, high microwave heating efficiency is utilized to dehydrate; meanwhile, negative pressure is used in drying, so that the drying efficiency is further improved and energy consumption is reduced.

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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