Municipal sludge drying tail gas treatment device and method

Abstract

The invention discloses a municipal sludge drying tail gas treatment device and method. The device comprises a drying device, wherein an air outlet of the drying device is connected with a cyclone dust collector, the tail gas generated after dedusting sequentially passes a bath tower, an alkaline tower and a biological filter and is sucked and exhausted through an induced draft fan, the air outlet of the drying device is connected with an air inlet of the cyclone dust collector, an air outlet of the cyclone dust collector is communicated with an inlet of the bath tower, an outlet of the bath tower, an inlet of the alkaline tower, an outlet of the alkaline tower and an inlet of the biological filter are sequentially communicated, an air outlet of the biological filter is connected with the induced draft fan, the bottom of the alkaline tower and the bottom of the biological filter are directly communicated with the top of the alkaline tower and the top of the biological filter respectively and communicated with a sewage disposal system used for carrying out secondary treatment on waste liquid produced by the alkaline tower and the biological filter. External water in a water replacement system in a sewage plant serves as absorbing solvents, the waste liquid coming out from the bottoms of the towers is treated through the sewage disposal system and then is returned to an absorbing tower, the use amount of water is greatly reduced, and operating expenses are reduced.

Description

[0001] technical field [0002] The invention discloses a treatment method for the tail gas of urban sludge drying, which is used for the treatment of the tail gas after the sludge is dried. Background technique [0003] The large amount of water contained in municipal sludge leads to its large volume, easy corruption, breeding of pathogens and parasites, and difficult utilization of calorific value. Therefore, in order to meet the requirements of "reduction, stabilization, harmlessness and recycling", water removal is the key. Application practice at home and abroad shows that after the traditional concentration and dehydration process, the moisture content of the sludge cannot reach below 60%. After thermal drying of municipal sludge, the moisture content can reach below 15%, the capacity can be reduced by 80%, and the calorific value can be increased by 10 times. Moreover, the sludge microorganisms after thermal drying are almost completely killed, and can be stored stab...

AI Technical Summary

Problems solved by technology

This method uses a large amount of chemical reagents for water, and the waste liquid produced after absorption needs to be treated, and there is a problem of secondary pollution, which requires the addition of sewage treatment devices, which increases the investment cost of equipment; the overall energy consumption is high, and the operation and maintenance The cost is also high, especially for high-concentration odor

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