Rapid drying process of sewage sludge based on microwave-polar medium substances

Abstract

The invention discloses a rapid sewage sludge drying process based on a microwave-polar medium material. According to the method, mixed slurry prepared from a mixed solvent and the polar medium material are added to sludge-containing sewage in a flocculation stirring tank in the process of sludge flocculation and sedimentation, wherein the mixed solvent is prepared from organic polymer flocculantPAM (polyacrylamide) and inorganic polymer coagulant PAC (polyaluminium chloride), so that activated carbon powder and the manganese dioxide polar medium material are fully and uniformly mixed with sludge in the process of sludge flocculation and finally uniformly distributed in the precipitated aqueous sludge, and then the precipitated flocculated water-containing sludge uniformly mixed with thepolar medium material is filtered by a belt filter press, and sludge cakes are formed and transported into microwave drying equipment by a conveyor belt for rapid drying. Utilization efficiency of microwave energy is increased by adding the medium material to the sludge, the heating rate is increased, the purpose of rapidly drying the sludge is achieved, emission of pollutants in the sewage is reduced, sludge dehydration energy consumption is reduced by 40%-50%, and dehydration efficiency is increased by 50% or higher.

Description

technical field [0001] The invention relates to the technical field of sewage sludge treatment, in particular to a rapid drying treatment process for sewage sludge based on microwave-polar medium substances. Background technique [0002] In the process of sewage treatment, sludge treatment has always been a concern of people in the industry. At present, the sludge drying equipment is mainly mechanical dehydration and thermal dehydration. The main mechanical equipment are: drum vacuum filter, rotary barrel centrifuge, plate and frame filter press, belt filter press dehydrator, screw press Dehydrator, paddle machine, sleeve machine or fluidized bed, etc. In addition, the current treatment methods for excess sludge in the sewage treatment process mainly include sanitary landfill, comprehensive land utilization, heat treatment, sludge composting, ultrasonic digestion of sludge, etc. In order to facilitate the transportation, storage, stacking and utilization of sludge, Sludge ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of using conventional microwaves to dry sludge in the traditional sludge drying and dehydration process, the utilization rate of microwave energy is low, and the temperature rises slowly. Heating rate to achieve the purpose of rapid sludge drying, providing a rapid drying treatment process for sewage sludge based on microwave-polar medium substances that increases the density of sludge flocs in wastewater and improves sludge drying efficiency , which consists of the following steps,