Method for vertical solar intensified deep biological drying of sludge

Abstract

The invention discloses a method for vertical solar intensified deep biological drying of sludge. Dewatered sludge undergoes drying treatment through a biological drying and solar drying secondary coupling process. The sludge drying method comprises the steps of adding auxiliaries materials and back mixing materials in a material mixer to regulate and inoculate the dewatered sludge; causing evenly-mixed materials to undergo fast biological drying in a biological drying chamber; causing the materials having undergone the biological drying to be further dewatered in a solar drying chamber; causing the materials having undergone solar drying to be screened on a vibrating screen, causing oversize products to flow back as the back mixing materials, and taking screen underflow as a final product. According to the method, quick drying of the sludge is performed by coupling effects of biological thermal energy generated by microorganism aerobic fermentation and clean renewable solar energy, the method has the advantages of being high in drying efficiency, low in operation efficiency and small in occupied space and the like, and the sludge reducing quantity and resource utilization level are improved.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a method for vertically solar-enhanced deep biological drying of sludge. Background technique [0002] With the rapid development of urban sewage treatment in China, the number of sewage treatment plants is increasing, and the amount of sludge generated is also increasing. At present, there are more than 4,000 urban sewage treatment plants in China, and the annual sludge production is more than 40 million tons (water content 80%). Sludge not only has high water content and is very bulky, but also contains a large amount of refractory organic matter, heavy metals, pathogenic microorganisms and parasite eggs, etc. If it is not treated effectively, it will easily cause secondary pollution and affect the effect of environmental governance. At present, the sludge treatment in China mainly focuses on concentration and dehydration, but the moisture content...

AI Technical Summary

Problems solved by technology

Nevertheless, the energy efficiency of the solar drying unit is low, requires a long residence time and a large footprint, so there needs to be enough available site space in the sewage treatment plant

Moreover, the effect of solar drying treatment is restricted by weather and seasonal conditions, and it is difficult to maintain uniform and continuous operation. For this reason, many solar drying processes use heat collection or combined application with other auxiliary heat sources, but this increases the process cost

And even so, the engineering application results in Germany show that the sludge needs to stay in the drying workshop throughout the winter, which further increases the floor space requirements of the solar drying device

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