Vertical solar-enhanced deep biological sludge drying system

Abstract

The invention discloses a vertical solar-enhanced deep biological sludge drying system, capable of carrying out drying treatment on dewatered sludge by means of a biological drying and solar drying two-stage coupling technology. The system includes but not limited to a mixer, a biological drying chamber, a solar drying chamber, a vibrating screen, an air blower, an aerating system, a gas collection system, a gas scrubber, a gas circulation system, a heat exchange device, an induced draft fan and an underground soil biological filter bed. The solar drying chamber is vertically arranged above the biological drying chamber, a hydrophobic composite membrane is laid at the inner side of a roof, and stainless steel chain plate(s) is/are installed at the single side or double sides of the roof. The system utilizes the coupling effect of the biological heat energy generated by aerobic fermentation of microorganism and the clean and renewable energy-solar energy to realize rapid drying of the sludge, has the characteristics of being high in drying efficiency, low in running energy consumption, small in land occupation area, and the like, and improves the reduction level and the resource utilization level of the sludge.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and in particular relates to a vertical solar enhanced sludge deep biological drying system. 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 of the s...

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

Images