Sludge drying process

Abstract

The invention discloses a sludge drying process. The sludge drying process comprises the following steps of firstly transporting urban sludge with the water content of 80-85% into a sludge storage bin for sealed storage, controlling a grab crane to grab the sludge in the sludge storage bin and send into a feed hopper of a sludge feed device through a PLC (programmable logic controller) system, simultaneously adding a curing agent into the hopper, fully stirring, then transporting the sludge to a drying room of a drying device, utilizing residual heat from a flue and a ceiling of the drying room to absorb solar energy for a PC (polycarbonate) sun board in the drying room to perform heating, dehumidification and drying on the sludge in the drying room, and further conveying the dried sludgeto the outside of the drying room through a material conveying machine. According to the sludge drying process disclosed by the invention, the sludge is operated in a closed environment and is not directly exposed in air, and toxic and harmful gas carried in the sludge can be prevented from polluting the environment; the residual heat of a brick kiln and the solar energy are utilized for drying, so that physical heat at the tail part of burned bricks in a tunnel kiln can be fully utilized, the heat of the sludge is increased and energy can be greatly saved; and a test proves that the water content in the dried sludge is low and can achieve 10-25%.

Description

technical field [0001] The invention belongs to the harmless treatment and resource utilization technology of urban sludge, in particular to a sludge drying process. Background technique [0002] Municipal sludge refers to the solid waste generated during the treatment of urban domestic sewage and industrial wastewater, and is a regular product of urban sewage treatment plants. This sludge has a high water content, is perishable, has a strong odor, and contains toxic substances such as dioxins, bacteria, parasite eggs, and heavy metals. Therefore, it is necessary to carry out harmless treatment and reuse of sludge, and the drying of sludge is a necessary step in sludge treatment. At present, the drying methods mainly include: traditional thermal sludge drying and solar sludge drying. [0003] Traditional thermal sludge drying refers to the use of sludge thermal drying integrated equipment to dry sludge. According to the contact mode of heat medium and sludge, drying equip...

AI Technical Summary

Problems solved by technology

For example, the energy consumption required for drying is relatively large, the moisture content of the dried sludge is relatively high, the waste gas treatment is not thorough enough, there is still a large amount of toxic gas, and the dried sludge has not been further used

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