Sludge treatment system and method in cement kiln

Abstract

The invention discloses a sludge treatment system in a cement kiln, which is characterized by comprising a sludge drying device, a sludge incineration device, a sludge drying waste gas treatment device, a waste water treatment device, a first delivery mechanism for delivering dried sludge to the sludge incineration device, a second delivery mechanism for delivering sludge drying waste gas to the sludge drying waste gas treatment device, and a third delivery mechanism for delivering waste water generated by the sludge drying waste gas treatment device to the waste water treatment device, wherein the sludge drying device is connected with the sludge incineration device through the first delivery mechanism; the sludge drying device is connected with the sludge drying waste gas treatment device through the second delivery mechanism; and the sludge drying waste gas treatment device is connected with the waste water treatment device through the third delivery mechanism. The overall system achieves zero discharge of waste residue and waste water, and the waste gas discharge is lower than the limit value in the national discharge standard, thereby achieving the goal of converting sludge into resources and harmless substances.

Description

technical field [0001] The invention belongs to the field of waste disposal and utilization, in particular to a cement kiln sludge treatment system and method. Background technique [0002] Sewage treatment plants in cities and enterprises in our country produce a large amount of wet sludge every day, which is mainly composed of microbial cell groups and their disintegration products. In addition to high organic matter content, it also contains a large amount of harmful substances such as heavy metal ions and pathogenic bacteria, and has high water content. Large volume, complex shape, difficult transportation and other characteristics. [0003] The treatment methods of municipal sludge mainly include landfill, use as agricultural fertilizer and incineration. Due to the high content of heavy metals and pathogenic bacteria in the sludge will spread in the soil, it will lead to high pollution of the soil and the crops planted on the soil surface, while the landfill sludge wil...

AI Technical Summary

Problems solved by technology

However, there are the following problems: due to the high water content (above 80%) and low calorific value of the sludge, it takes a lot of fuel to be directly brought into the kiln system for incineration, and the energy consumption is large, resulting in limited treatment capacity.

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