Treatment process and treatment system for municipal sludge

Abstract

The invention discloses a treatment process and a treatment system for municipal sludge. The treatment system is arranged outside a decomposing furnace, is connected with the decomposing furnace and cement plant equipment, and comprises a sludge drying system, an out-of-furnace pre-sintering system and a steam generation system, the steam generation system is connected with the sludge drying system, and the out-of-furnace pre-sintering system is connected with the sludge drying system and the steam generation system respectively. According to the treatment process, the processes of sludge heating, water evaporation, organic matter incineration and the like are transferred into the pre-sintering furnace and are completed, the furnace capacity of the decomposing furnace is not occupied, conditions are created for large-scale cooperative sludge treatment of a cement kiln, recycling of sludge is achieved, and final treatment of sludge is also achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge disposal in the field of environmental protection, and in particular relates to a disposal process for municipal sludge and a disposal system thereof. Background technique [0002] With the continuous increase of urban population and the improvement of domestic sewage treatment rate, the output of municipal sewage sludge is also increasing. The environmental pollution of municipal sludge has become the focus of public attention. Municipal sludge is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. It contains a large number of pathogenic bacteria and parasites (eggs), heavy metals such as copper, zinc, chromium, nitrogen, phosphorus, etc. Salt, salt, and polychlorinated bibenzene, dioxin and other toxic and harmful substances that are difficult to degrade. Sludge also contains high levels of attached and bound water. Therefor...

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Problems solved by technology

[0007] 3. Direct incineration

The disadvantage is that the sludge has a large moisture content, and its calorific value is almost zero or even negative calorific value. During the process of sludge temperature rise and water evaporation, part of the furnace capacity of the calciner is occupied, which indirectly or directly affects the production of cement clinker. Therefore, It is difficult to achieve large-scale disposal of sludge by spraying and burning in cement kilns

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