Comprehensive utilization process of city sludge in sintering brick making

Abstract

The invention discloses a comprehensive utilization process of city sludge in sintering brick making. The process comprises the following procedure steps: processing city sludge, and performing raw material crushing and screening with a brick making sintering material; performing mixing; performing aging; manufacturing blanks; performing piling; performing sintering in a kiln; and performing cooling and warehouse storage. As city sludge treatment is recombined and designed, the city sludge is firstly converted into a regenerated fuel, the regenerated sludge fuel is combined with the building material sintering industry and is used as one of raw materials of sintered building materials, finally the sludge can be treated and converted into sintered bricks, a novel mode is created in additionto a landfill treatment mode of city solid wastes, the landfill amount can be reduced, demands on land resources can be greatly reduced, original wastes can be turned into wealth, and resource utilization of wastes can be achieved.

Description

technical field [0001] The invention relates to the field of urban waste treatment and disposal, in particular to a comprehensive utilization process of urban sludge in sintering to make bricks. Background technique [0002] As the country pays more and more attention to environmental protection, the country has successively issued a series of related environmental protection policies. Urban sludge is a chronic disease that has long plagued urban environmental governance. At present, the main treatment method of urban sludge in China is the landfill method. This method requires relatively little investment, but it needs to occupy land. At the same time, there are many harmful substances in the sludge that have not been eliminated for the time being. When it is directly buried, it needs to invest in waterproof and anti-seepage construction. Otherwise, it will cause secondary pollution to the environment and groundwater sources, and the pollution source has not yet been elimin...

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Problems solved by technology

At present, the main treatment method of urban sludge in China is the landfill method. This method requires relatively little investment, but it needs to occupy land. At the same time, there are many harmful substances in the sludge that have not been eliminated for the time being. When it is directly buried, it needs to invest in waterproof and anti-seepage construction. Otherwise, it will cause secondary pollution to the environment and groundwater sources, and the pollution source has not yet been eliminated; secondly, the urban sludge is also dried and incinerated, land composting, and anaerobic digestion. The investment and operation costs of incineration equipment are high, and the dioxins in the fly ash and flue gas produced after direct incineration are difficult to deal with, so it is difficult to promote in our country; the use of land composting is in an aerobic environment, and microorganisms convert sludge Fermentation treatment is carried out to obtain organic fertilizers. Various heavy metals in the sludge cannot be transformed and directly enter the growth link of plants, which is very harmful to humans; anaerobic digestion uses bacteria and anaerobic bacteria to perform biochemical reactions, and the sludge produced The biogas treatment method has a long transformation cycle and cannot be used for large-scale industrial treatment. At the same time, the newly generated biogas residue is more difficult to dispose of due to the accumulation of pollutants.

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