Sludge treatment system and sludge treatment method

Abstract

The invention discloses a sludge treatment system and a sludge treatment method, and the sludge treatment system comprises a dehydration module used for dehydrating sludge; the drying module is used for drying the dewatered sludge; the pyrolysis combustion module is used for pyrolyzing the dried sludge and combusting a pyrolysis product; the tail gas treatment module is used for carrying out purification treatment on the flue gas discharged by the pyrolysis combustion module; wherein the pyrolysis combustion module is provided with a pyrolysis cavity for performing anaerobic pyrolysis on dried sludge, and a combustion cavity for combusting pyrolysis products; the pyrolysis combustion module comprises at least one external oxygen supply unit, and if the number of the external oxygen supply units is at least two, the at least two external oxygen supply units are used for supplying oxygen at different positions in the flowing direction of pyrolysis products in the combustion cavity. According to the sludge treatment system, secondary pollution is effectively reduced, and the harmless degree and the reduction degree of sludge treatment are improved.

Description

technical field [0001] The present invention relates to the technical field of sludge treatment, and more particularly, to a sludge treatment system and a sludge treatment method. Background technique [0002] Sludge, as the residual product of the municipal sewage treatment plant in the sewage treatment process, has high water content, bulky, perishable, foul smell, and may also be accompanied by toxic and harmful substances such as heavy metals and bacteria. If the sludge is directly discharged into the external environment without disposal, it will cause great harm to surface water, groundwater, soil and air, and ultimately bring adverse effects on human health and the overall environment. Therefore, it is very important to reduce, stabilize and harmless treatment and disposal of sludge. [0003] At present, the main disposal methods of sludge are: landfill method, composting method, sludge brick making method and incineration method. Among them, the landfill method wil...

AI Technical Summary

Problems solved by technology

Among them, the landfill method will occupy a large amount of land in the city and cause secondary pollution; the composting method will produce secondary pollutants such as fermentation waste liquid; The cost of flue gas treatment is high, the sludge transfer pollution is serious during the preparation process, and the transportation cost is high; the secondary pollution of the incineration method is serious

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