Integrated treatment method for thickening, drying and purifying municipal sludge

Abstract

The invention discloses an integrated treatment method for thickening, drying and purifying municipal sludge. The method comprises the steps as follows: the municipal sludge is concentrated in a sludge concentrating pool, and the concentrated submerged sludge is transported into a decanter centrifuge; a polyacrylamide cationic flocculating agent in a medicine adding box is added into the decanter centrifuge, wherein 2-3g of polyacrylamide is added into each kilogram of the submerged dried sludge, and solid particles in the submerged sludge are bonded together to form a plurality of particle groups, so that solid is separated from liquid to form a supernate and a mud cake; the mud cake is transported into a sludge treating place by a shaftless screw conveyer, and the supernate is transported to a sludge concentrating pool through a clear liquor pipeline by a water pump in a reflowing way; the supernate in the sludge concentrating pool is transported to the bottom of a filter by an overflowing groove through a pipeline; and the solid is separated from the liquid due to the centrifugal precipitation principle of the decanter centrifuge, the sludge with different charging concentrations is treated by less flocculating agent, and the physical filtering function and the physical absorbing function of the filler are abundantly acted, so that the municipal sludge and the wastewater produced by the municipal sludge can be synchronously treated.

Description

technical field [0001] The invention relates to the technical field of urban sludge treatment in the environmental protection industry, in particular to an integrated process of urban sludge concentration and dehydration, drying and water purification. Background technique [0002] In recent years, with the rapid development of the urban sewage treatment industry, the total amount of urban sludge has been increasing at an annual rate of 10%. The accumulated urban sludge not only occupies a large amount of land, but also contains various toxic and harmful substances such as heavy metals, organic pollutants, pathogenic bacteria, parasite eggs and odor, which seriously threaten the environment and ecological composition of the city. Therefore, it is necessary to Properly dispose of municipal sludge. At present, the conventional municipal sludge disposal process is divided into four stages, namely, sludge concentration→sludge digestion→sludge dehydration→sludge disposal, so tha...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of large area occupied by structures, low efficiency of traditional sludge concentration and dehydration, high water content and mechanical dehydration in the existing municipal sludge treatment process. Low efficiency, high moisture content of mud cake, easy to produce secondary pollution and other problems, provide a new integrated treatment method of urban sludge concentration dehydration, drying, water purification, so that urban sludge can be effectively treated, so as to realize the urban sewage Sludge resource utilization, applied in sewage treatment process, solves the problem of difficult sludge treatment in urban sewage treatment plants

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