Dredging and classified dewatering treatment method and system for sludge in urban river box culvert

Abstract

The invention discloses a dredging and classified dewatering treatment method and system for sludge in an urban river box culvert. The method comprises the following steps: sucking high-organic matter bottom mud in the urban river box culvert through an environment-friendly silt remover, and conveying to an impurity removal device; removing impurities through the impurity removal device; pumping to a sand removal device; configuring a cyclone centrifugal separator and a screening machine by the sand removal device; removing over 90% of sand of which the particle diameters are greater than 74 microns; flowing the residual slurry into an efficient thickener; configuring a blending device by the efficient thickener; adding an environment-friendly flocculating agent when the slurry flows into the efficient thickener; fully mixing the slurry with the flocculating agent in the blending device, and discharging the supernatant up to the standard; collecting the bottom dense slurry into a dewatering and squeezing device through the pump; and entering the residual slurry of fine particles into the dewatering and squeezing device, and simultaneously adding an environment-friendly flocculation filter aid, wherein the moisture content of the squeezed mud cake is smaller than 40%; and the squeezed clear water is recycled as water for preparing a flocculating agent or recycled as rinse water.

Description

technical field [0001] The invention relates to dredging of urban inland rivers, in particular to a treatment method and system for dredging and graded dehydration of box culvert sludge in urban inland rivers. Background technique [0002] The transport method of dredging silt in urban river box culverts is towed by tank trucks to fish ponds, farmland, etc. for stacking, or converted from small boats to large ships, and then discarded in the open sea. This treatment method consumes a lot of energy, has low efficiency, occupies a lot of land resources, or affects marine resources. ,polluted environment. Therefore, the development of sludge dehydration and drying treatment technology is of great significance to the protection of the ecological environment. [0003] Sludge dehydration and solidification treatment method, application number 2011104062220.0, this patent relates to a sludge dehydration and solidification treatment method, but this patent does not have graded de...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a kind of sludge dredging and graded dehydration treatment of urban inland river box culverts in view of the defects in the prior art that the sludge treatment is not thorough, and the treated slag has a high moisture content and is not convenient for subsequent use. method and system

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