Sludge deep dehydration process

Abstract

The invention discloses a sludge deep dehydration process which comprises the following steps: (1) adding a modifier and a catalyst to sludge of which the moisture content is 80-85%, and performing stirring and uniform mixing; and (2) conveying the modified sludge into a sludge deep dehydrator, and sequentially performing low-pressure, medium-pressure and high-pressure filtration and dehydration treatment. The sludge deep dehydration process disclosed by the invention has the following advantages: the sludge is quantified through a spiral conveyer, the homogenized sludge is conveyed into a mixing reactor, the sludge modifier and the sludge catalyst are quantitatively added, the homogenized sludge and the sludge modifier and the sludge catalyst are fully mixed under the action of mechanicalstirring, and the modified sludge is quantitatively conveyed into the sludge deep dehydrator through the spiral conveyer so as to be extruded and dehydrated, thereby realizing the deep dehydration ofthe sludge. The moisture content can be reduced to be 60% or lower by performing dehydration once.

Description

technical field [0001] The invention relates to the technical field of sludge dewatering technology, in particular to a deep sludge dewatering technology. Background technique [0002] Sludge is a solid sediment produced in the process of water and sewage treatment. It has a high water content, which can be as high as more than 99%. It also contains a large amount of nutrients such as nitrogen, phosphorus, and potassium that promote the growth of plants and crops. Treatment can achieve the purpose of stabilization, harmlessness and resource utilization. [0003] However, due to the high content of organic matter, it is easy to rot and smell, and the particles are finer, the specific gravity is smaller, and it is in a colloidal liquid state. It is a thick substance between liquid and solid, which can be transported by pump, but it is difficult to separate solid and liquid by sedimentation. In addition, sludge is used as a composting raw material, and the moisture content of...

AI Technical Summary

Problems solved by technology

[0004] At present, in the sludge dehydration operation, in a closed state, the sludge injected by the high-pressure pump is squeezed by the plate and frame, so that the water in the sludge is discharged through the filter cloth to achieve the purpose of dehydration; the moisture content of the mud cake after dehydration 65% to 80%, low efficiency

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