Washing recycling treatment process of sludge from physical and chemical treatment and special apparatus for process

Abstract

The invention provides a washing recycling treatment process of sludge from physical and chemical treatment and a special apparatus for the process. According to the process, the sludge from physical and chemical treatment is treated by use of a method of primary dissolution, primary dehydration, secondary dissolution, secondary dehydration, third dissolution and third dehydration, and finally, the obtained inorganic sludge has the moisture content below 60%, and the content of each of potassium, sodium and chlorine in the inorganic sludge is reduced to about 0.06%; as a result, the obtained inorganic sludge can be used as a cement kiln ingredient; the environmental pollution and the floor area due to sludge landfill are reduced; meanwhile, impurity removal purification and evaporative crystallization are performed on the filtrate, and the obtained salt products can be sold to the outside; and as a result, the sludge recycling is thoroughly realized.

Description

technical field [0001] The invention belongs to the technical field of waste resource treatment, and specifically relates to a physical and chemical sludge washing resource treatment process and its special equipment. The physical and chemical sludge is dissolved, washed and dehydrated to reduce the dissolved salt content of the sludge, which can be used as The cement kiln ingredients are used, and the filtrate is purified and evaporated to crystallize at the same time to obtain salt products, which realizes the reduction and resource utilization of sludge. Background technique [0002] In the field of water treatment industry, especially in modern industrial wastewater treatment, due to the complex composition of wastewater, it is difficult to biodegrade, so physical and chemical methods are commonly used methods for wastewater treatment. However, in the process of physical and chemical treatment, a large amount of physical and chemical sludge is produced. Physical and chem...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a physical and chemical sludge washing resource recovery process and its special equipment for the technical defects of the existing sludge treatment technology, which is low in efficiency and prone to secondary pollution. The sludge undergoes a treatment process of primary dissolution, primary dehydration, secondary dissolution, secondary dehydration, tertiary dissolution, and tertiary dehydration. The moisture content of the finally obtained inorganic sludge is below 60%, and the potassium, sodium, and chlorine contents are uniform Reduced to about 0.06%, it can be used as cement kiln ingredients, reducing environmental pollution and land occupation caused by sludge landfill, and completely realizing the resource utilization of sludge

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