Multiple-effect evaporative crystallization equipment with pretreatment function and multiple-effect evaporative crystallization process are provided

Abstract

The invention discloses multiple-effect evaporative crystallization equipment with pretreatment and a multiple-effect evaporative crystallization process. Salt-containing wastewater is fed into a pretreatment unit for pretreatment, and a large amount of COD and colloids in salt-containing wastewater are removed by adding a medicament for mixing, reacting and filter-pressing operations to obtain clarified salt-containing wastewater; then the pretreated salt-containing wastewater is fed into a triple-effect evaporator and is concentrated, crystallized and then discharged into a crystal slurry tank, then crystal salt and mother liquor are separated through a centrifugal machine, and the mother liquor is fed back to a raw water tank. The pretreatment equipment comprises a reaction kettle and afilter press; a stock solution delivery pump and a medicament pump, a feeding hole of the stock solution conveying pump is connected with a stock solution tank; a feeding hole of the medicament pumpis connected with the medicament tank; wherein a discharge port of the reaction kettle is connected with a feed port of the filter press through a pipeline, a liquid discharge port of the filter pressis connected with a feed port of the salt-containing wastewater collection tank through a pipeline, a discharge port of the salt-containing wastewater collection tank is connected with a feed port ofthe feeding pump through a pipeline, and a discharge port of the feeding pump is connected with the multi-effect evaporative crystallization equipment through a pipeline.

Description

Technical field [0001] The invention relates to the technical field of industrial wastewater treatment equipment and industrial wastewater treatment, in particular to a multi-effect evaporative crystallization equipment and a multi-effect evaporative crystallization process provided with pre-treatment. Background technique [0002] Mixed wastewater containing high salt, high COD, and colloids mainly comes from the chemical, pharmaceutical and other fields. It contains a variety of substances, including inorganic salts, oil, organic total metals and radioactive substances. There are many ways to produce saline wastewater, and the amount of water is increasing year by year. The direct discharge of this kind of wastewater will lead to an increase in the mineralization of river water quality, causing more and more serious pollution to the soil, surface water, and groundwater, and destroying the ecological environment. Such hazardous waste disposal is difficult, with high investment,...

AI Technical Summary

Problems solved by technology

However, the existing crystallization evaporator not only has low crystallization efficiency, but also tends to cause incomplete crystallization of materials, resulting in waste, making it difficult to increase production output, and the utilization rate of steam is low, which in turn increases the energy consumption during the crystallization process.

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