High-concentration organic salt-containing wastewater treatment method adopting steam recompression technology

Abstract

The invention relates to a wastewater treatment method, in particular to a high-concentration organic salt-containing wastewater treatment method adopting the steam recompression technology. The high-concentration organic salt-containing wastewater treatment method is characterized by comprising the steps of pretreatment, evaporation concentration, evaporation crystallization, crystallization separation and the like, wherein the evaporation concentration step is implemented according to the steam recompression technology: conveying wastewater into a mechanical recompression evaporator and concentrating the wastewater into a saline saturated or over-saturated solution through steam heating. According to the method, live steam is only fed into the mechanical recompression evaporator at the initial use, and the mechanical recompression evaporator can be used for recompressing secondary steam produced by wastewater evaporation, so that enough heat sources can be supplied to concentration of the subsequent fed wastewater, and the live steam is not required to be fed at the subsequent use; therefore, the energy can be greatly saved, and the treatment cost can be reduced.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating high-concentration organic salt-containing wastewater by using a vapor recompression technology. Background technique [0002] As we all know, high-concentration organic salt-containing wastewater is a difficult problem in wastewater treatment. Intermediate products such as pesticides, medicines, resins, additives, plasticizers, etc.) are widely present in many industries. The salt content of high-concentration organic saline wastewater is usually as high as 10% or more, and the organic content even exceeds 40%. [0003] The traditional method for the treatment of high-concentration organic salt-containing wastewater is the multi-effect evaporation crystallization treatment method. The pretreated wastewater is sent to the multi-effect evaporator, and the wastewater is heated and concentrated by the continuously flowing raw steam to turn it into a saturated ...

AI Technical Summary

Problems solved by technology

However, this multi-effect evaporation and crystallization treatment method needs to continuously feed raw steam into the multi-effect evaporator as a heat source for wastewater concentration, which requires a lot of energy consumption and high cost.

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