Energy-saving evaporation treatment process of high-salinity wastewater

Abstract

The invention provides an energy-saving evaporation treatment process of high-salinity wastewater. The energy-saving evaporation treatment process comprises an evaporating system, a concentrating system, a drying system and a heat circulating system. Grading preheating, heating evaporation, adsorption purification, concentration, adsorption purification and high-temperature drying are successively carried out on the high-salinity wastewater treated by a wastewater treatment system to obtain the finished product of inorganic salt, heat exhausted in the evaporation, concentration and drying processes is recycled, and wastewater is discharged. By adopting the technical scheme, wastewater discharged finally meets the national industrial wastewater discharge standard, the purity of the obtained inorganic salt is as high as 99.3%, and the energy-saving effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to an energy-saving evaporation treatment process for high-salt wastewater. Background technique [0002] The wastewater discharged during industrial production often contains high concentrations of inorganic salts, especially the by-products of inorganic salts in the chemical production process or the large amount of inorganic salts produced by neutralizing the pH of the solution, which will lead to higher concentrations of inorganic salts in the final discharged wastewater. High-salt wastewater has the characteristics of large discharge, strong toxicity and high difficulty in treatment. [0003] At present, the commonly used treatment methods are multi-effect evaporation followed by flaking with a flaker or spray granulation followed by drying in a fluidized bed. However, these methods often consume a large amount of energy such as steam, electr...

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Problems solved by technology

[0003] At present, the commonly used treatment methods are multi-effect evaporation followed by flaking with a flaker or spray granulation followed by drying in a fluidized bed. However, these methods often consume a large amount of energy such as steam, electricity or coal, and the production cost is high. , and the final evaporated inorganic salts often contain crystal water, which has high impurity content and is difficult to effectively use, and the final discharged wastewater is also difficult to meet the standard

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