Cooling crystallization desalting system for high-salinity waste water

Abstract

The invention discloses a cooling crystallization desalting system for high-salinity waste water, which is characterized in that the system comprises a waste water storage groove for holding waste water. An outlet of the waste water storage groove is connected with a pipe-side inlet of a waste water heat exchanger; a pipe-side outlet of the waste water heat exchanger is connected with an inlet atthe lower part of a cooling crystallizer; the cooling crystallizer is provided with two outlets, that is, the upper outlet of the cooling crystallizer outputs a mother solution to a comprehensive wastewater pool, and the bottom outlet of the cooling crystallizer outputs crystal mush to a centrifugal machine; an upper outlet of the centrifugal machine outputs filtering liquid to the comprehensive wastewater pool, and a bottom outlet of the centrifugal machine outputs filtering residues to a salt recovery pool; a shell-side inlet of the waste water heat exchanger is connected with an external pipe outlet of a liquid-oxygen heat exchanger; an external pipe inlet of the liquid-oxygen heat exchanger is connected with an outlet of a glycol solution storage tank; an inlet of the glycol solution storage tank is connected with a shell-side outlet of the waste water heat exchanger; liquid oxygen is aerated to an internal pipe inlet of the liquid-oxygen heat exchanger; and an internal pipe outlet of the liquid-oxygen heat exchanger is connected with a supercritical water oxidization system.

Description

technical field [0001] The present invention relates to wastewater treatment technology, in particular to a cooling and crystallization desalination system for wastewater with high salt content (salt content > 3.5wt%) combined with supercritical water oxidation, using liquid oxygen as a cold source, especially those containing Treatment of inorganic salt (such as sodium sulfate) wastewater whose solubility decreases significantly with temperature decrease. Background technique [0002] Chemical industries such as petrochemicals, pesticides, pharmaceuticals and dyes, as well as meat and seafood processing industries discharge a large amount of high-salt, high-concentration, biodegradable organic wastewater during production. Practice has shown that when conventional biological treatment technology is used to treat high-salt wastewater, it is necessary to dilute this type of wastewater and control the salt content of the incoming water below 1%. However, to achieve the abov...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new process that utilizes liquid oxygen as a cold source, crystallizes and precipitates inorganic salts in waste water through cooling, and then realizes desalination of waste water through centrifugation, which can effectively solve the problems of the existing desalination process of high-salt waste water. The problem of high energy consumption during efficient evaporation, as well as problems such as corrosion and scaling of equipment

Images