Zero-discharge crystalline salt treatment process and device for high-salt wastewater

Abstract

The invention discloses a salt crystallizing processing technology and device for zero discharge of high salt wastewater. The technology mainly comprises processes of preprocessing, evaporation, crystallization, carbonization and the like; a crystallizer mainly comprises a cylinder body, a double-horn shaped cylinder body, a washing tube, a cleaning port, a monitor, a mixing agitator and a heating device; firstly, the mixing agitator is subjected to relative preprocessing operations, then wastewater enters an evaporator, low-pressure steam provided by the outside is used for evaporating and crystallizing salt-containing wastewater in evaporator bundles, after the evaporation process is finished, the salt-containing wastewater is crystallized by the crystallizer, finally, organic matters and nitrate in the crystallized salt are removed in a carbonization stove, exhaust gas of the carbonization stove enters a combustion system, high temperature flue gas heat of the carbonization stove is subjected waste heat recovery, and low-pressure steam generated by a waste heat boiler is used as steam for external supply of the crystallizer. According to the salt crystallizing processing technology and device for zero discharge of the high salt wastewater, the high salt wastewater is further processed, the water recovery rate can reach 95% or above, at the same time, solid salt is crystallized, and zero discharge of high salt wastewater is realized.

Description

technical field [0001] The invention relates to a process for treating crystalline salt, in particular to a process and device for treating high-salt wastewater with zero discharge of crystalline salt. Background technique [0002] As the country pays more attention to environmental protection, it begins to control the total amount of discharge. General sewage can be discharged up to standard through biological and chemical treatment technologies. However, for a large amount of high-salt wastewater produced by national pillar industries such as petrochemical, coal chemical, electric power, oil extraction, and mining, only 75% to 85% of the wastewater can be recovered through traditional methods such as chemical, membrane, and reverse osmosis. 15% to 25% of the high-concentration saline wastewater has not been effectively treated so far, and some are stored in exposure tanks. In the event of mountain torrents, geological disasters, etc., once the high-concentration saline was...

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Problems solved by technology

[0004] In addition, unlike the traditional salt chemical evaporation and crystallization process, the crystallization salt treatment of high-salt wastewater is difficult to accurately obtain the physical parameters of the wastewater system due to the complexity of the wastewater composition and the fluctuation of water volume, resulting in process design parameters that deviate from the actual system. The medium device cannot run stably for a long period of time, especially the crystallization device, which is often shut down due to blockage

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