Method and device for realizing wastewater zero discharging based on multiple-effect sound wave action

Abstract

The invention discloses a method and a device for realizing wastewater zero discharging based on a multiple-effect sound wave action. The method comprises the steps that low-pressure evaporation is performed on desulfurization wastewater in a form of atomization, vapour generated after the low-pressure evaporation is subjected to heat exchange by wastewater and is condensated and recycled, and the unevaporated wastewater is subjected to secondary evaporation; the device comprises a wastewater pre-heater, a wastewater heater, a low-pressure evaporator, a condensate water recoverer, a concentrated water treating pond, an underwater acoustic transducer and a pneumatic generator used for removing dust and scale in a flue, wherein the wastewater heater is connected with the low-pressure evaporator through a pipeline, a vapour outlet of the low-pressure evaporator is connected with the condensate water recoverer through the wastewater pre-heater, a wastewater outlet of the low-pressure evaporator is connected with the concentrated water treating pond, and the underwater acoustic transducer is connected with the wastewater pre-heater, the wastewater heater and the low-pressure evaporator. The method and the device provided by the invention have the advantage that evaporated gas and the wastewater subjected to the evaporation in a wastewater treating process are effectively treated and used, so that the purpose of wastewater zero discharging is realized.

Description

technical field [0001] The present invention relates to a method and device for zero discharge of waste water, in particular to a method and device for realizing zero discharge of waste water by using multi-effect sound waves. In the environmental protection field of metallurgy and other industrial waste water discharge treatment, the method and device for truly realizing zero waste water discharge are carried out by using the action of sound waves for low-pressure evaporation concentration and flue flash evaporation. Background technique [0002] Wastewater zero discharge is a comprehensive application technology that was first proposed, researched and applied by economically developed countries since 1970 and is still in progress. Internal recycling, no waste water is discharged to the outside, and the accumulated salts in the water circulation system are discharged in solid forms such as evaporation and crystallization. Because the power industry consumes a lot of water ...

AI Technical Summary

Problems solved by technology

This technology also has some disadvantages: when the waste water with high salt content is evaporated and solidified, it is easy to block the heat exchange tube, and the equipment system cannot run continuously

[0009] (1) The equipment consumes a lot of power, has poor stability, and occupies a large area;

[0010] (2) It is easy to scale and block. Once it occurs, it must be shut down for cleaning, so it is not suitable for materials that are prone to scaling (the concentration of chloride ions in desulfurization wastewater is extremely high);

[0012] (4) MVR can only produce concentrated liquid, and a crystallizer is required to increase investment costs;

Due to the failure to take appropriate treatment measures, the scale thickness in the flue can reach more than 30mm in one day (the actual measurement data of Shangdu Power Plant, the wastewater volume is about 6.4m 3 / h), which endangers the safe and stable operation of the unit; and if the dust attached to the flue wall is not cleaned in time, the hardness becomes very large and it is difficult to break and clean

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