Circulating water treatment combined device and process for realizing water saving and emission reduction of whole plant

Abstract

The invention relates to a circulating water treatment combined device and process for realizing water saving and emission reduction of a whole plant. The device comprises an open type cooling circulating water treatment unit and a circulating water treatment unit, wherein the open type cooling circulating water treatment unit comprises a first cooling tower, a circulating water treatment pond with electrochemical equipment, a first cooled unit and the like; the closed crystallization unit comprises a second cooling tower (closed cooling tower), an ECH microcrystal unit and a second cooled unit (service object), the ECH microcrystal unit is arranged at the bottom of the second cooling tower, and cooling water which flows down from the upper part of the second cooling tower and is treated by adding an ECH microcrystal agent into the ECH microcrystal unit is returned to the upper part of the second cooling tower through a first branch; and a second branch is further led out of the lower part of the second cooling tower to be connected with the second cooled unit and then returns to the top of the second cooling tower. Compared with the prior art, the method can meet the target requirements of water saving and emission reduction of the circulating cooling water system from the source, and has more prominent advantages compared with traditional circulating cooling water treatment.

Description

technical field [0001] The invention belongs to the technical field of water saving and emission reduction, and relates to a circulating water treatment combined device and process for realizing water saving and emission reduction in the whole plant. Background technique [0002] Coal chemical companies generally have environmental protection requirements for "zero" discharge of wastewater, and companies often invest huge sums of money in the construction of wastewater dehardening pretreatment, membrane concentration, evaporation crystallization and other equipment. The sewage of the circulating water system is one of the main incoming water of the sewage treatment unit. Together with other waste water, it enters the double membrane system after pretreatment. After re-treatment by the membrane concentration unit, the produced water is returned to the circulating water system, and the concentrated water enters the crystallization evaporation unit. In production and operation...

AI Technical Summary

Problems solved by technology

In production and operation, the double-membrane treatment unit, membrane concentration unit and evaporation crystallization unit all need to invest a lot of manpower and material resources to maintain the normal operation of sewage treatment facilities; excessive sewage treatment capacity and long sewage treatment process make the follow-up The production load of the treatment unit is relatively large, especially when the water quality of the circulating water system is abnormal and the amount of sewage replacement is increased, which will increase the production pressure of the sewage treatment system, increase equipment loss and maintenance costs, and ultimately result in high sewage treatment costs. No less, increasing the operating burden of the enterprise

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