Desulfurization wastewater zero-discharge treatment system and method

Abstract

The invention discloses a desulfurization wastewater zero-discharge treatment system and method. The desulfurization wastewater zero-discharge treatment system comprises an adjusting tank, an integrated pretreatment device, a microfiltration device, a nanofiltration device, a high-pressure reverse osmosis device, an ultrahigh-pressure reverse osmosis device, a horizontal pipe falling film concentration device and an evaporative crystallization device; wherein the adjusting tank, the integrated pretreatment device, the microfiltration device, the nanofiltration device, the high-pressure reverseosmosis device, the ultrahigh-pressure reverse osmosis device, the horizontal pipe falling film concentration device and the evaporative crystallization device are sequentially connected in the treatment direction of desulfurization wastewater. Zero discharge of wastewater is achieved, the scale of an evaporation system is reduced, the energy consumption of an evaporation crystallization processis reduced, the purity of crystalline salt is improved, the pretreatment process flow is simplified, and the floor area and equipment investment are reduced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a zero-discharge treatment system and method for desulfurization wastewater. Background technique [0002] In order to remove sulfur dioxide in flue gas, more than 90% of coal-fired power plants in my country use limestone gypsum wet desulfurization process. Various types of wastewater from power plants are often used as process water for desulfurization systems. Therefore, the desulfurization wastewater generated by the desulfurization system is the terminal wastewater of the power plant. It has the characteristics of small water volume, complex components, and difficult treatment. Due to the increasingly prominent problems of water resource reuse and environmental protection, zero discharge of desulfurization wastewater is becoming more and more necessary. [0003] The main factors affecting the water quality of desulfurization wastewater include the type of coal ...

AI Technical Summary

Problems solved by technology

Due to the shortcomings of large investment and high cost of steam evaporation crystallization process, it affects its wide-scale promotion

In recent years, the mainstream steam evaporation technology used in engineering is vertical mechanical vapor compression evaporation (MVR). There are still problems of large investment and high operating costs

In addition, the front-end softening pretreatment process of wastewater has the problems of long process and many nodes

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