Desulfurization wastewater treatment system and method

Abstract

The invention relates to a desulfurization wastewater treatment system. The system comprises a pretreatment unit, a filter unit, a first-stage reverse osmosis unit, a second-stage reverse osmosis unit and an evaporation crystallization unit which are connected sequentially, wherein the first-stage reverse osmosis unit comprises a water feed pump, a cartridge filter, a first-stage high pressure pump, an energy recovery device and a first-stage reverse osmosis device; the second-stage reverse osmosis unit comprises a second-stage high pressure pump and a second-stage reverse osmosis device; the filter unit, the water feed pump, the cartridge filter, the first-stage high pressure pump, the first-stage reverse osmosis device, the energy recovery device, the second-stage high pressure pump and the second-stage reverse osmosis device are connected sequentially; the first-stage reverse osmosis device and the second-stage reverse osmosis device are provided with first-stage and second-stage water production ends respectively. A permeate water drainage system is formed by adopting the pretreatment unit, the filter unit and the two stages of reverse osmosis units, pressure energy of first-stage concentrated water is recycled, and a small amount of concentrated water is obtained; zero emission is realized, the amount of the concentrated water treated by the evaporation crystallization unit and the size of equipment are greatly reduced, the cost is saved, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment system and method for desulfurization wastewater. Background technique [0002] The flue gas produced by coal-fired power plants contains a lot of sulfur dioxide, and the direct emission is very polluting to the environment. Therefore, it is necessary to desulfurize the flue gas to achieve clean production and environmental protection. The commonly used gypsum wet desulfurization technology has a good desulfurization effect, but the wastewater produced by it has the characteristics of high salt content, high turbidity, high COD and heavy metals. With the improvement of environmental protection requirements, coal-fired power plants will not allow For any waste water discharged externally, desulfurization waste water treatment must undergo strict treatment to achieve zero discharge. [0003] At present, the conventional desulfurization wastewate...

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Problems solved by technology

Patent CN201410852359 discloses an anti-scaling evaporation crystallization treatment process and system for wet desulfurization wastewater in coal-fired power plants. Poor performance; and the components in the wastewater are complex, the maintenance of evaporation and crystallization equipment is difficult, and problems such as low evaporation efficiency are prone to occur after continuous operation

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