Desulfurization waste water zero discharging system and process for realizing in-house by-product recycling treatment

Abstract

The invention discloses a desulfurization waste water zero discharging system and a process for realizing in-house byproduct recycling treatment. The system comprises a flue gas desulfurization system, a desulfurization waste water zero discharging pretreatment system and a desulfurization waste water zero discharging advanced treatment system, wherein the flue gas desulfurization system comprises a desulfurization tower, a gypsum hydrocyclone, a vacuum belt dehydrator, a waste water hydrocyclone and a backflow water tank; the desulfurization waste water zero discharging pretreatment system comprises a raw water pit, a primary reaction tank, a primary clarifier, a secondary reaction tank, a secondary clarifier and a clean water tank which are sequentially connected; the desulfurization waste water zero discharging advanced treatment system comprises an ultrafilter, a pH adjustment tank, a nanofilter, a nanofiltration water tank, a reverse osmosis part, a concentrated water tank and a strong brine electrolyte sodium hypochlorite device which are sequentially connected. According to the system and the process provided by the invention, byproducts produced from the desulfurization waste water zero discharging system are separated according to different components, and the desulfurization waste water zero discharging system is combined with a power plant original water treatment system, so that the waste is turned into wealth, and the in-house byproduct recycling is realized.

Description

technical field [0001] The invention relates to a water treatment system and a process, in particular to a zero-discharge system and process for desulfurization waste water in which by-products are disposed of as resources in a plant. Background technique [0002] The desulfurization wastewater produced by the limestone-gypsum process in thermal power plants contains high concentrations of Cl - , SO 4 2- 、Na + , Ca 2+ , Mg 2+ , is a typical high-salt, high-hardness wastewater. At present, most domestic and foreign coal-fired power plant desulfurization wastewater zero discharge projects adopt the "softening + advanced treatment" process route. Since the desulfurization wastewater itself contains a large amount of suspended matter, a large amount of sediment will also be generated during the softening process, and a large amount of sludge will be generated during the pretreatment process. This part of by-products has complex components and low utilization value, and ca...

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Problems solved by technology

[0004] It can be seen that the current zero-discharge process for desulfurization wastewater only solves the problem of wastewater discharge. The large amount of solid waste generated by the zero-discharge system can only be landfilled, which not only greatly increases the operating cost of the system, but also does not make rational use of resources. The zero emission of the project is not in line with the original intention of the zero emission project

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