In recent years, with the introduction and implementation of a series of policies and regulations such as the New Environmental Protection Law, the Proposal of the State Council on Implementing Third Party Rectification of Air Pollution, and the Water Source Pollution Plan, improving the efficiency of tap water, maintaining water conservation, rational reuse of sewage, and even zero emissions have become inevitable choices.

In the power generation manufacturing industry, raw coal still accounts for about 70% of power generation, and nearly 90% of coal-fired power plants use the wet desulfurization process of dolomite gypsum. In the background image of zero emissions, the wastewater from the circulating system, RO reverse osmosis concentrated water, and the drainage pipeline of the chemical plant production workshop converge in the flue gas desulfurization tower during the production and manufacturing stage of the power plant. Therefore, flue gas desulfurization wastewater is the terminal equipment wastewater of power plants, and the poor water quality is the wastewater that is solved. Therefore, zero discharge of flue gas desulfurization wastewater can enable the water island of power plants to truly maintain the circulation system operation.

The composition and concentration value of flue gas desulfurization wastewater pose significant risks to the operation and management methods of the system software, and are crucial factors in the selection and corrosion of hazardous solutions for machinery and equipment. The flue gas desulfurization wastewater generally has many characteristics as follows:

(1) High salinity: TDS between 20000-60000mg/L

(2) High suspended solids: SS> 10000mg/L, highly susceptible to coal quality and load hazards

(3) High toughness: Ca2+at 1500-5000 mg/L, Mg2+at 3000-6000 mg/L, and CaSO4 at supersaturation

(4) The water is acidic: with a pH of 4-6.5, it is very easy to corrode pipelines

(5) Heavy metal exceeding the standard: Chemical substances such as mercury, chromium, cadmium, lead, arsenic, etc. are more common in heavy metal exceeding the standard, with some exceeding the standard

(6) Large fluctuation range of water flow rate: endangering the smooth operation of machinery and equipment

Based on the characteristics of wastewater mentioned above, the common flue gas desulfurization wastewater treatment process is "preparatory treatment+extraction+dry solidification". According to the requirements of salt production and manufacturing, if it is necessary to obtain special salt, a salt separation processing section can be added between preparation and extraction.

At present, the zero discharge technology of flue gas desulfurization wastewater in China is still in the stage of universal scientific research and basic application exploration. At present, the operating cost of zero emission technology is widely high, and the operating cost fee is relatively high. How to integrate current processing technologies, learn from each other's strengths and weaknesses, maintain low cost flue gas desulfurization with zero discharge of wastewater, and improve the comprehensive utilization rate of wastewater and mineral salts will be the top priority of future scientific research on zero discharge flue gas desulfurization.

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