Abstract
In 2017, the Ministry of environmental protection issued the technical policy on pollution prevention and control of thermal power plants (Guide to feasible technologies for pollution control in thermal power plants: HJ 2301, 2017), proposing to encourage the use of evaporation drying or evaporation crystallization and other treatment processes to ensure that desulfurization wastewater is not discharged. Desulfurization wastewater of thermal power plant, as the terminal wastewater of the whole plant, has the characteristics of high salt, high suspended solids, high heavy metal, and large fluctuations in water quality and quantity (Zhang et al. in J Shanghai Electr Power Univ 37(S1):64–66, 2021). It is one of the most difficult problems to achieve zero discharge of wastewater from power plants. This paper takes the zero discharge transformation of desulfurization wastewater in a thermal power plant as a case, compares and selects different schemes of pretreatment unit, thermal concentration unit and solidification unit, and puts forward the best scheme.
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