Desulfurization wastewater zero discharge treatment technology
Release time：
2025-12-01 11:25:35
accomplishZero discharge of desulfurization wastewater, the key is to achieve the removal of chloride ions. Desulfurization wastewater has high hardness, poor stability, contains a large amount of heavy metals and high chlorine free radicals, is scaled and corrosive, and is also a technical difficulty in wastewater treatment. According to domestic industrial wastewater andZero discharge of desulfurization wastewaterApplication of technology, process systems are compared. according to convention300The operating parameters of megawatt thermal power units and the economic benefits were analyzed based on the addition of zero-discharge treatment of desulfurization wastewater. There are currently three main solutions:1)Desulfurization wastewater evaporation treatment technology;2)Spray flue gas evaporation treatment technology;3)High-salinity wastewater evaporation membrane treatment technology.
The type and content of pollutants in desulfurization wastewater are restricted to a certain extent by coal type, desulfurization process and method, flue gas dust content, limestone quality and dehydration effect, denitrification ammonia volatilization rate and other factors. The quality of desulfurization wastewater from the same generating unit varies greatly. In the treatment of zero discharge of desulfurization wastewater, the commonly used treatment process is desulfurization wastewater. The chloride ion concentration and salt content of this process are generally high. Corrosion and some scaling phenomena are prone to occur when the reclaimed water is reused, which seriously hinders desulfurization.
Zero discharge of desulfurization wastewaterWe mainly talk about two types of processing technologies:
One is the evaporation crystallization method, which can recover water resources and crystallized salts. High energy consumption is the main reason that limits its large-scale application. In addition, in order to ensure the normal operation of the evaporation crystallizer and the quality of the crystallized salt, strict pretreatment of desulfurization wastewater is required, such as removing hardness, organic matter and heavy metals in the wastewater. Therefore, in order to realize the large-scale application of the evaporation crystallization method, attention must be paid to the research and development of wastewater reduction pretreatment technology to reduce the construction and operating costs of the evaporation section. At the same time, high-efficiency desulfurization wastewater pretreatment technology must be studied.
Another method for zero discharge of desulfurization wastewater is flue evaporation treatment, which is simple to operate and has low operating costs. However, the flue treatment method cannot recover water resources and has many undetermined potential impacts, including the impact on subsequent dust removal and other processes, as well as possible flue corrosion problems. Therefore, in the zero-discharge flue gas evaporation treatment of desulfurization wastewater, attention should be paid to studying the impact of wastewater entering the flue gas on flue gas emissions and flue gas treatment systems. If flue treatment methods are to be widely adopted, a large number of long-term, complete economic and technical studies and evaluations are required.
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