Desulfurization wastewater zero discharge manufacturers: for you to talk about the introduction of desulfurization wastewater zero discharge related knowledge


Coal-fired generating units produce large amounts of flue gas containing sulfur dioxide, which is usually treated by wet desulfurization. Wet desulfurization has high efficiency, fast reaction and high utilization of desulfurizing agent. Limestone is often used as a desulfurization agent in engineering. However, this method of wastewater treatment is problematic and the quality of desulfurization wastewater is complex.

  It mainly contains suspended solids, sulfates, supersaturated sulfites, heavy metals and other impurities, many of which are strictly required to be controlled by national environmental regulations. It has become the most difficult wastewater to be treated in coal-fired power plants, and is the key to achieving zero wastewater discharge in coal-fired power plants. Faced with continuous desulfurization wastewater treatment, it is costly and difficult.

  Traditional desulfurization wastewater treatment technology has problems such as complicated process operation and low efficiency, so it is urgent to explore an effective and economic zero discharge process for desulfurization wastewater. At present, a number of zero-discharge desulfurization wastewater projects have been put into operation or are being implemented in China. There are many technologies related to zero-discharge desulfurization wastewater art.

  Mainly including pretreatment (except heavy metals, hardness, etc.), membrane concentration reduction, evaporation crystallization, flue evaporation, low-temperature flash evaporation, concentrated liquid perforation and other technologies. Under normal circumstances, the road desulfurization wastewater zero discharge treatment system is mainly divided into the following three processes: (1) pretreatment membrane concentration evaporation crystallization process; (2) pretreatment membrane concentration flue evaporation process; (3) low-temperature flash concentration liquid drying process.