Method for removing heavy metal ions from wastewater of thermal power plant

Abstract

The invention belongs to the field of treatment of wastewater of thermal power plants, and particularly relates to a method for removing heavy metal ions from wastewater of a thermal power plant. Application of the method for removing the heavy metal ions from the wastewater of the thermal power plant is finished before desulfurization wastewater is introduced into recovery treatment, and the method comprises the following specific steps of: (1) introducing the desulfurization wastewater into a first fluidized bed from the bottom of the first fluidized bed which is filled with a quartz sand filter material, connecting the bottom of the first fluidized bed with a NaOH solution tank and a KMnO4 solution tank, and introducing a NaOH solution and a KMnO4 solution together into the first fluidized bed from the bottom of the first fluidized bed while the desulfurization wastewater is introduced into the first fluidized bed from the bottom; and controlling the pH value in the first fluidizedbed between 7.5 and 11 according to a conventional method. Through the method, the density of mud produced by the process can reach 2.5-3.0 kg / L, and the water content is less than 20% after dehydration is conducted; and when the method is compared with a traditional chemical precipitation method, the amount of the mud produced through the fluidized bed method is less than 25%.

Description

technical field [0001] The invention belongs to the field of thermal power plant wastewater treatment, and in particular relates to a method for removing heavy metal ions from thermal power plant wastewater. Background technique [0002] Heavy metals in industrial wastewater are the most harmful to the environment. After heavy metal wastewater undergoes multiple metal chemical and electrochemical processes, metal elements such as zinc, copper, chromium, nickel, and cadmium in the water appear in atomic valence and are directly discharged into the environment. , will endanger people's health through long-term cumulative effects. Minamata disease and Pain disease are caused by mercury-containing and cadmium-containing wastewater polluting the environment respectively. Therefore, effective measures must be taken to deal with heavy metal wastewater. [0003] The wastewater containing heavy metal ions in thermal power plants is mainly desulfurization wastewater, which contains ...

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Problems solved by technology

[0006] In order to effectively remove heavy metal ions in desulfurization wastewater, the present invention provides a method for removing heavy metal ions from thermal power plant desulfurization wastewater in view of the current problems of complex process routes and unstable operating conditions for removing heavy metal ions in desulfurization wastewater and the defects of solutions , using the method of the present invention can conveniently control the process conditions, especially improve the safe and stable operation quality of desulfurization wastewater treatment

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