Study on the Removal of Heavy Metals From Wastewater by Ultra High Lime With Aluminum Precipitation Coupling Activated Carbon Adsorption in 300 MW Coal-Fired Units

doi:10.12096/j.2096-4528.pgt.23103

Abstract

Abstract:

Objectives The wet flue gas desulphurization of coal-fired power plants generates a large amount of wastewater containing heavy metals, the removal of heavy metals from wastewater by coupling of limestone and sodium metaaluminate precipitation and activated carbon adsorption were studied. Methods The optimized feed ratio, temperature, and pH value for the precipitation method were obtained, and the experimental parameters for the type of adsorbent and adsorption layer height were optimized. Based on this, engineering tests were conducted on the 300 MW unit of Sanhe coal-fired power plant. Field experiments were conducted with an additional precipitator feeder and adsorption device, and effect was investigated. Results The optimal feeding rate is 160 kg/h, the flow rate is 1 m³/h, and the adsorption height is 10 cm. Under the experimental conditions, the overall heavy metal removal efficiency is significantly improved. Compared with the heavy metal content in the original export of the power plant, the removal efficiency of lead, chromium, copper, and nickel from the export increase by 33.24%, 81.93%, 35.22%, and 57.52%, respectively, after installing a mixed precipitation and adsorption device. Conclusions The method of coupling of limestone and sodium metaaluminate precipitation and activated carbon adsorption can effectively promote the removal of heavy metals from desulfurization wastewater, providing guidance for the deep removal of heavy metals in the wastewater from coal-fired power plants.

Key words: coal-fired units, desulfurization wastewater, heavy metal, ultra-high lime with aluminum, activated carbon, adsorption

CLC Number:

TK 09

Gengsheng LIU, Jianyong ZHANG, Quan SUN, Shan CAO, Anqi GONG, Lin JIANG, Yongsheng ZHANG. Study on the Removal of Heavy Metals From Wastewater by Ultra High Lime With Aluminum Precipitation Coupling Activated Carbon Adsorption in 300 MW Coal-Fired Units[J]. Power Generation Technology, 2024, 45(5): 959-968.

Figures/Tables 12

Fig. 1 Sampling sites, and coupled sedimentation and adsorption experimental procedures

Fig. 2 Field experiment setup diagram

Fig. 3 Effect of feed ratio and temperature on Pb removal

Fig. 4 Effect of feed ratio and temperature on As removal

Fig. 5 Effect of feed ratio and temperature on Se removal

Fig. 6 Comparative experiment of adsorbents

Fig. 7 Simulation experiment on optimum adsorption height of activated carbon

Fig. 8 Original heavy metal removal efficiency of Sanhe Power Plant

Fig. 9 Effeet of different feeding rates on the removal efficiency of heavy metals

Fig. 10 Effect of different wastewater flow rates on the removal efficiency of heavy metals

Fig. 11 Effect of different bed heights on the removal efficiency of heavy metals

Fig. 12 Heavy metal removal efficiency under optimal conditions

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