介质阻挡放电等离子体活化水除尘灭菌OA

To address the dual challenge of dust and microbial pollution in underground coal mines,this study proposed a dust removal and sterilization technology of plasma-activated water(PAW)based on dielectric barrier discharge(DBD).The variations in the physicochemical properties of PAW were systematically investigated under different treatment powers(ranging from 300 to 500 W)and treatment times(ranging from 30 to 150 s).Its bactericidal performance was evaluated using the colony counting method.Through experiments on surface tension,contact angle,droplet size,and simulated roadway dust capture,the effects of PAW on the wettability of coal dust and dust suppression efficiency were analyzed.The results indicated that the reactive oxygen species and acidic environment in PAW can act synergistically to enhance the sterilization.At 500  W and 150  s,the sterilization rates of Escherichia coli and Staphylococcus aureus reached 99.99％and 99.9％respectively.The logarithmic reduction values of colonies are 3.15±0.15 and 2.94±0.21,respectively.Compared with pure water,PAW exhibited a 9.6％reduction in surface tension and a 39.74％decrease in Sauter mean diameter(SMD).For hard-to-wet anthracite dust,the contact angle decreased significantly with longer treatment time.The total and respirable dust suppression efficiencies of the plasma-activated water mist are increased by 32.2％and 37.5％,respectively,than those of pure water spray..In summary,PAW technology offers a green and efficient solution for integrated dust control and microbial disinfection in underground mining environments.