大气PM2.5颗粒湿法捕集技术研究

Study on wet method for collecting PM2.5 particles in atmosphere

在探究用水或者液滴来捕集空气中PM2.5颗粒的湿法捕集新技术的基础上,设计并制造出基于直接水洗和雾化水洗技术的湿法捕集装置。用动态光散射技术对获取的PM2.5样本溶液进行测试,得到样本的平均光子数、PM2.5颗粒粒径等参数,以表征湿法捕集技术的可行性以可靠性。实验结果表明:样品粒径大小均在200~400 nm之间;平均光子数随实验时间增加而增加;湿法捕集技术可行可靠;相对于直接水洗技术,雾化水洗技术能显著提高湿法捕集的效率。

This paper studies a new wet method for collecting PM25 particles in the air with water or droplets.Based on direct water washing method and atomized water washing method,wet collect device was designed and produced.The obtained PM25 sample solution was tested by dynamic light scattering technique to get the average photon number of the sample and the PM25 particle size to characterize the feasibility and reliability of the wet method.The experimental results show that the measured particle size ranges from 200 to 400 nm,the average photon number increases with the increase of experimental time.The wet method is feasible and reliable.Compared with the direct water washing method,the atomized water washing method can significantly improve the efficiency of wet method.