Study On Pollution Characteristics And Control Countermeasures Of VOCs In Atmospheric Environment In Shijiazhuang City

In this paper,the pollution characteristics of VOCs in the ambient air of Shijiazhuang City were researched by using canister sampling/gas chromatography-mass spectrometry(GC-MS)method,and the species of characteristic pollutants and their temporal and spatial variations in the urban area were determined.Then the correlation analysis between VOCs and conventional pollutants was also carried out.Furthermore,the VOCs components and their sources were analyzed for wastewater treatment workshop and pharmaceutical factory area of a pharmaceutical park in Shijiazhuang City.Finally,the VOCs pollution control methods and approaches were given aiming at the volatile organic compounds characteristic factors of typical enterprises in the research project of county-identifying.According to the data analysis of typical national control points in Shijiazhuang,the results demonstrated that the proportion of halogenated alkane in characteristic pollutants was the highest.The seasonal variation of VOCs was Winter>Autumn>Summer>Spring,and the VOCs concentration in the morning was higher than that in the afternoon.In the study of the spatial variation of VOCs,it was pointed out that the order of the concentration of each point was New and High-tech Zone>Century Park>Southwest Higher Education.In the correlation research between VOCs and conventional pollutants,it was found that the correlation coefficiencets of VOCs and characteristic pollutants were higher and positively correlated with AQI,PM2.5 and PM10.While there was a negative correlation between VOCs,characteristic pollutants and O3.In the "sword-cutting" action,the concentrations of VOCs and characteristic pollutants during the control period were lower than that of the non-controlled period and the difference was significant.The source control and government supervision could be adopted in view of the environment VOCs control countermeasure,such as motor vehicle number limit and other measures.There were 60 kinds of VOCs components in the wastewater treatment workshop of Shijiazhuang pharmaceutical enterprise which had 5 kinds of characteristic pollutants.And there are 56 kinds of VOCs in pharmaceutical factory area which had 8 kinds characteristic pollutants.However,there are some unique VOCs components around some sampling sites in the both two place.In the typical enterprise research,the measured data were compared with the "emission control standards for volatile organic compounds in industrial enterprises of Hebei Province"(DB13/2322-2016).It was found that the total non-methane hydrocarbon in organized emissions exceeded the standard,such as in shoe-making industry and the printing industry.Furthermore,the non-methane total hydrocarbons in unorganized emissions exceeded the standard,such as in ink industry,printing industry and the shoe-making industry.Characteristic pollutants are n-hexane,dichloromethane,benzene,toluene,ethylbenzene and xylene.Thus,measures such as closed production technology and technology combination lamp measures could be adopted for enterprise VOCs.