tailieunhanh - Indoor and Outdoor Air Pollution Part 5

Tham khảo tài liệu 'indoor and outdoor air pollution part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Development and Evaluation of a Dispersion Model to Predict Downwind Concentrations of Particulate Emissions from Land Application of Class B Biosolids in Unstable Conditions 31 analytical solution given by Sutton 1953 to predict the concentrations for ground level area sources. The new model has been evaluated using the data collected in 2009 and the regression equation given by Brooks et al. 2005 based on their field work. 3. Field sampling study In the summer of 2009 a field study was conducted to collect particles emitted during the land application of biosolids. Particle emissions were collected for three days during the application application and for two days after the application post-application of biosolids. An agricultural field scheduled for application of Class B biosolids in Northwest Ohio was selected for the sampling. The biosolids were applied on this field by injection method. Particle samples were collected via the use of two GRIMM aerosol samplers operating at airflow of l minute. The gravimetric data in 16 channels over the size range pm d 20 pm was collected for a total of six hours every sampling day. The samplers were placed onto specially arranged tables raised to a height so that the intake nozzle was at average human breathing height of m. Two sampling stations one station inside the field and one outside were selected. The location of the outside sampling station at 10 m downwind from edge of the field was changed to 20 m downwind after first three hours of sampling keeping the location of the inside station same throughout the sampling. The monitors were reoriented in the direction of the wind if needed. The weather data were collected using a portable weather station at both sampling locations inside and outside. The atmospheric parameters defining the atmospheric stability for each hour of sampling on each sampling day are presented in Table 1. The location of outside concentration monitoring station for each hour .

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