AIR Quality Control Treatment of Emissions

AIR Quality Control Selection of treatment devices will be depend on : 1- size of Air pollutant 2- Type of Air pollutant, such as SO2 can clean by water spray but the result is corrosion problem. Therefore, are divided into different types for Air pollutant control process.

AIR Quality Control Where: Xo X1 X2 Where: Xo : Amount of pollutant entering the device per unit time (kg/s) X1 : Amount of pollutant collected by treatment device per unit time (kg/s) X2 : Escaped particles (kg/s)

AIR Quality Control Where: R: Treatment device removal efficiency Concentration of emission will be equal to the mass per volume. Principles of mass balance will be valid for this process

AIR Quality Control EX: An air pollution control device is to remove a particulate that is being emitted at a concentration of 125000 µg/m3 at an air flow rate of 180 m3/s. the device removes 0.48 ton per day. What are the emission concentration and the collection recovery?

AIR Quality Control Cyclone Collector Cyclones provide a low cost, low maintenance method of removing larger particulates from a gas stream. Mechanism 1- The particulate is forced to change direction. 2- The particles continue in the original direction and be separated from the stream. 3- The walls of the cyclone narrow towards the bottom of the unit allowing the particles to be collected in a hopper. 4- The cleaner air leaves the cyclone through the top of the chamber.

AIR Quality Control Cyclone are efficient in removing large particles but are not sufficient with smaller particles. For this reason, they are used with other particulate control devices. Proper disposal for the collected material is needed. why? Collected solid particles are most often disposed off in a landfill.