Electrostatic precipitators have been used in many industries; several examples are cement, steel, aluminum, copper, ceramic, tile, petrochemical and power plant. An electrostatic precipitator is a large, industrial emission-control unit. They can handle large gas volumes with a wide range of inlet temperatures, pressures, dust volumes, and acid gas conditions. They can collect a wide range of particle sizes, and they can collect particles in dry and wet states. For many industries, the collection efficiency can go as high as 99.99%. Precipitators function by electrostatically charging the dust particles in the gas stream. Particles suspended in a gas enter the precipitator and pass through ionized zones around the high voltage discharge electrodes. The electrodes, through a corona effect emit negatively charged ions into the gas. The negatively charged gas field around each electrode charges the particles causing them to migrate to the electrodes of opposite polarity, i.e. the collecting electrodes. When enough dust has accumulated, the collectors are shaken to dislodge the dust, causing it to fall with the force of gravity to hoppers below. The dust is then removed by a conveyor system for disposal or recycling.