Thermal destruction of wastes (incineration) produces flue gases containing particulate matter (dust, ash). To prevent these particles from being released into the atmosphere and causing air pollution, specialized devices are used to clean the flue gas. An electrostatic precipitator (ESP) is an effective particulate collection device that uses an electrostatic force to separate particles from a gas stream. The particles are charged and then collected on charged plates before the cleaned gas is released. Other options are incorrect: A) Air conditioner: Used for cooling and dehumidifying indoor air, not for industrial flue gas cleaning. B) Bioreactor: Used for biological treatment processes, such as wastewater treatment or composting, not for filtering dust from incineration gases. C) Ventilator: A device for moving air, typically for circulation or exhaust, not for removing particulate matter.