Technical methods for coal mine wastewater treatment system

　　Technical methods for coal mine wastewater treatment system

　　Physical processing methods

　　Physical processing methods include precipitation, filtration, and flotation processes. These methods mainly remove suspended solids and particulate matter from wastewater through physical means. The sedimentation method uses gravity to separate solid substances in wastewater, the filtration method removes smaller particles through a filter screen, and the flotation method raises suspended solids to the surface through bubbles. These methods are usually used as primary processing steps to improve the efficiency of subsequent processing.

　　Chemical treatment methods

　　Chemical treatment methods mainly include coagulation, precipitation, and redox reactions. These methods utilize chemical reactions to remove pollutants such as heavy metals and organic matter from wastewater. The coagulation method aggregates pollutants into large particles by adding chemical agents, which facilitates sedimentation. The oxidation-reduction reaction changes the chemical properties of pollutants by adding oxidants or reducing agents, thereby removing their toxicity.

　　Biological treatment methods

　　Biological treatment methods utilize the metabolic processes of microorganisms to remove organic pollutants from wastewater. Common biological treatment methods include activated sludge process, biofilter process, and sludge concentration process. The activated sludge process involves mixing sewage with activated sludge and utilizing the metabolic activity of microorganisms to degrade organic matter. The biological filter method involves setting up a filter bed to allow sewage to come into contact with microorganisms when passing through the filter layer, thereby removing pollutants.