The following three basic methods can usually be adopted: sewage treatment:
Pre -treatment (pre -processing): Preliminary treatment refers to preliminary treatment of sewage to remove large particles and suspension. This usually includes the use of grids, sand sink ponds, adjustment pools and other equipment. Through pre -processing, the impact of subsequent processing equipment can be reduced, and the effects and stability of subsequent processing can be improved.
Bio -treatment: Biotrophy is the process of degradation and transformation of organic substances in sewage by microorganisms. The most common method is the Activated Sludge Process. It contacts and reacts with the sewage containing microorganisms with mixture containing microorganisms to remove organic substances and pollutants. Other biological treatment methods also include anaerobic digestion, fixed biofilms.
In -depth treatment (post -treatment): Deep treatment is the process of further purification and removing residual pollutants for pre -processing and sewage after biological treatment. Common depth treatment methods include technologies such as precipitation, filtration, and membrane separation. The sedimentation uses gravity effects to settle the suspension and colloidal substances to the bottom, thereby purifying the water body; filtering the water through the medium to remove the tiny particles and suspension; the separation of the membrane is separated through the filtering of the membrane to separate the pollutants.
These three basic methods are usually used in combination to form a complete sewage treatment system. The specific treatment process and equipment configuration will be different due to different sewage sources, water quality requirements and processing scale. In practical applications, some advanced technologies, such as oxidation and adsorption, can be used to further improve the treatment effect and water purification.