Biological filter

Biological filter: what is it and why is it needed?

**Biological filter** - equipment designed to purify water from contaminants found in the aquatic environment or transferred into it by wastewater. As the name suggests, this is a filter whose operating principle is based on the ability of living organisms to destroy harmful substances. Biofilters have been used for decades to pre-treat wastewater before discharging it into a body of water or to achieve legally established drinking water quality standards. They consist of two compartments: the main one (where the process of biodegradation of contaminants occurs) and the auxiliary one.

***Purpose of the biological filter:*** * Purification of wastewater from residual organic matter; * Separation of substances according to their ability to oxidize; * Preventing the growth of microorganisms; * Preparation of water for reuse or discharge into a closed cycle; * Improving the quality of water before its use in recycling water supply systems. * A biological filter is used for the preliminary stage of biological wastewater treatment and significantly improves the quality of discharged (clarified) water. Filtered wastewater with a reduced content of harmful impurities can be discharged into natural reservoirs without additional treatment or used for a water recycling system. The effectiveness of wastewater treatment depends on many factors, the main ones being the type and number of microorganisms and the concentration of pollutants. With the correct selection of initial filtration materials, the purification rate can be increased to 95%. The main area of ​​application of biological filters is the construction of municipal wastewater treatment plants.