In some systems, tanks contain a section known as the bio-selector, which consists of a series of walls or baffles which direct the flow either from side to side of the tank or under and over consecutive baffles. This helps to mix the incoming Influent and the returned activated sludge (RAS), beginning the biological digestion process before the liquor enters the main part of the tank.
In certain systems, tanks have a section called the bio-selector, which comprises a series of partitions or barriers that guide the flow either from side to side of the tank or under and over consecutive partitions. This facilitates the mixing of the incoming Influent and the returned activated sludge (RAS), initiating the biological digestion process before the liquor enters the main part of the tank.