H+E has made a name for itself with its biological-aerobic processes for waste water treatment, particularly in the food & beverage, pulp & paper and oil & gas industries. With these processes, the waste water is treated in one or more stages in such a way that it can be eventually discharged directly into a body of water.

By adding oxygen, microorganisms convert biodegradable substances, measured as BOD₅ or COD, into biomass, carbon dioxide and water. This reaction can occurin biofilm processes or activated sludge processes. But not only these substrates are degraded. Special bacteria convert ammonium into nitrate. Nitrate is then turned into gaseous nitrogen. This process is known as nitrification and denitrification. It removes unwanted nitrogen compounds from the treated waste water (BIOFIT®.N). For heavily polluted waste water, pre-treatment with a moving bed bioreactor process is recommended (BIOFIT®.H).

Biofiltration (BIOFIT®.F) is often the method of choice for lightly polluted waste water. For very stringent limit values or water recovery, a membrane bioreactor (BIOFIT®.M and BIOFIT®.Watercell) is a space-saving and reliable solution.