From initial filtration
To remove large waste particles, we use e.g. curved screens and rotating drum filters. Flotation is used to separate fats, oils and solid particles smaller than 1 mm from the water. However, in many cases, coagulants, flocculants and neutralisers are needed to remove a higher percentage of pollutants from wastewater. Pollutants can be flocculated using a flocculator: this is a tubular reactor where chemicals are added to the wastewater under controlled circumstances.