The EpF process is also especially suited for the splitting of stable emulsions, for example drilling and cutting oil emulsions or wastewater from washing processes, which is otherwise frequently effected by adding demulsifiers. Separating emulsions with membranes, particularly by ultrafitration, does create a recyclable permeate but the costs for acquisition and running are high. In thermal processes, the aqueous phase is evaporated and the oil phase is retained as a concentrate but here the energy demands are extremely high. Metallic salts such as FeCl3 are used to separate solids from suspensions, and are responsible for oversalinating water. It is imperative to dose polymers exactly since overdosing makes them act as emulsifers. Electro-physical precipitation is an alternative innovative process for separating stable emulsions and suspensions without having to add chemicals.
Halving the treatment costs for paper wastewater
For a paper manufacturer we optimized the plant for purification of the process wastewater and increased its capacity. We replaced conventional flocculation with a plant on the principle of electro-physical precipitation. By saving chemicals such as flocculants, polyelectrolytes and caustic soda it was possible to reduce the costs for the wastewater treatment by half.
Removal of finely suspended substances from paint wastewater
In a feasibility study for an aircraft manufacturer we successfully treated paint wastewater from the painting systems by means of electro-physical precipitation. The clouding of the wastewater was reduced by 95 percent, the COD (chemical oxygen demand) value by 75 percent. Similar studies were carried out for paint manufacturers. Here too, we were able to show that it was possible to reduce the clouding, the COD value and the smell significantly.