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Precipitation and flocculation
Metals and particles remain in the condensate after gas cleaning and flue gas condensation. In order to release the condensate into the sea or lakes a water treatment is required, where metals, particulates, and dioxins can be separated. In this cleaning process the water is pumped into the reaction tank and the pH level is adjusted with NaOH (Sodium Hydroxide) to achieve optimal precipitation. With specially selected precipitation and flocculation chemicals, metals are precipitated as hydroxides and sulfides in precipitation and flocculation tanks. The precipitated and flocculated metals and particles are then separated in lamella separator and sand filter. Water treatment last step with activated carbon removes dioxins and if necessary , it can be used with a special carbon that also separates metals. Since water purification takes place in stages, the process can be adapted to the different fuel metal contents.
• Specially selected precipitation and flocculation chemicals are used to meet the demands of low metal content. For mercury, concentration as low as 1 µg/l is guaranteed.
• Use of NaOH at precipitation means that the need for maintenance is minimal.