When coal, lignite and wastes are combusted, flue gases are produced that need to be treated in accordance with authority requirements. This is done by „dry“ processes (fabric filters and electrostatic precipitators for dust) and „wet“ processes (flue-gas desulfurization).
The scrubbers remove acidic ingredients (HCI and SO2) and heavy metals from the flue gas by means of water and pH adjustment. Particular attention must be paid to mercury (Hg). Due to its volatility and toxicity, it is a very dangerous environmental toxin which must be reliably separated from the exhaust gas. It can be converted into a harmless compound by heavy-metal precipitation. Both the oxidised (ionic) mercury as well as the elusive elemental mercury must be precipitated and removed from the waste water.
To achieve this, the elemental mercury (Hg (0)) is oxidized to ionic mercury (Hg (II)) and precipitated as insoluble mercury sulfide (HgS). Other heavy metals, e.g. Zinc (Zn), lead (Pb) or cadmium (Cd) are safely detected and precipitated in this process of heavy-metal precipitation.
The precipitated heavy-metal sulfides can be safely and economically separated from the wastewater by means of our high-performance flotation system. The compact OKO-tech flotation systems are more effective and more space-saving than the lamella clarifiers commonly used. The use of OKO-aquaclean flotation plants pays off quickly for heavy-metal precipitation in flue gas treatment of power stations and incineration plants, be it a new waste water treatment plant or a replacement.
OKO-tech is at your service as a modular system supplier for your wastewater treatment plant - be it a new one, retrofitting or optimization. We offer design, turn-key assembling, commissioning and training.