METHOD FOR THE REMOVAL OF MERCURY AND SELENIUM FROM WASTEWATER CONTAINING SULFATES

摘要

The present invention relates to a process for removing mercury and selenium from sulfate-containing waste water, in particular waste water from flue gas desulfurization plants. A problem with the removal of the aforementioned contaminants from waste water is that known processes are cost-intensive. In the cost-effective process according to the invention, a waste water volume V1 contaminated with mercury and selenium and with a known sulfate concentration is provided, b) BaSO4 is preciptated out from the provided waste water volume, a defined amount of Ba2+ ions being added to the waste water volume V1, c) the obtained BaSO4 is separated, a low-solid waste water being obtained, d) the low-solid waste water is guided over an ion exchanger to remove mercury, waste water having a reduced mercury content is obtained, and e) selenium and/or selenium compounds are removed from the waste water having a reduced mercury content. It is possible, in a technically simple manner in terms of processing, to remove the aforementioned contaminants from the waste water in a cost-effective manner and while observing strict limiting values, by using the process according to the invention