Patent ID: 8734653
Filing Date: 2014-05-27
Classification: C02F

Abstract:
1. A method of removing mercury from industrial wastewater containing dissolved and particle-bound mercury comprising: introducing wastewater into a chelation tank, introducing a chelant into the chelation tank, mixing the industrial wastewater and the chelant and stripping mercury from undissolved particles from which the mercury was bound; introducing wastewater exiting the chelation tank into an oxidation tank, introducing oxidation agents into the oxidation tank, mixing the industrial wastewater and oxidation agents and further stripping mercury from undissolved particles by chemical oxidation; sample testing wastewater leaving the chelation tank by measuring total mercury and dissolved mercury and adjusting flow rates of chelants and oxidation agents if there are significant differences between the amount of total mercury and dissolved mercury; introducing wastewater that exited the oxidation tank into a covered chemical reduction tank, introducing a reducing agent into the reduction tank, mixing the industrial wastewater and reducing agent, and venting any vapor mercury formed in the oxidation tank to a volatile off-gas adsorption unit; and introducing wastewater that exited the reduction tank to an industrial vapor/liquid separation device, directing the separated vapor to the volatile off-gas adsorption unit, and directing the separated liquid to a remediated wastewater exit.