A method for the removal of mercury from industrial wastewater

摘要

Mercury is removed from an industrial effluent by treating the effluent with a sulphide or hydrosulphite of an alkali metal in the presence of a flocculant at a pH of from 7 to 12 so as to precipitate an alkaline sludge containing precipitated mercuric sulphide and flocculated material, treating the alkaline sludge with effluent to redissolve the flocculated material but not the mercuric sulphide, and removing the mercuric sulphide.