PRETREATMENT METHOD AND TREATMENT FACILITY FOR WASTEWATER THAT CONTAINS FLUORINE AND SILICON

摘要

Provided is a wastewater treatment technology (in particular, pretreatment technology) that, in comparison to existing technologies, can reduce the quantity of sludge generated as a result of processing wastewater that contains fluorine and silicon. Before adding a calcium compound to wastewater that contains fluorine and silicon and performing coagulation-sedimentation treatment on said wastewater, as a pretreatment, sodium hydroxide is added to the wastewater (first reaction tank 1), sodium silicofluoride is precipitated, and the precipitate sodium silicofluoride is removed via solid-liquid separation (first sedimentation tank 2).