A DENITRIFICATION METHOD OF WASTEWATER CONTAINING HIGH CONCENTRATION FLUORIDE AND NITRATE

摘要

PURPOSE: Provided is a denitrification method of wastewater containing high concentration fluoride and nitrate with a simple process. That can reduce the amount of sludge and can be applied even in a small area. CONSTITUTION: If fluoride content in wastewater is over 700mg/l, dose slaked lime of 2.5-3.0 equivalent weight compared with fluoride and perform process of flocculation, sedimentation and denitrification for removing deposits and remaining calcium ion and if fluoride content is below 700mg/l, perform denitrification process directly without dosage of slaked lime. The denitrification process is carried out under conditions of 6.0-7.0 of pH, 10-35°C of temperature.