Method and Apparatus for Treating Fluoride Ion Contained Wastewater and Regenerating the Wastewater

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PURPOSE : A processing method of fluorine-containing wastewater and a facility thereof are provided to drastically reduce fluorination cost by using a low price calcium based fluoridizing agent instead of an expensive rare earth fluoridizing agent and to reuse drain water and fluoridation at the same time.CONSTITUTION : A processing method of fluorine-containing wastewater comprises the following steps : materially removing calcium ion among effluent by passing fluorine-containing wastewater through cation exchange resins; and collecting processed water in which ion is removed by passing fluorine-containing wastewater in which calcium ion is removed through a reverse osmosis membrane and filtering remaining ion. The processing method additionally includes a fluorine processing step which injects fluoridizing agent into enriched water in which the remaining ion is filtered and concentrated and condenses fluorine among the enriched water. The fluoridizing agent is calcium based fluoridizing agent selected from CaCl2, Ca(OH)2, CaO, CaCO3 and a mixture thereof.[Reference numerals] (AA) Inlet water; (BB) Inlet water tank; (CC) Coagulant Alum etc.; (DD, TT) Congelation tank; (EE, UU) Polymer flocculant; (FF, VV) Cohesion tank; (GG, XX) Sludge; (HH, WW) Settling tank; (II) Process water control purpose; (JJ) Reverse osmosis filtration; (KK) Concentrated water; (LL) Precise/ultra filtration; (MM) Back washing water; (NN) Recycled water; (OO) Anion exchanging tower; (PP) Activated carbon; (QQ) Sand filtration; (RR) Concentration water tank; (SS) Ca fluoridizing agent; (YY) Discharging waterCOPYRIGHT KIPO 2013