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A secondstage treatment, of the clarified effluent from the first stage, with lime to pH results in the formation of highly insoluble hydroxy apatite, Ca 5 (0H)(P0 4) 3 and fluorapatite, Ca 10 F 2 (P0 4) 6 complexes and thus the fluoride and phosphate concentrations are reduced to 10 mg/1 and 5 mg/1, respectively, in the final .
