Patent ID: 7329357
Filing Date: 2008-02-12
Classification: C02F,Y10S

Abstract:
1. A method for removing fluorine from wastewater, comprising: settling wastewater for settling heavy suspended solids and for permitting floating of light suspended solids on the surface of the wastewater, and subsequently removing the heavy and light suspended solids; removing metal ions in the wastewater by adjusting the pH value of the wastewater by adding a pH-adjusting agent into the wastewater in an amount such that the pH value of the wastewater ranges from 6 to 10 so as to precipitate metal hydroxides through reaction of the metal ions with hydroxide ions in the wastewater, and filtering the wastewater to remove the precipitate of the metal hydroxides from the wastewater; adding a fluorine reactive agent NaAlO removing the precipitate of sodium aluminum fluoride from the wastewater, wherein the precipitate of sodium aluminum fluoride has a formula of Na