Patent ID: 7182873

Claim:
A method of fluoride-containing wastewater treatment, comprising: performing a primary fluoric ion concentration detection process upon wastewater, the primary fluoric ion concentration detection process comprising: providing a buffer solution having a stable pH value; adding a fixed amount of the wastewater into the buffer solution; detecting a fluoric ion concentration in the buffer solution; and estimating the amount of fluoride contained in the wastewater; introducing the wastewater into a first reaction tank, and performing a primary calcium salt addition process to add calcium salt into the first reaction tank so that fluoric ions contained in the wastewater react with the calcium salt and form calcium fluoride, a dosage of the calcium salt added in the primary calcium salt addition process being determined according to the fluoric ion concentration detected in the primary fluoric ion concentration detection process; introducing the wastewater and the calcium fluoride into a second reaction tank, and performing a secondary calcium salt addition process to add calcium salt into the second reaction tank so that fluoric ions remaining in the wastewater react with the calcium salt and form calcium fluoride; performing a solid-liquid separation process to separate the calcium fluoride from the wastewater; performing a secondary fluoric ion concentration detection process upon the wastewater after the calcium fluoride is separated; and adjusting a dosage of the calcium salt added in the secondary calcium salt addition process according to a fluoric ion concentration detected in the secondary fluoric ion concentration detection process.