The invention discloses a device and a method for
groundwater defluorination . The device sequentially comprises a water inlet unit, a clarifying unit and a filtering unit from bottom to top, wherein the water inlet unit comprises a water inlet
pipe, a coagulating agent dosing port, a
powder hydroxyapatite dosing port and a water distribution device; all reagents and
raw water are fully mixed in the water distribution device; a suspended
sludge layer is arranged in the clarifying unit, and a
sludge discharge port is arranged at the upper part of the suspended
sludge area; and a filtering material is filled in the filtering unit. The
raw material, a coagulating agent and
powder hydroxyapatite are respectively dosed into the water distribution device of the water inlet unit via the water inlet
pipe, the coagulating agent dosing port and the
powder hydroxyapatite dosing port, mixed, then driven to go upwards, input into the clarifying unit, further conveyed to the filtering unit from a filter plate at the top after being clarified by the suspended sludge layer of the clarifying unit and discharged from a water outlet after being filtered by the filtering material of the filtering unit, and the residual sludge is discharged by the sludge
discharge port. According to the device and the method disclosed by the invention,
fluoride ions in
groundwater can be economically, effectively and safely removed, the
water quality needs not to be regulated again, the process is simple, and the
water quality of outlet water is ensured.