Disclosed is a dental treatment of waste water by utilizing the flow rate and efficiency sedimentation rate of the noble metal well, to efficiently recover metals from waste water in dental treatment. A metal powder generated during dental treatment contains the liquid (waste water) in order to recover the metal powder, a box-shaped collector body 12 which opens upward, the injection port 17 for injecting the waste water on the upper surface is attached, a lid member 13 for removably closing the opening of the collector body 12, the collector body 12, is attached to form a plurality of individual collecting tank is lower than the depth of the collector body 12 further comprising using a plurality of partition plates 18, the metal recovery unit 11 made from a metal having a small particle size from a large metal powder particle size is precipitated in the order of each individual collection tanks, metal powders of different particle sizes in a wide range me to recover in the individual by collecting tank. [Selection Figure] Figure 1【課題】歯科治療排水の流速と貴金属の沈降速度を効率よく利用することで、歯科治療の排水中から金属を効率よく回収する。【解決手段】歯科治療時に生じた金属粉が含有する液体(排水)から金属粉を回収するために、上方に開口する箱状の回収器本体12と、上面に排水を注入する注入口17が取り付けられ、回収器本体12の開口を着脱自在に閉止する蓋体13と、回収器本体12内に、複数の個別捕集槽を形成するために取り付けられた、回収器本体12の深さより低い複数の仕切り板18と、から成る金属回収器11を用いて備え、粒径の大きな金属粉から粒径の小さい金属を各個別捕集槽の順番に沈降させ、広範囲に異なる粒径の金属粉を該個別捕集槽において回収する。【選択図】図1
