| 摘要 |
In an electrolytic bath, an extraction part (17) extracts heavy metal in the internal organs of scallops into an acid solution. A direct current voltage is applied between electrodes (13, 14), which are provided in the acid solution, to deposit the heavy metal in the acid solution on the electrodes (13, 14). If the deposit efficiency deteriorates, the polarity applied between the electrodes (13, 14) is reversed from the polarity in the deposition of the heavy metal in a neutral or alkali electrolytic solution. Consequently, the heavy metal is removed from the electrodes (13, 14). Since arsenic is dissolved in the acid solution, an alkali liquid and a flocculant are added to the acid solution to sediment arsenic. <IMAGE> |
