| 摘要 |
<p>PROBLEM TO BE SOLVED: To miniaturize the device and to surely prevent the occurrence of reddish water by falling an iron component containing waste water to a water storage tank holding a bacteria holding means and provided with an iron oxidizing bacteria through a falling weir and storing the water in a prescribed amount. SOLUTION: The falling weir 13 having a prescribed height is formed at the top end of a flow passage of the iron component-containing waste water 11, and the water storage tank 14 is arranged at its downward side. The waste water 11 falling from the falling weir 13 is stored by a prescribed amount. A horizontal board 18 is fitted at the bottom part side of the water storage tank 14 and the bacteria holding means 19 on which the iron oxidizing bacteria is stuck is mounted thereon. A negative electrode 20 is arranged adjacently to this bacteria holding means 19. A positive electrode 21 is arranged at the upward side of the negative electrode 20 and at the underside of water surface. A spontaneous oxidation is accelerated by falling the waste water 11 from the falling weir 13, and the change of the iron from bivalent to tervalent is accelerated with the iron oxidizing bacteria, and the occurrence of the reddish water is prevented by this constitution.</p> |
