| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain high denitrification effect by a charcoal type water purification apparatus. <P>SOLUTION: The water purification apparatus 20 is provided with a body vessel 22 containing a purification tank 25 comprising charcoal 24, a submerged pump 34 for passing water to be treated to the purification tank 25, and a control device 44 controlling the submerged pump 34. The control device 44 intermittently operates the pump 34. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
