| 摘要 |
<p>A water purifier comprises a helical screw of sheet material carrying biologically active microorganisms. The helix is fitted around a horizontal, rotating shaft, and the outer periphery of the helix is tightly fitted within a cylindrical casing. End walls close off the casing, and a water inlet is provided in one end wall and a water outlet in the other, opposite end wall. Water traveling through the casing must traverse the helix surfaces and thus be subject to purification action, and cannot pass between the outer edges of the helix and the casing.</p> |
