| 摘要 |
<p>A purification system has a process tank with an inlet and an outlet, where water containing organic material and nutritive salts is purified during circulation in the tank. Purification is performed biologically in that the tank contains so-called activated sludge with microorganisms which absorb organic material and nutritive salts. The activated sludge is separated in a sedimentation device, which is arranged in the actual process tank and is provided with a lamella section having substantially parallel lamella plates. The water is thereby caused to flow over the lamella plates before leaving the process tank, whereby the sludge settles. Water flows between the underside of the sedimentation device and the bottom of the process tank, whereby the settled sludge is moved away and is mixed with the circulating water.</p> |
