PURPOSE: To obtain a method and equipment where uniform agitation and floc formation are made in saving energy adding a inorganic flocculant to liquid to be treated, rapidly agitating the mixture, introducing it into a passage where plates with plural holes made alternatively in the upper and lower parts are arranged, and making flocculating separation by agitation using water head energy.
CONSTITUTION: Raw water to which a inorganic flocculant is added is rapidly agitated, causing particles to collide and associate with each other to form micro flocs of several tens μm diameter. Then the raw water is introduced into a passage 1 where plates 3 with holes 3a made in the upper and lower halves are alternatively arranged at prescribed intervals. When the raw water passes through the holes 3a made in the plates 3, water head energy lost by the conversion of water head energy of the raw water to vortex energy and the flow of the raw water taking a long, up-and-down way is used for agitation. The diameter and number of the holes 3a of each plate 3 and the number of the plates 3 are properly determined so that strong agitation may be given in the upstream side and that moderate, uniform agitation may be given as the water goes to the downstream side. Thereby the destruction of flocs and the settling deposit of grown flocs in the passage 1 are prevented.
NAKAMURA HIDETO
OGAWA MASANORI
| JPS484933A |