PURPOSE: To contrive the improvement of operating efficiency and the curtailment of expenses, labor and power and the maintenance of an equipment adapted for separation of muddy water, foul water and liquid or purification thereof and treatment of the resulting solid particles by preventing the blockage of the equipment which has been a hindrance to the improved operation and the automation of the equipment and removing blocking material therefrom.

CONSTITUTION: In the equipment adapted for separation of muddy water, foul water and liquid or the purification thereof and treatment of the resulting solid particles, a valve 5 or damper capable of opening an outlet 2 of a cyclone 31 to the outer side is used and actuated by power operation or an automatic system in response to output from a volmetric or floating type specific gravity balancing vessel 8 to form bypass passages 3 and 4, thereby, despite a temporary stopping of the water flow during operation, the main stream is maintained and easily adjustable and, thereby, the flow can be excited into vibration and fluid can be supplied to the bypass passages to remove blocking material therefrom. Also, the concn., dewatering and discharge of the liquid are made easy by the cyclone 31 or a settling tank. This apparatus permits the improvement of the operating efficiency, the curtailment of expenses, labor and power and the maintenance of the equipment and a combination with the conventional cyclone, settling device, etc., in series or parallel relation.