A drive module which is a self-supporting structure being transferable and hoistable as an integral entity. The drive module includes a self-supporting framework having a shape of a rectangular parallelepiped. The self-supporting framework defines an inner space within the self-supporting framework. The drive module also includes at least two drive units. The drive units are supported to the self-supporting framework in the inner space of the self-supporting framework. The drive units are connectable to an external rotatable shaft for the rotation of the rotatable shaft located outside the drive module.

A flotation plant includes a tank module which includes a self-supporting framework having an inner space. The tank module includes at least one flotation tank. The flotation tank is disposed in the inner space of the self-supporting framework. The tank module is a self-supporting unit capable of being transferable and hoistable as an integral entity. The flotation plant includes at least two drive units for the rotation of drive shafts, each drive shaft being connected to a rotor for mixing and/or forming bubbles in the flotation tank. An overflow receptacle is disposed at the level of the upper part of the tank module for receiving an overflow from the flotation tanks. The flotation plant includes an overflow channel which is connected to the overflow receptacle for receiving and conducting the overflow from the overflow receptacle to a pumping means. The overflow channel is disposed outside the tank module.

A drive module which is a self-supporting structure being transferable and hoistable as an integral entity. The drive module includes a self-supporting framework having a shape of a rectangular parallelepiped. The self-supporting framework defines an inner space within the self-supporting framework. The drive module also includes at least two drive units. The drive units are supported to the self-supporting framework in the inner space of the self-supporting framework. The drive units are connectable to an external rotatable shaft for the rotation of the rotatable shaft located outside the drive module.

A water treatment device based on micro-nano bubble technology includes the micro-nano bubble generation device and the sewage tank, the sewage tank is also installed with water surface sewage collection mechanism and water surface sewage cleaning mechanism, the water surface sewage collection mechanism includes the pushing plate and the first transmission component, the pushing plate and the sewage tank are slidingly connected, and the pushing plate is also fixedly connected to the limit connecting rod, the water surface sewage cleaning mechanism includes the cleaning sieve plate and the sewage collecting box, and the cleaning sieve plate is vertically arranged inside the sewage tank, and the sewage tank is fixedly connected with the hinged table, the hinged table is connected with the first rotating shaft and the rear wall of the sewage tank is also equipped with the second transmission component.

A skimming mechanism for treating fluid includes a removably attachable frame and a conveyor traversing a length of the frame. The frame is removably attachable from a dissolved air flotation tank. The conveyor includes a chain and at least one scraper blade.