the media bed will act as a combined contactor and filtration bed.

Biological activity in the filter bed for targeted secondary treatment

This prevents small sized particles from getting through the filter bed.

A second filter media bed (110) may be formed above the first filter media bed.

By passing water through a “filter bed,” or “media bed,” these granular particles are trapped—and clean, purified water passes through the bed.

By passing water through a "filter bed" or "media bed", these granular particles are trapped and clean water passes through the bed.

By passing water through a “filter bed,” or “media bed,” these granular particles are trapped – and clean water passes through the bed.

The flyash is captured on the first frusto-conical surface and within the bed mass.

The filtration bed may include an adsorption layer or area that contains a phosphorus adsorptive granular media.

A system for treating turbid water in which the turbid water to be treated is caused to pass through a filter bed into a storage area, the water flow being such as to ensure a sufficient residence, time in the bed.

The processed gas flows out through the second frusto-conical surface and then through the second filter bed, if present.

The thus obtained pre-polymer is then granulated and dried with a heat carrier, for example air, consecutively under regimes of pneumatic transport, cyclone, fluidized bed and filter bed.

Also disclosed are means for adjusting the angle of inclination of the filter bed and mechanical means for removing solids from the filter elements.

Sand is able to remove small-sized organic and inorganic solids, due to the effect of electrical forces caused by friction as the water passes through the filter bed.

In one embodiment, the filter bed is disposed within an upper unit mounted for rotation on the tank floor to facilitate cleaning of the filters.