- Filtration of biologically treated sewage or industrial wastewater as a polishing stage to reduce furthermore the concentration in suspended solids and organic load
- Filtration of borehole water for iron and manganese removal
- Filtration of cooling water to prevent heat exchanger fouling
- Filtration of potable water
The filtration process is straightforward. Water is pumped at a predetermined pressure and flow rate before it passes through the filtering unit. The filtering unit consists of the vessel (usually made of carbon steel, stainless steel or grp), the filtering media (depending on the incoming water and the expected results these can be gravel, sand, anthracite, granular activated carbon or other).
Water enters the top of the vessel, flows downwards through the bed of media and leaves through an outlet at the bottom. Solids and contaminants are either retained or absorbed depending on the chosen media.
The backwash water enters the bottom of the filter vessel and flows upwards through the media bed, which starts to fluidize, that is the media grains begin to separate from each other and float freely. The fluidization of the media releases the retained or absorbed contaminants, a process which may be assisted by bubbling air through the bed (air scouring) which causes the sand grains to rub against each other dislodging the retained or absorbed contaminants from the surface. The contaminants are then washed of the filter bed and released out of the filter vessel to waste.
MBR research project 30.03.2012
Zephyros No.4 sewage treatment plant 30.03.2012
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