SAND FILTRATION

Sand filtration

1. Upper Service Hole
2. Filter Inlet
3. Anthracite Layer
4. Fine Sand Layer
5. Coarse Sand Layer
6. Filter Outlet
7. Gravel Support Layer
8. Filter Element
9. Side Service Hole

Filtration with pressure filters featuring various filtration mediums is applied in a wide range of applications during the processes of drinking water treatment, chemical disinfection and during the pH and EC regulation.

Filtration taking place through the filtration bed of pressure filters [known as fine filtration] removes especially turbidity, colloid substances, undesirable colour or odour, microbiological contamination, ammonia ions, iron, manganese from water and it reduces water acidity as well.

For the purpose of a proper removal of these substances from water and to obtain the requested quality of output water it is necessary to propose a suitable filtration process. The actual filtration through pressure filters is complemented with aeration, clarification, coagulation, static mixers, disinfection. The kind of the filtration medium used is very important as well.

Sand filtration is a process in which the treatment of the water is realised by the 'porous' nature of a sand layer which traps particles present in water. Various other physical/ biological processes also take place in a sand filter which further strip the water of different substances (deferrisation, demanganisation, ammonium removal).
 
Sand filtration is frequently used in the treatment of groundwater to remove dissolved iron. Iron and manganese in the groundwater are oxidised by aeration and the flocs formed are subsequently trapped in the sand filter. After a certain period of time, the filter is saturated with particles and must be cleaned to prevent it from blocking up completely. Sand filters are cleaned by backwashing with air and/or water.

Logisticon manufactures standard or client-specific coated steel filter tanks varying from 1.2 to 3.1 metre in diameter for its rental fleet and for specific projects.

Logisticon manufactures both sand and activated carbon filters, in steel, under its own management. The models available vary in bed height and diameter of the filter material (nozzles), etc. Basically, a filter consists of a steel body with two low pressure floors, and a bottom plate which is welded onto the body and in which the wash heads are mounted.

Besides the many sand and activated carbon filters manufactured for specific purposes (environmental technology, process and waste water) in our rental fleet, we also make customised filter tanks. In addition to the various dimensions specified by the client, such as the diameters of the tank and connecting pipes, various options are possible in terms of integrated feed and washwater drainage pipes, an extra manhole, aeration/distribution system, type of coating (KIWA quality mark), etc.