continously working gravel filter / DynaSand Filter
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description: Continous working gravelfilter made of GRP with air lift pump, hopper bottom, switch cabinet and valve island made by NORDIC WATER.
| Producer: | Nordic Water |
| Typ: | DynaSand-Filter |
| Year of manufacture: | unbekannt |
| Pieces: | 1 |
| Condition: | gebraucht / used / second hand |
informations about: sand filters / gravel filters filter In chemistry and common usage, a filter is a device (usually a membrane or layer) that is designed to physically block certain objects or substances while letting others through. Filters are often used to remove solid substances suspended in fluids, for example to remove air pollution, to make water drinkable, and to prepare coffee. Some devices that are called filters may also carry out other processes, such as waste treatment, (e.g. biofilter). Several types of filters are used in chemistry in order to facilitate separation, thereby purifying a liquid (or gas). Many filters use gravity, or gravity enhanced by vacuum (suction) in order to create this separation, often through a funnel-shaped device. Filter efficiency can be improved in a number of ways, such as with the use of fluted filter paper. Other types of materials may be used to effect separations based on size, similar to filters, such as molecular sieves. The process of passing a mixture through a filter is called filtration. The liquid produced after filtering a suspension of a solid in a liquid is called filtrate, while the solid remaining in the filter is called retentate, residue, or filtrand. There are two types of filter media - a surface filter, a solid sieve which traps the solid particles, with or without the aid of filter paper (e.g. Büchner funnel, Belt press, Rotary vacuum-drum filter, Crossflow filters), and a depth filter, a bed of granular material which retains the solid particles as it passes (e.g. sand filter). The first type allows the solid particles, i.e. the residue, to be collected intact, the second type does not permit this. However, depth filters are less prone to clogging due to the greater surface area where the particles can be trapped. Also, when the solid particles are very fine, it is often cheaper and easier to discard the contaminated granules than to clean the solid sieve. Filter media can be cleaned by rinsing with solvents or detergents. Alternatively, in engineering applications, such as swimming pool water treatment plants, they may be cleaned by backwashing. Sand filters are used for water purification. There are three main types rapid (gravity) sand filters upflow sand filters slow sand filters All three methods are used extensively in the water industry throughout the world. The first two require the use of flocculant chemicals to work effectively whilst slow sand filters can produce very high quality water free from pathogens, taste and odour without the need for chemical aids. From Wikipedia, the free encyclopedia | ||||||||||||||||||||||
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