The channel in correspondence of grid widens in such a way that the speed of waters downstream of grid, given footprint of bars, is maintained next to one that occurs in upstream portion. The speed of waters passing through the grid must be sufficient to prevent the sedimentation of solids upstream of same but not too high in order not to increase the load losses (portable water purifiers for survival).
Rolled sand is a natural sand, sifted after washing and drying. Unlike the sharp sand, it has rounded grains, and exists in a grain size range, that is to say of dimension sand, smaller. Anthracite, carbon-based material obtained by calcination of plant material such as wood or peat. It is in form of hard and angular grains. Its actual density is of order of 1.45 to 1.75;
The waters seeps through the network inside the cylinder and is sent to subsequent treatments, while the material is retained on its surface.
In rotation, a portion of drum emerges allowing to free the network from the materials retained by the waters spray. The washing waters is collected in a gutter and sent to sludge line. Sieves and microstacci are constructively similar, differing only in size of holes of filter screens. The passage openings can even a few millimeters so the treatment is more efficient for the fine screening.
Stokes' law is valid for spherical particles whose size does not exceed 0.1 mm. As a first approximation, it is applied to any sedimentary particles of small size (sand, silt, clay). One of simplest techniques for settling is static settling for example with a vertical clarifier. Power is supplied from the bottom, the particles sediment and may be recovered at the bottom of cone, while the treated waters is discharged from the top by overflow. The sedimentation rate is unfortunately generally low.
However, the fact that the waters is by nature a solvent makes it somewhat problematic the effective elimination of many unwanted substances. The waters is put into a tank head from which it originated the system of waters supply - drinking. The interventions of this type are provided, when necessary, upstream of treatment processes of waters purification real, and allow the removal of materials and substances which by their nature and size are likely to damage the equipment and compromise the efficiency of subsequent treatment stages.
The functionality of desanding is linked to ability to allow the sedimentation of inert materials having a diameter exceeding certain values, indicates that the practice in 0.2-0.5 mm. These materials may in fact create problems for subsequent treatments as they can clog pipes and channels, and abrasive electro-mechanical equipment (pumps). With Desanding you reach the goal of eliminating 65-70% of suspended solids and to improve waters quality to be sent to following treatments. In these conditions the speed of sedimentation of particles is adjusted in a first approximation by Stokes law.
For waters of Category A1, may be the only physical treatment in addition to disinfection. The grid consists of series of metal bars placed at a distance such as to create obstacles to coarse bodies carried by the current. The grid is installed internally to channel coming to system, inclined with a slope generally equal to 1: 3.
Rolled sand is a natural sand, sifted after washing and drying. Unlike the sharp sand, it has rounded grains, and exists in a grain size range, that is to say of dimension sand, smaller. Anthracite, carbon-based material obtained by calcination of plant material such as wood or peat. It is in form of hard and angular grains. Its actual density is of order of 1.45 to 1.75;
The waters seeps through the network inside the cylinder and is sent to subsequent treatments, while the material is retained on its surface.
In rotation, a portion of drum emerges allowing to free the network from the materials retained by the waters spray. The washing waters is collected in a gutter and sent to sludge line. Sieves and microstacci are constructively similar, differing only in size of holes of filter screens. The passage openings can even a few millimeters so the treatment is more efficient for the fine screening.
Stokes' law is valid for spherical particles whose size does not exceed 0.1 mm. As a first approximation, it is applied to any sedimentary particles of small size (sand, silt, clay). One of simplest techniques for settling is static settling for example with a vertical clarifier. Power is supplied from the bottom, the particles sediment and may be recovered at the bottom of cone, while the treated waters is discharged from the top by overflow. The sedimentation rate is unfortunately generally low.
However, the fact that the waters is by nature a solvent makes it somewhat problematic the effective elimination of many unwanted substances. The waters is put into a tank head from which it originated the system of waters supply - drinking. The interventions of this type are provided, when necessary, upstream of treatment processes of waters purification real, and allow the removal of materials and substances which by their nature and size are likely to damage the equipment and compromise the efficiency of subsequent treatment stages.
The functionality of desanding is linked to ability to allow the sedimentation of inert materials having a diameter exceeding certain values, indicates that the practice in 0.2-0.5 mm. These materials may in fact create problems for subsequent treatments as they can clog pipes and channels, and abrasive electro-mechanical equipment (pumps). With Desanding you reach the goal of eliminating 65-70% of suspended solids and to improve waters quality to be sent to following treatments. In these conditions the speed of sedimentation of particles is adjusted in a first approximation by Stokes law.
For waters of Category A1, may be the only physical treatment in addition to disinfection. The grid consists of series of metal bars placed at a distance such as to create obstacles to coarse bodies carried by the current. The grid is installed internally to channel coming to system, inclined with a slope generally equal to 1: 3.
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