Freshwater sources like rivers provide raw water that contains a lot of pollutants that make it unsafe; it must be eliminated. For this purpose, the waters will undergo a number of treatments needed to make it drinkable. The screening is the first step in a treatment process, which is to retain any large debris such as sticks, plastic bottles and cans (portable water purifiers for survival). To do this, it sets up a grid system, the spacing is about 50 mm. Once the gates are clogged with waste, a scraper rises along grids and knocked down the waste into a skip which, once full, is obviously to landfill.
In case where it is necessary to perform a removal of coarse solids thrust not settleable and suspended solids do not sediment is expected next to grilling also a sieving (or screening) or a microstacciatura. This type of intervention is normally alternative to primary sedimentation and also is also used for the removal of algae and plankton. The sieve consists of rotating cylinder (drum or noria) stainless steel horizontal axis, closed at its ends and partially immersed in a tank, on which is mounted a metal mesh also made of stainless material.
The waters seeps through the network inside the cylinder and is sent to subsequent treatments, while the material is retained on its surface.
These sources of supply, due to specific characteristics of waters and / or the degree of pollution, must be subjected to cycles of treatments of purification necessary to modify the characteristics and improve its quality. Often, this happens even for the deep waters with a high content of organic substances and a high microbial contamination, especially if they are present faecal bacteria (eg. Coliforms).
The purification is carried out by passing the raw waters (from rivers or lakes) through various types of implants removal of organic and inorganic material. The removal methods used can physical, chemical-physical and biological function of type of substances to be eliminated from raw waters entering the plant. The substances to be removed during the purifying treatment can of natural and man; the first type comprises.
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 first filtration principles were inspired by the natural filtering the waters passing through the different layers of Earth, before reaching the "underground tanks." Unfortunately, this process is far too slow to handle large amounts of waters. Note however that the thus filtered waters is often of excellent quality.
This law is valid for strictly spherical particles immersed in a liquid at rest and at constant temperature where the downward motion is not influenced neither by the presence of other particles or from the container walls. The sedimentation is carried out in special tanks, called decanters, within which the waters moves in a laminar flow as possible for a time sufficient to allow the sedimentation of heavier particles.
In case where it is necessary to perform a removal of coarse solids thrust not settleable and suspended solids do not sediment is expected next to grilling also a sieving (or screening) or a microstacciatura. This type of intervention is normally alternative to primary sedimentation and also is also used for the removal of algae and plankton. The sieve consists of rotating cylinder (drum or noria) stainless steel horizontal axis, closed at its ends and partially immersed in a tank, on which is mounted a metal mesh also made of stainless material.
The waters seeps through the network inside the cylinder and is sent to subsequent treatments, while the material is retained on its surface.
These sources of supply, due to specific characteristics of waters and / or the degree of pollution, must be subjected to cycles of treatments of purification necessary to modify the characteristics and improve its quality. Often, this happens even for the deep waters with a high content of organic substances and a high microbial contamination, especially if they are present faecal bacteria (eg. Coliforms).
The purification is carried out by passing the raw waters (from rivers or lakes) through various types of implants removal of organic and inorganic material. The removal methods used can physical, chemical-physical and biological function of type of substances to be eliminated from raw waters entering the plant. The substances to be removed during the purifying treatment can of natural and man; the first type comprises.
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 first filtration principles were inspired by the natural filtering the waters passing through the different layers of Earth, before reaching the "underground tanks." Unfortunately, this process is far too slow to handle large amounts of waters. Note however that the thus filtered waters is often of excellent quality.
This law is valid for strictly spherical particles immersed in a liquid at rest and at constant temperature where the downward motion is not influenced neither by the presence of other particles or from the container walls. The sedimentation is carried out in special tanks, called decanters, within which the waters moves in a laminar flow as possible for a time sufficient to allow the sedimentation of heavier particles.
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