Water Treatment Slow Sand Filter Diagram

Provides hydraulic head pressure to push water through the sand filter below.

Water treatment slow sand filter diagram. Some household treatment methods and their effectiveness are summa rized in table 6 1 whereas the following household and community water treatment technologies are described in greater detail. In the slow sand filter water entering first through about 32 36 inches of sand then through a multi size layer of gravel this layer is known as schmutzdecke which is german for dirty skin before entering the under drain. The top several inches of the sand has to be removed regularly usually by hand due to the mass of growing material schmutzdecke that collects in the filter. In a study water was obtained from sample taps of water treatment plants from three local reservoirs.

Crushed rock is the best type of filtration sand since it has less chance of being contaminated with pathogens or organic material. 1 4 hydraulic conductivities for slow sand filters 19 1 5 summary of designs of slow sand filters in europe as reported by hazen with units adjusted to fit those used in this manual 21 1 6 design criteria for slow sand filters for rural water supplies 26 2 1 present and projected flow data for village of 100 mile house bc 35. Water with high turbidity looks dirty due to sand silt and clay floating in the water. Under drainage system 4.

It is very old type water filtration or water treatment system. Slow sand filter biological filter elements of a slow sand filter 1. Well water in most cases needs only disinfection because it is already clear. Treatment qf raw water raw water is the term used to refer to water which needs treatment.

Surface water quite commonly needs coagulation sedimentation filtration and disinfection. The treatment required is not always the same. Users can maintain flow rate by cleaning the filter through agitating the top level of sand or by pre treating turbid water before filtration. Feed turbidity in one study ranged from 1 86 to 3 9 ntu.

The diagram below shows a simplified schematic of a sand filter. Bed of graded sand on a support of gravel 3. It poured through a slow sand filter and results showed that turbidity decreased to a mean of 1 45. Supernatant or raw water 2.

Lab effectiveness field effectiveness and health impact. Several types of filters are used for water treatment. Household water treatment systems boiling. A system of filter control valves 1.

The slow sand water filter in water treatment field slow sand filter is the large scale water filter. Distribute the water and prevent disturbing the sand near the filter wall. Early slow sand filters typically have filter rates of 0 05 gpm ft2 of surface area and require large filter areas. Depth varies from 1 1 5meters serves two important purposes.

A provides a constant head of water this overcomes the resistance of the filter bed. The key components of a slow sand filter are as follows.