Online Effluent Quality Monitoring System In Hyderabad

Working Principle

The working principle of a Pressure Sand filter is very straight forward. In a Pressure sand filter, water is gone through multi layers of filter media comprising reviewed sand, rocks and rock layers. The contaminants in the water are caught in the media bed and sifted water goes into the release manifold at the base of the tanks. The following step is discharging, a procedure of adequately expulsion of caught contaminants from the media bed. After back washing, the filter is flushed with raw water and after the required nature of water is accomplished the filter is returned to support. Sand filtration is frequently used and very robust method to remove suspended solids from water. The filtration medium consists of a multiple layer of sand with a variety in size and specific gravity. Sand filters can be supplied in different sizes and materials both hand operated or fully automatically. Raw water pump is used for generating necessary operating pressure in the pressure sand filter. Raw water is passed through RWT Pressure sand filter at a pressure of 3.5 kg / cm2 to reduce the suspended solids present in the raw water. The filter will effectively remove up to 30 � 50 micron of the suspended solids to less then 5 ppm. The filter will have to be washed with raw water for 20 to 30 minutes daily. To filter the partials below 30 � 50 micron cartridge filter is used. 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.

Process

Raw water flows down wards through the filter bed and as the suspended matter, which is treated by addition of a coagulant like alum or poly electrolyte, is retained on the sand surface and between the sand grains immediately below the surface. There is steady rise in the loss of head over a period of time and the flow reduces once the pressure drop across the filter is excessive.

The filter is then taken out of service and cleaning of the filter media is effected by flow reversal also called as backwash. To assist in cleaning the bed, the backwash operation is sometimes preceded by air scouring by way of agitation through the under drain system. The air scouring agitates the sand with a scrubbing action, which loosens the intercepted particles. The filter is now ready to be put back into service.

The areas of application include: