The raw feed water being pressurized is allowed to enter the sand-filter-tank top after a strainer in-line of make-up water supply line. We have facility of one in service and other standby line for make-up water supply. Any maintenance or other jobs in water lines allow the smooth operation by other. A connection is also given to brine water pump for its priming and to soda plant facility for dilution and operational need. All the three sand filter tanks remain in operation/ running. The bottom furnishes the turbidity-free or much lowered TSS (Total Suspended Solids) feed water. A hosepipe taken from filters discharge serves in brine solution preparation by supplying raw water to the brine pit. Details of filters are as follows
Name Permutit Filters
Filter Media Anthracite
Pressure in 70 Psi
Pressure out 50 Psi
Temperature Ambient
Picture shows a cutaway view of a pressure filter. The construction of this filter is very similar to that of the gravity filter. Take note of the underdrain construction in that the filtered water is passed through perforated pipes into the filtered water outlet. As opposed to that of the gravity filter above, the filtered water does not fall through a bottom and into the underdrain, because it had already been collected by the perforated pipes. The coarse sand and graded gravel rest on the concrete subfill.
Using a pump or any means of increasing pressure, the raw water is introduced to the unit through the raw water inlet. It passes through the bed and out into the outlet. The unit is operated under pressure, so the filter media must be enclosed in a shell. As the filter becomes clogged, it is cleaned by backwashing.Thickened and digested sludges may be further reduced in volume by dewatering. Various dewatering operations are used including vacuum filtration, centrifugation, pressure filtration, belt filters, and bed drying. In all these units, cakes areformed. We therefore call these types of filtration cake-forming filtration or simply cake filtration.
0 comments:
Post a Comment