Chemistry dating site review Live straight sex chat room

Filtration, the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles.Either the clarified fluid or the solid particles removed from the fluid may be the desired product.vacuum filters usually are used in industry in preference to gravity filters.The driving force that can be supplied by pressure or vacuum is much greater than gravity, thus permitting higher filtration rates.Filter media may be divided into two general classes: (1) thin barriers, exemplified by a filter cloth, filter screen, or common laboratory filter paper; (2) thick or en masse barriers, such as sand beds, coke beds, porous ceramics, porous metal, and the precoat of filter aid which is often used in the industrial filtration of fluids that contain gelatinous precipitates.A thin filter medium offers a single barrier in which the openings are smaller than the particles to be removed from the fluid.Tertiary treatment of wastewater(Left) During the filtering step, wastewater from secondary treatment, still containing suspended solids, pours from a trough and percolates through a filter bed made of porous media such as sand, gravel, and anthracite.The filtered water is then piped away for disposal.

If the filter cake is gelatinous or the particles are soft and compressible, rather than firm, the filter cake may “blind”; that is, the pores in the cake may close and stop filtration.After solids accumulate the beds may be backwashed with clear fluid to clean the bed.The fluid to be filtered will pass through the filter medium only if some driving force is applied.The particles may travel for some distance along the tortuous path of the fluid through the medium but sooner or later will be entrapped in the finer interstices between the particles that constitute the filter bed.In this way the soft particles removed are distributed over a volume of filter medium that is sufficient to prevent blinding and stoppage of filtration.If this happens, a filter aid or a thick filter medium such as the sand bed may be used.


Leave a Reply