noun
definition
The act or process of filtering; the mechanical separation of a liquid from the undissolved particles floating in it.
definition
A totally ordered collection of subsets.
Examples of filtration in a Sentence
The municipality owns its waterworks and filtration plant.
There are pumping works and filtration beds for the water-supply of London.
Sand filtration, even when working in the best possible manner, falls short of the perfection necessary to prevent the passage of bacteria which may multiply after the filter is passed.
The city added to its waterworks a filtration plant, with a total capacity of 150,000 gal.
After filtration the water is pumped to the storage tanks.
In some cases the operation of filtration is performed for the sake of removing impurities from the filtrate or liquid filtered, as in the purification of water for drinking purposes; in others the aim is to recover and collect the solid matter, as when the chemist filters off a precipitate from the liquid in which it is suspended.
In many processes of chemical technology filtration plays an important part.
The city owns a fine water-supply and a filtration plant covering 20 acres, with a capacity of 30,000,000 gallons daily and storage reservoirs with a capacity of 2 2 7,000,000 gallons.
In connexion with the water works there is a good filtration plant.
The water supply is derived from the Maumee river and is filtered by a municipal filtration plant.
Judging from the best observations that have been made on a large scale, the highest rate of efficient filtration when the surface film is in good condition is about 4 in.
Moreover, if a natural water is so liable to pathogenic pollution as to demand filtration of this kind, it ought at once to be discarded for an initially pure supply; not necessarily pure in an apparent or even in a chemical sense, for water may be visibly coloured, or may contain considerable proportions both of organic and inorganic impurity, and yet be tasteless and free from pathogenic pollution.
Dead, microscopic algae will clump together into particles large enough to be removed by filtration.
See also biological filtration and ion exchange for methods to remove ammonia from the water.
In contrast, a large bullfrog 's tank will need daily water changes or a filtration system.
Some of the more viscous crude oils obtained in the United States are employed as lubricants under the name of " natural oils," either without any treatment or after clarification by subsidence and filtration through animal charcoal.
In the separation of the constituents of the complex mixture of oxides obtained from the " rare earth " minerals, the methods generally forced upon chemists are those of fractional precipitation or crystallization; the striking resemblances of the compounds of these elements rarely admitting of a complete separation by simple precipitation and filtration.
The sulphates are treated with water, which dissolves the uranium and other soluble salts, while silica, lead sulphate, &c., remain; these are removed by filtration.
The latter operation furnishes an intimate mixture of the carbonate with charcoal, from which the carbonate is extracted by lixiviation with water and filtration.
This is heated to boiling, and the residue after filtration contains about 30% of Prussian blue.
The calcium carbonate, being insoluble, is easily separated from the caustic liquor by filtration.
The space below the sieve thus formed is connected by means of an outlet tap with a closed tank, and this again communicates with a vacuum pump. By this means the filtration is quickened by the atmospheric pressure, and goes on very rapidly, as also does the subsequent washing.
The city owns and operates its watersupply system (with an excellent filtration plant installed in 1904) and its gas and electric lighting plants.
If calcium chloride be used the precipitated calcium sulphate must be removed by filtration.
By growing this bacillus in broth a toxin is formed which remains in solution and can be separated from the bacilli themselves by filtration.
The insoluble matter is treated with a hot solution of alkaline ammonium acetate, which dissolves the lead sulphate, the other materials being separated by filtration.
As the process continued the salt-saturated layer, incapable of further effective filtration, grew in thickness downwards, until in the process of time it filled the whole mass of sandstone.
But before this was accomplished the filtration of the effluent became defective, and brackish water was received, which rapidly increased nearly to the saltness of the inflow.
Where, therefore, there is animal pollution of any kind, more especially where there is human pollution, generally indicated by the presence of bacillus coli communis, purification is of supreme importance, and no process has yet been devised which, except at extravagant cost, supersedes for public supplies that of properly-conducted sand filtration.
Yet it cannot be too constantly urged that such filtration depends for its comparative perfection upon the surface film; that this surface film is not present when the filter is new, or when its materials have been recently washed; that it may be, and very often is, punctured by the actual working of the filters, or for the purpose of increasing their discharge; and that at the best it must be regarded as an exceedingly thin line of defence, not to be depended upon as a safeguard against highly polluted waters, if a purer source of supply can possibly be found.
No public supply should be open to any such doubt as ought to, or may, deter people from drinking the water without previous domestic filtration or boiling.
This complex included a larger aviary with two ponds of differing depths, the water circulating through the aviary via an external filtration bed.
Mulch improves water filtration into the soil and prevents the compaction and erosion that heavy rainfall can cause.
The factory discharges its effluent to sewer following partial treatment using dissolved air floatation (DAF) technology and high rate filtration.
Examples of such technologies include heat shields, water filtration systems, and the famous zero-gravity space pen.
Established in 1997 the customer base spans offshore, sub-sea, automotive, filtration and now medical.
We do this by using a technique called reverse osmosis which is a filtration process.
Reverse osmosis a high pressure filtration system that uses selectively permeable membranes with extremely small pores to separate ions and particles.
Without good pond filtration your pond filtration your pond will sooner or later become a death trap for your fish.
At the heart of the koi pond At the heart of a koi pond is the filtration system.
It also allows the rapid resumption of filtration once the settlement chambers have been purged.
It is probably also cleared by glomerular filtration, and can be used for renal scintigraphy.
Many did not know that certain filtration media can cause the lung disease silicosis.
Some bitters are prepared by simple maceration and subsequent filtration (see Liqueurs), others by the more complicated distillation process.
There are several materials now in use possessing remarkable power to decolourize clarify, chemically purify and oxidize water; but they are too costly for use in connexion with public water supplies unless a rate of filtration is adopted quite inconsistent with the formation of a surface film capable of arresting micro-organisms. This fact does not render them less useful when applied to the arts in which they are successfully employed.
This stands in marked contrast to oil and fuel filters where there is a relatively large amount of information regarding filtration requirements and capabilities.
When the tryptophan levels in the vat are high enough, the solution is purified by filtration.
Bosch high filtration vacuum cleaner made for ease of use, high filtration, and durability.
The engineers' newest project is to devise a more efficient water filtration system.
More advanced coffee makers will have water filtration systems to remove the chlorine and lime from tap water.