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Titolo:
Filtration in industrial hygiene
Autore:
Brown, RC;
Indirizzi:
Hlth & Safety Lab, Sheffield S3 7HQ, S Yorkshire, England Hlth & Safety Lab Sheffield S Yorkshire England S3 7HQ Yorkshire, England
Titolo Testata:
AIHAJ
fascicolo: 5, volume: 62, anno: 2001,
pagine: 633 - 643
SICI:
1529-8663(200109/10)62:5<633:FIIH>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MONODISPERSE AEROSOLS; DUST RESPIRATORS; PERFORMANCE; FILTERS;
Keywords:
aerosol; filter; particulate; respiratory protection; vapor;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Brown, RC Hlth & Safety Lab, Broad Lane, Sheffield S3 7HQ, S Yorkshire, England Hlth & Safety Lab Broad Lane Sheffield S Yorkshire England S3 7HQ
Citazione:
R.C. Brown, "Filtration in industrial hygiene", AIHAJ, 62(5), 2001, pp. 633-643

Abstract

Filters used in industrial hygiene are of two basic types, corresponding with the two basic airborne hazards: particulate and vapor. They are as different in their construction as they are in their purpose, and each gives negligible protection against the other hazard. By use of the correct type, adequate filtration efficiency can usually be achieved. Most particulate filters are made from fibers, and finer fibers result in higher efficiency. Filters can capture particles much smaller than the fiber diameter, as a result of diffusional motion of the airborne particles and, in the case of filters that hold a permanent electric charge, electrostatic attraction. Most vapor filters are made from granules of activated carbon, which have an extremely large effective surface area, where molecules of contaminant are adsorbed. The performance of all filters tends to alter as the filter material becomes loaded. Electrically neutral particulate filters become more efficient but at the expense of increased resistance to airflow. Particulate filters that act by electric forces may become less efficient, and are often less inclined to clog. Vapor filters usually have a high initial efficiency, but the penetration of vapor increases as the filters become saturated withadsorbed vapor, and the performance of these filters is normally expressedin terms of their lifetime rather than their efficiency. It Is important that the choice of a filter should be made with close reference to the situation in which it is to be used, and optimum respiratory protection should be sought, rather than maximum filtration efficiency. Special problems of filters are illustrated by some case histories, and finally the use of filters as size selectors for dust samplers is briefly described.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 08:54:44