From Dictionary of Water and Waste Management, Second Edition
fabric filter, bag f. feed water
fabric filter, bag f. An efficient dust arrestor used in many industries and in many sizes, having long, vertical, cylindrical textile or felt tubes (bags) through which the dust laden gas is blown, usually outwards ( see Figure F.1). Bag filters remove at least 99% of the dust if no bags are broken and function in the same way as a household vacuum cleaner. They can, however, cause up to 170 mm water gauge loss of gas pressure and are easily blocked, especially if the gas is cooled below its dewpoint. Bags have the following maximum working temperatures: paper 50 C; wool or felt 90 C; nylon 200 C; glass fibre 265 C if siliconised and graphited. Woven stainless steel bags are said to tolerate temperatures above 400 C. Bags have been impregnated with sodium bicarbonate so as to react with sulphur dioxide and extract it from the flue gases but this is unusual.
Figure F.1: Fabric filter.
Both working costs and energy demand are generally lower than for good scrubbers but more than for precipitators. See bag cleaning , baghouse.
faculative anaerobic bacterium, f. anaerobes
A bacterium that can grow in the presence or absence of dissolved oxygen. Consequently, it is either anaerobic or aerobic according to the conditions around it, unlike obligate anaerobes or obligate aerobes. Facultative bacteria usually function better as aerobes.
faculative waste stabilisation (stabilization) pond, f. lagoon, f. pond, aerobic anaerobic...
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