Filter capacity

More detailea descriptions of small-scale sedimentation and filtration tests are presented in other parts of this section. Interpretation of the results and their conversion into preliminary estimates of such quantities as thickener size, centrifuge capacity, filter area, sludge density, cake diyness, and wash requirements also are discussed. Both the tests and the data treatment must be in experienced hands if error is to be avoided. 

FIGURE 4. Electrochemical reactor composed of a 2 cm3 capacity filter funnel and (A) stainless steel wire, (B, G) stainless steel needles for N2 entry and exit ports, (C) rubber septum, (D) lead foil cathode, (F) fine porosity glass filter, (H) plug of silicone glue and (I) silver wire anode. (Taken from Reference 176.)... 

Earlier theories of attention such as that proposed by Broadbent (1958) suggested that some physical property of sensory stimuli dictates whether or not they are available to further processing (Fig. 1). Crucially Broadbent considered attention to be a real physical property of the nervous system, not a convenient psychological construct or metaphor. In this formulation early selection of stimuli is performed by a limited capacity filter and only selected stimuli are encoded. While this and similar models paved the way for experimental re-... 

Figure 1. An example of an early selection model of attention based on Broadbent (1958). Following registration of stimuli, a limited capacity filter determines which stimuli are available for further, higher level analysis. The properties which determine the nature of filtering may be modified by descending influences.

Observations which could not be accommodated within a simple, limited capacity filter model led to the development of late-selection theories of atten-... 

Filter devices to protect against hazardous and/or lethal gases and vapors are divided a) into types according to the kind of gas to be filtered and b) into classes according to their capacity. Filters of class 3 with a large capacity are stored externally, usually in a container to be carried at one s side, since they are too heavy to be carried on the mask. They are connected to the mask with a hose. Filters of class 2 are screwed into the mask and form the majority of all used filter types. Filters of class 1 are plug-in filters. 

Experiment 14. — Supplies Retort, ring and stand, pneumatic trough, six bottles (about 250 cc. capacity), filter paper, splinter of soft wood, deflagrating spoon, roll sulphur, piece of charcoal fastened to a wire, short piece of wire picture cord unwound at one end, magnesium ribbon, 15 gm. of crystallized potassium chlorate, and 15 gm. of coarsely powdered manganese dioxide. 

Nose-and-mouth masks with low-capacity filters should be used only for light work requiring great freedom of movement, where the concentration of contaminants does not exceed lOOOppm. 

Figures 18.2 and 18.3 show the typical interdependencies ofthe parameters specific filtration capacity, filter-cake residual moisture and cycle time.

Miscellaneous glassware - pipettes, separator funnels, Idm capacity, filter... 

Sulfur handling has also been upgraded. In the Mobil unit, which has a sulfur capacity of 1.5 LT/D. a slipstream of the external circulation stream is taken to a dual bag filter system where the sulfur is recovered and stored in 1,000 kg capacity filter bags (Hardison, 1992 Nicmiec. 199. >). LO-CAT 11 units equipped with melters have intermediate filtering devices to improve the quality of the sulfur product. 

---