Total fixed solids

Wastewater contains a wide variety of suspended solid materials. The classification of the various solids is shown in Figure 8.3. Total solids are obtained by evaporating a sample of wastewater to dryness at 103-105°C. A filtration step separates the total suspended solids (TSS), which remain on the filter, from the total dissolved solids (TDS), which pass in the filtrate. The residue that remains after the TS are ignited at 500° C is called the total fixed solids (TFS), and they represent the inorganic salts in the sample. The solids that are volatilized... 

A useful simphfication of the total energy equation applies to a particular set of assumptions. These are a control volume with fixed solid boundaries, except for those producing shaft work, steady state conditions, and mass flow at a rate m through a single planar entrance and a single planar exit (Fig. 6-4), to whi(m the velocity vectors are perpendicular. As with Eq. (6-11), it is assumed that the stress vector tu is normal to the entrance and exit surfaces and may be approximated by the pressure p. The equivalent pressure, p + pgz, is assumed to be uniform across the entrance and exit. The average velocity at the entrance and exit surfaces is denoted by V. Subscripts 1 and 2 denote the entrance and exit, respectively. 

N R number of reaction units see Eq. (54) r equilibrium parameter s column-capacity parameter for fixed-bed operation, based on reaction-kinetics calculation t solution-capacity parameter for fixed-bed operation, based on reaction-kinetics calculation x ratio of fluid-phase concentration of a component to that of all components, c/C0 (xa, etc.) y ratio of particle-phase concentration of a component to total for solid at saturation with the feed, q/Q... 

Trichlorotrifluoroethane-soluble floatable oil and grease Total solids dried at 103-105°C, total dissolved solids dried at 180°C, total suspended solids dried at 103-105°C, fixed and voiatiie solids ignited at 550°C, settleable solids (volumetric or gravimetric test) total, fixed, and volatile in solid and semisolid samples... 

D) Fixed Solids and Volatile Solids Fixed Solids is the term applied to the residue of total, sus )endcd or dissolved solids after ignition for a spet ified time at a S[>ecified temperature. Tlie weight loss on ignition is called Volatile Solids . If the ignition is conducted at a temperature at which... 

Therefore, Fixed Solids (of total, suspended or dissolved matter, as the case may be)... 

An elementary solid, such as silver, is regarded as composed of atoms oscillating about fixed centres. The total energy content is therefore partly kinetic and partly potential. Since the solid has a finite compressibility, the atoms may be supposed to be maintained at small distances apart by forces they exert upon one another, and these may be resolved into two sets, one of which opposes a closer approximation of the atoms, and the other tends to draw the latter together. Both are functions of the distance between the atoms, and for a given distance are equal, since the form of the body is altered by external forces alone. 

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