Sludge data, pressure filters

This filtration rate was determined by a Buchner Funnel procedure where a preconditioned sludge sample was filtered through a prewetted Whatman No. 40 filter paper at a pressure of 15 in. Hg. Brookfield viscosities were measured on 0.5% aqueous solutions prepared from precipitated polymer using an LVF viscometer. The data displayed in Figure 4 show a tremendous decrease in filtration rate and rise in Brookfield viscosities with increasing TAMAC concentrations until the polymer becomes so highly branched that its complete solubility is questionable. 

Granular bed filters are used in ten coil coating plants to remove residual solids from the clarifier effluent, and are considered to be tertiary or advanced wastewater treatment. Chemicals may be added upstream to enhance the solids removal. Pressure filtration is also used in this industry to reduce the solids concentration in clarifier effluent and to remove excess water from the clarifier sludge. Figure 7.4 shows a granular bed filter and Table 7.13 presents the heavy metal removal data of a lime clarification and filtration system. 

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