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<br />The definition and capacity assessment development for these three subcomponents are <br />presented in the following paragraphs. <br /> <br />General <br /> <br />The general subcomponent consists of biosolids thickening and anaerobic digestion at the <br />WPCF; the biosolids pump station/force main system that conveys digested biosolids from <br />the WPCF to the BMF; and facultative sludge storage lagoons and drying beds at the remote <br />BMF. The majority of the infrastructure associated with this "General" component was <br />constructed in the 1980s and early 1990s. <br /> <br />The current loading or current required capacity is presented as annual average dry tons of <br />digested biosolids. <br /> <br />Current biosolids loading = 4,962 x 1.183 = 5,869 tons per year <br /> <br />Where: <br /> <br />4,962 dry tons per year (actual 2002 value) <br /> <br />1.183 factor to convert actual value to a value that can be directly compared to <br />the projected 2025 capacity value when a greater biosolids load will be generated <br />by changes in the treatment process, and is calculated as follows: <br /> <br />= {(60 x 1.23) + (40 x 1.11)} /100= 1.183 <br /> <br />Where: <br /> <br />60 is the weighting given to BOD for biosolids production <br />1.23 is the BOD ppcd ratio (selected/ actual) calculated as follows: <br />= 0.185/0.15 = 1.23 <br /> <br />Where: <br /> <br />0.185 is the selected annual average BOD ppcd for projected <br />influent BOD values <br /> <br />0.15 is the actual BOD ppcd (annual average over 12-year <br />period) <br />40 is the weighting given to TSS for biosolids production <br />1.11 is the TSS ppcd ratio (selected/ actual) calculated as follows: <br />= 0.233/0.21 = 1.11 <br /> <br />Where: <br /> <br />0.233 is tlle selected annual average TSS ppcd for projected <br />influent TSS values (average of dry (0.205) and wet (0.26) <br />seasonal values) <br /> <br />0.21 is the actual TSS ppcd (annual average over 12-year <br />period) <br /> <br />A-32 <br />