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MAR-30-'93 -UE 08:50 :L,.IELL S-OCK-ON #896 PO_ <br /> ENVU= LTD. <br /> other microbes for food. <br /> As the organisms carry out their metabolic processes, other cells are produced. <br /> The amount of cells produced can be represented by the following equation: <br /> Xv, a (COD;, - CODo„t) - b (Xv) <br /> where: <br /> Xv, = Amount of cells produced (lbs,/day) <br /> COD j, - COD„a = Amount of COD removed (lbs./day) <br /> Xv = Amount of biomass in the process Obs.) <br /> a = Fraction of substrate removed used for cell <br /> synthesis (0.2 to 0.3) <br /> b Cell auto - oxidation rate coefficient <br /> (0.02 to 0,04) <br /> The primary nutrients required by the organisms in order to remain active are <br /> nitrogen and phosphorus in a ratio of 5 parts of nitrogen for every part of <br /> .. phosphorus required. A cell typically contains about 12.5% nitrogen, but the <br /> actual amount depends on the age of the cell mass. A good rule of thumb for <br /> aerobic processes is to use a COD:N:P ratio of 100:5:1. <br /> Page 2-8 <br />