By W. W. Eckenfelder and D. J. O'Connor (Auth.)
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Extra resources for Biological Waste Treatment
Per hour. In some cases the utilization rate may be expressed in other forms. Some of the more common are listed below. m. Ο2/Ι1Γ kr ==•= mg 0 2 /hr/g sludge QQ^ R= ml/02 hr/g sludge (I ml of 0 2 contains 1-43 mg 0 2 ) A linear relationship will exist between sludge concentration and oxygen utilization over the range of sludge concentrations usually employed. ) the unit rate of oxygen utilization may decrease due to diffusional resistances (Dawson and Jenkins, 1949). In most cases the specific uptake rate (kT) will vary inversely with organism size.
M. Sludge recycle ratio : From a material balance of the process (neglecting solids in the influent waste) the sludge recycle ratio (r ~ R/Q) becomes: 5. 3000 PRINCIPLES OF BIOLOGICAL OXIDATION 33 BOD at beginning of the aeration period: Q la + R le , /o = = - q T r ^ J ^ 4 t . m. F F If effects of short-circuiting are neglected : per cent BOD removal (based on / 0 ) = ^ = 75 per cent 200 and from Fig. 2-6 5 a . , t = 2-6 hr Volume of aeration tank V=4 Mgal/day Χ ~ BIO-OXIDATION = 0-433 mg OF PURE COMPOUNDS Studies on the oxidation of various pure organic substances have been conducted by several investigators.
2-14. It can be seen from Fig. 2-1 that the sludge accumulation for an oxidation process will be the net growth (a-c) less that portion which is oxidized by the sludge mass (c-d). The net growth will depend on the starting point on the time axis which in turn depends on the BOD loading level to the process. From these considerations the resultant PRINCIPLES OF BIOLOGICAL OXIDATION 55 net accumulation of sludge from synthesis and oxidation can be expressed: AS(lb/day VSS) = j£ r (lb/day B O D 5 removed) - ôS a(lb/MLVSS) (2-18a) The constant a represents the fraction of 5-day BOD removed which is synthesized to new biological sludge.