Thus, the appropriate curve to use to obtain Js is the curve for k* = 1.0 in Figure 15.14. Entering that curve with Ssh/Ssi™,n = 1-5 gives Js/Jsk (or J*/J*k) = 0.2. Since JJK is 0.28, J? is 0.056. The value of Js can then be determined from Eq. 15.32.

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Figure 15.13 Normalized loading curves for Ri = 0.01. (From M. S. Heath, S. A. Wirtel, B. E. Rittmann, and D. R. Noguera, Closure to discussion of "Simplified design of biofilm processes using normalized loading curves." Research Journal, Water Pollution Control Federation 63:91-92, 1991. Copyright © Water Environment Federation; reprinted with permission.)

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Figure 15.14 Normalized loading curves for Ri = O.l. (From M. S. Heath, S. A. Wirtel, B. E. Rittmann, and D. R. Noguera, Closure to discussion of 'Simplified design of biolilm processes using normalized loading curves'. Research Journal, Water Pollution Control Federation 63:91-92. 1991. Copyright ii Water Environment Federation; reprinted with permission.)

Js = (U)56|(0.01 ())(().2667)(50)(l).02667)]"' = 0.00334 mg COD/(cnr ■ hr)

Once the llux is known, the required biofilm surface area can be calculated with Eq. 15.4.

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