| (iii) minimum detention time per the following equation:
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(F) Determine clarifier volume. The volume of a clarifier
is the surface area multiplied by the SWD determined in subparagraph
(E) of this paragraph.
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(G) The formulas for Equation F.17. in Figure: 30 TAC §217.164(e)(2)(G)(i);
Equation F.18. in Figure: 30 TAC §217.164(e)(2)(G)(ii); and Table
F.10. in Figure 2: 30 TAC §217.164(e)(2)(I); calculate the rates
that are equal to the settling velocity of activated sludge at various
floc volume concentrations. For values less than 30%, the floc volume
is the 30-minute settled volume in an unstirred one-liter graduated
cylinder. For values greater than 30%, the sample is diluted so that
the settled volume is at least 15% but not more than 30%, and the
result multiplied by the dilution factor.
(i) For floc volume less than 40%, use the following
equation; or
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(ii) For floc volume greater than 40%, use the following
equation:
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(H) Table F.9. in Figure 1: 30 TAC §217.164(e)(2)(I)
and Table F.11. in Figure 3: 30 TAC §217.164(e)(2)(I) are based
on an analysis of the floc volume-flux, i.e. floc volume times settling
velocity, calculated from Equation F.17. in Figure: 30 TAC §217.164(e)(2)(G)(i)
and Equation F.18. in Figure: 30 TAC §217.164(e)(2)(G)(ii). Table
F.11. in Figure 3: 30 TAC §217.164(e)(2)(I) is a tabulation of
the maximum concentration of the underflow at different underflow
rates. Equation F.19. is for Table F.11. in Figure 3: 30 TAC §217.164(e)(2)(I).
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(I) Table F.9. in Figure 1: 30 TAC §217.164(e)(2)(I)
determines the weir overflow rate that, along with the underflow rate
and MLSS, determines the same floc volume-flux as shown in Table F.11.
in Figure 3: 30 TAC §217.164(e)(2)(I).
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