Solution

Set up a table to determine the coefficients Kg and k using the following transformation of the Monod equation (3.11).

S0-S

s0-s

Biomass (X) • $

Biomass (X) <|>/(S0 - S)

1/S

mg/l

mg VSS / d /I

d

(mg/l)"1

293

409,6

1,4

0.14

288

250,0

0,9

0,08

280

208,0

0,7

0,05

270

130,0

0,5

0,033

260

132,0

0,5

0,025

Plot the term X • <|> / S0 - S versus 1/S, as shown in figure B1.1

1.4 T

1.2 --

v>

1 --

ä

0.8 --

'—.

0.6 -

X

0.4 -

0.2 --

o --

Figure B1.1 Plot of X • <|> / S0 - S versus 1 / S.

From equation B1.1 the y intercept equals (1/K).

From figure B1.1 the slope on the curve equals Ks / k. Knowing k, Ks can be found to be 24,0 mg/l.

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