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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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1590 Hanadi S. Rifai, Charles J. Newell, Todd H. Wiedemeier<br />

Compound<br />

TCE<br />

Vinyl<br />

chloride<br />

Type <strong>of</strong> study<br />

Microcosm<br />

Microcosm<br />

Redox<br />

environment<br />

Aerobic-<br />

Cometabolism<br />

(toluene)<br />

Aerobic-<br />

Cometabolism<br />

(phenol)<br />

Aerobic-<br />

Growth reac-<br />

Cometabolism<br />

tor<br />

(propane)<br />

Batch Aerobic<br />

Batch<br />

Continuous<br />

reactor<br />

Continuous<br />

reactor<br />

Aerobic<br />

Aerobic-<br />

Cometabolism<br />

(methane)<br />

Culture<br />

Propaneoxidizing<br />

culture<br />

Methylomonas<br />

methanica 68-1<br />

Methylosinus<br />

trichosporium<br />

OB3b<br />

Methylosinus<br />

trichosporium<br />

OB3b<br />

Mixed<br />

methanotrophic<br />

culture<br />

μ max , day -1<br />

0.77-<br />

1.65<br />

0.88-<br />

1.43<br />

Half-saturation,<br />

Ks, mg/L<br />

Yield, Y, mg/mg<br />

Max. spec. degradation<br />

rate,<br />

μ max /Y,<br />

mg/mg-day<br />

Initial concentration,<br />

So,<br />

mg/L<br />

Ref<br />

0.52 1.50 0.66 98<br />

0.40 3.00 0.66 98<br />

0.60 0.04 3.00 99<br />

29.48 0.10 438.59 100<br />

16.51 0.08 187.70 100<br />

19.00 54.71 9.17-13.10 92<br />

0.01 101<br />

Methanogenic<br />

fluidized<br />

reactor<br />

bed Anaerobic 23.00 52<br />

Small-<br />

Column<br />

Microcosm<br />

Aerobic-<br />

Cometabolism<br />

(methane)<br />

1.00-<br />

3.50<br />

1.00-17.00 102<br />

[From M.P. Suarez and H.S. Rifai, Bioremediation Journal, 3, 337-362. Copyright © 1999 Battelle Memorial Institute.<br />

Reprinted with permission.]<br />

23.1.4.2 Zero-order rates<br />

A summary <strong>of</strong> more than 40 studies reporting zero-order rates is included in Table 23.1.6.<br />

The reported zero-order rates ranged from 0 to 19.8 mg/L/day with mean values for anaerobic<br />

rates <strong>of</strong> 0.04, 2.14, 1.80, 1.74, and 0.11 mg/L/day for carbon tetrachloride, DCE, PCE,<br />

TCE, and vinyl chloride, respectively. TCE appeared to be reductively dechlorinated at the<br />

fastest rate coefficient, with a median equal to 0.76 mg/L/day. In contrast, vinyl chloride exhibited<br />

the slowest rate coefficient <strong>of</strong> reductive dechlorination with a median value <strong>of</strong> 0.01<br />

mg/L/day.

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