Roadblocks to the implementation of biotreatment strategies - Bioremediation of Recalcitrant Compounds - page 35

Table 3.1 Influences of Bioremediation Techniques on Bioactivity Control
In Situ Ex Situ Solid Ex Situ Slurry

Pump
and
Treat

Bioventing
and Air
Sparging

Soil
Treatment
Units

Compost
Piles

Bioactivity Parameter Percolation Biopiles Lagoon Bioreactor

Air or oxygen ++ a 0 + ++ ++ +++ ++ +++

Alternative terminal electron
acceptor

++ ++ + b 0 b 0 b 0 b 00 b ++

pH 0 00 00 ++ + + ++ +++

Nutrients and growth factors 0 0 0 + + + ++ ++

Inoculation bioaugmentation + 00 00 + + + ++ ++

Heterogeneity 0 00 00 + + + ++ ++

Agitation or mixing 0 00 00 + + + ++ +++

Temperature 0 00 00 0 + + 0 ++

Microbial community
structure control

00 00 00 0 0 0 0 +

Water activity 00 00 00 + + + 00 00

Salinity 0 0 0 + + + + +

Control of inhibitors + 0 0 + + + + +

Containment of effluents 0 00 00 + + + + ++

Addition of treatment
chemicals

0 00 00 + + + + +

Note : Although this table is an old source, it still provides an accurate summary.
a Key: +, ease; 0, difficulty.
b Ability to employ alternative terminal electron acceptor influenced by ability to limit the presence of air or oxygen.
Source: From Blackburn, J.W. and Hafter, W.R., TIBTECH , 11 (August), 329, 1993.