34

Bioremediation for Sustainable Environmental Cleanup

...Table 2.5 contd.

Method

Design

Advantages & Disadvantages

Downflow

Advantages:

Fluidized-Bed

- Solids recovery from reactor bottom

Reactor (DFBR)

- Large surface area for biofilm

- Good biomass retention

- Small pressure gradients

- No channeling or clogging

- Large mass transfer rates

Disadvantages:

- Biomass loss due to shear force

- Energy requirement

Gas Lift Reactor

(GLR)

Advantages:

- Good mass transfer

- Good mixing

Disadvantages:

- High pressure drop with gas substrate

Upflow Anaerobic

Sludge Blanket

(UASB)

Advantages:

- No channeling, clogging, sludge compaction

- No biomass carrier

Disadvantages:

- Biomass washout

Anaerobic Hybrid

Advantages:

Reactor (AHR)

- Less clogging

- Easy sludge removal

- Good biomass retention

Disadvantages:

- NA

Table 2.5 contd. ...