05-11-2012, 02:34 PM
Treatability Studies for In-Situ Bioremediation
1Treatability Studies.pdf (Size: 1.94 MB / Downloads: 346)
Electron donor
–A compound that donates electrons during its oxidation
–Simple organic compounds such as sugars, alcohols, or methane can be oxidized to carbon dioxide (CO2)
Electron acceptor
–A compound that accepts electrons during its reduction
–Inorganic compounds like oxygen, nitrate, sulfate, oxidized metals, or CO2 can be reduced to water, nitrogen gas, hydrogen sulfide, dissolved metals, or methane, respectively
Terminology and Definitions
Biostimulation: the addition of nutritional amendments to increase microbial metabolism and to encourage biodegradation-often organic compounds e.g., lactate, emulsified vegetable oils, molasses, ethanol, etc.
Bioaugmentation: the addition of
beneficial microorganisms often
where they are not present to
improve the rate or extent of
biodegradation
Cometabolism:
- simultaneous degradation of two compounds, in which the degradation of the second compound (the secondary substrate) depends on the presence of the first compound (the primary substrate).
What is a treatability test?
•Laboratory based “bench-scale” testing
•Use site soil, sediment or rock, and groundwater
•Batch reactors constructed using site materials
•Customize treatment variables to meet site specific needs
SiREM Biotreatability Study Features
•Widely regarded as the best in the industry in terms of design, protocols, management and reporting
•Scientifically designed studies with appropriate controls and triplicate replication
•In house analytical increases data quality and reduces costs
•External analytical lab data can provide validation/expand range of compounds that can be evaluated
•Incubation conditions (aerobic/anaerobic) preserve activity of indigenous microorganisms
•Monthly email updates provide ongoing data for project managers
•Final report includes data interpretation/recommendations
Conclusions
Laboratory Biotreatability tests provide:
•Inexpensive way to evaluate remedial options
•Site specific contaminant degradation information
•Adaptable and flexible design