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  1. monitored natural attenuation
    • isolation/containment
    • contaminant mobility
    • biodegradation/transformation under intrinsic conditions
    • presence of required microbial community
    • presence of required nutrients

    • advantages:
    • ease
    • low cost

    • disadvantages:
    • slow
    • public perception
    • long term monitoring required
  2. engineered remediation ex-situ
    • accessibility
    • rate of biodegradation
    • is a microbial consortium required
    • are the microbial end products stable and non-toxic
    • will microbial end products cause adverse geochemical effects
    • excessive biomass production

    • advantages:
    • controlled environment
    • ease of monitoring

    • disadvantages:
    • not applicable to large plumes
    • not applicable to low level concentrations
    • cost
    • complexity
  3. crucial parameters of operational effectiveness of organic waste treatment, electron donor
    • bacterial metabolism
    • bacterial electron transfer
    • performance of the cation selective membrane
    • intrinsic electrical resistance of the system
    • efficiency of the cathode oxidation step
  4. engineered remediation in-situ
    • extent of contaminant plume
    • are environmental parameters conducive
    • accessibility of contaminant
    • are the appropriate populations present

    • advantages:
    • applicable to large plumes
    • applicable to low level concentration

    • disadvantages:
    • uncontrolled environment
    • cost
    • complexity
    • difficulty of monitoring
    • biofouling
  5. typical effects of electron donor amendments into the subsurface
    • stimulation of non-target microbial communities in the near-well environment using precious electron donor
    • loss of hydraulic conductivity through biofouling decreasing zone of impact
    • increased activity of fermenters, iron reducers, sulfate reducers and methanogens causing additional reduction in water quality
    • solubilization and mobilization or normally immobile toxic metals
  6. the biogeochemical characterisitics of an ideal electron donor
    • highly soluble
    • non-fermentable
    • biocidal at elevated concentrations
    • limit its stimulatory effects to the target contaminant
    • should not impact the geochemistry of the environment
Card Set:
2011-11-09 08:47:07
PMB 112 midterm2

general microbiology midterm 2
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