GROUNDWATER AND LEACHATE: IN-SITU CHEMICAL/PHYSICAL TREATMENT
Bioslurping
Typical In Situ Bioslurping System
Process:
Bioslurping combines approaches of bioventing and vacuum-enhanced free-product recovery to address two separate contaminant media.
Uses:
Effectively treats contamination from petroleum hydrocarbons.
Is cost effective technology that remediates soil & removes LNAPLs in the vadose zone (un-saturated).
Applicable at sites with a deep water table (>10m).
Limitations:
Cost:
- Precise cost information is currently unavailable, however sase histories show an approx. recovery rate achieved of 1,000 gallons per month when used to remediate jet fuel, which cost $56/gal LNAPL recovered.
Bioslurping combines approaches of bioventing and vacuum-enhanced free-product recovery to address two separate contaminant media.
- Bioventing stimulates aerobic bioremediation of hydrocarbon-contaminated soils (recovers product) in the vadose zone - draws air into the soil while withdrawing soil-gas via the recovery well.
- Vacuum-enhanced free-product recovery extracts LNAPLs from the capillary fringe and the water table (remediates vadose zone, minimising changes in water table for minimum smear zone).
- The system is designed to minimize environmental discharge of ground water and soil gas.
- When free-product removal activities are completed, the bioslurping system is easily converted to a conventional bioventing system to complete the remediation.
- Medium-long term operation (few months-years).
Uses:
Effectively treats contamination from petroleum hydrocarbons.
Is cost effective technology that remediates soil & removes LNAPLs in the vadose zone (un-saturated).
Applicable at sites with a deep water table (>10m).
Limitations:
- Less effective if low-permeability/low or excessive soil moisture content/low temperatures.
- Aerobic biodegradation of chlorinated compounds may also require a co-metabolite to be present.
- The off-gas/extracted water usually require treatment before discharge.
- A feasibility test and an air permeability test are necessary
Cost:
- Precise cost information is currently unavailable, however sase histories show an approx. recovery rate achieved of 1,000 gallons per month when used to remediate jet fuel, which cost $56/gal LNAPL recovered.