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Case Study biological groundwater remediation
 
A fire brigade operation on a tyre production site resulted in contamination of groundwater with anionic surfactants, BTEX and Trimethylbenzene (TMB) from fire retardant. A biological/physical “Pump & Treat” process was selected for remediation.
 
Groundwater capture was achieved via 2 pre-existing groundwater wells. The wells were equipped with a frequency regulated underwater motorised pump, complete with dry-running protection. The 2-stage groundwater treatment plant consisted of a biological stage as well as a downstream adsorption stage. Connection to the groundwater wells was attained below floor level. Works were put into practice by ARGUS. Discharge of remediated groundwater took place in a rainwater discharge system.
Treatment Plant Specifications:
Contaminant Concentrations:
88.0% of Surfactants and 92.7% BTEX/TMB were removed from groundwater in the biological stage. Pre-determined discharge limits set by the regulatory authorities were always met based on the total degree of remediation that was attained (99.9%).
 
The remediation was able to be concluded after just 8 months. A total of 48670 m³ of groundwater was cleaned. Replacement of activated-carbon was not necessary due to the high degree of biodegradation.
Groundwater treatment plant
13
175
BTEX/TMB
252
2.100
Surfactants
Contaminant
Inflow
(Downstream)
 
in µg/l
Outflow
bioreactor

 
in µg/l
Total Outflow
 
 
in µg/l
< BG
< BG
permissible
limit

 
in µg/l
200
10
Flow rate
8,5 m³/h
Biological Stage
2 x 2 m³ Bio-Fixed Bed Reactor
Adsorptions Stage
2 x 2 m³ Water Activated-Carbon
Remote Monitoring
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