Vít Matějů, Robin Kyclt, Alena Polenková* ENVISAN-GEM, a.s.

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Presentation transcript:

ENHANCED ATTENUATION OF CHLORINATED SOLVENTS WITH ETHANOL AND NONIONIC SURFACTANT Vít Matějů, Robin Kyclt, Alena Polenková* ENVISAN-GEM, a.s. envisan@vol.cz *GEOTEST Brno, a.s., apolenkova@geotest.cz Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

ENHANCED ATTENUATION Used in many applications Various heterotrophic substrates employed for elimination of dissolved oxygen and creating anaerobic conditions, e.g. molasses lactate emulsified vegetable oil ethanol, methanol, acetate Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

ETHANOL - ADVANTAGES Ethanol is degraded to inocuous products: CO2, H2O Molasses – melanoids, melanins – COD, BOD load of groundwater, brownish color, nearly non biodegradable Whey – proteins, mineral compounds, Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

ETHANOL- ADVANTAGES Ethanol acts as a cosolvent Enhances desorption of sorbed pollutant molecules Makes pollutants more bioavailable Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I Machine work founded in 1920 Present pollutants: - chlorinated ethylenes PCE and TCE - heavy metals Cd, Ni, Cu - oil hydrocarbons Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I Monitoring results: - dechlorination of PCE and TCE is proceeding - dechlorination products where found Monitoring parameters - redox potential - concentration of dissolved oxygen - pH and temperature Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I - count of aerobic and anaerobic heterotrophic bacteria - concentration of ammonium and nitrate nitrogen, orthophosphate phosphorus Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I Ethanol addition Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I After ethanol injection the following changes occurred: dissolved oxygen concentration was nearly 0 mg.L-1 in all wells redox potencial decreased to – 256 mV in the mean bacterial count increased by two orders of magnitude from 104 CFU.mL-1 to 106 CFU.mL-1 Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I - REBOUNDING Ethanol addition Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I Surfactant washing injection of SUPERNEU® - concentration 7 %, concentration in groundwater 0.05 % critical miceliar concentration 0.003 % 12 pore volumes Concentration of PCE and TCE substantially decreased, c-1,2-DCE is 2500 µg.L-1 Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY I Changing conditions to aerobic will increase the dechlorination rate of c-1,2-DCE and VC Addition of hydrogen peroxide Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY II Automotive industry, pollution 50 to 60 years old Pollutants PCE, TCE Remediation started 11 years ago by pump&treat Low well yields - pump&treat not efficient Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY II Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY II 2001-2002 – monitoring once or twice a year 2004 – Sept. + November – 2 runs of monitoring 2007 – pollutant concentration 2008 – pollutant concentration 2009 – enhancement of natural processes Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY II Ethanol addition Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY II Ethanol addition Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CASE STUDY II Ethanol addition Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CONCLUSIONS Ethanol works well as heterotrophic substrate for control of physicochemical parameters of groundwater Ethanol injection could be used as a tool for control of biological reductive dechlorination When injected in low concentration no adverse effect upon bacterial consorcia Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

CONCLUSION Sequential treatment improves removal of c-1,2-DCE and VC Anaerobic-aerobic conditions enables to eliminate or chlorinated ethylenes Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

ANY QUESTIONS Contaminated Sites II-Bratislava- 15.6. až 17.6.2009

THANK YOU ATTENTION FOR YOUR Contaminated Sites II-Bratislava- 15.6. až 17.6.2009