Successful Applications of ® (Patent pending) (Electro Bio-Remediation) Technology for Remediation of Volatile Organic Compound in Groundwater In-Situ Bioremediation • In-situ bioremediation is an adjustable technology, implemented in many environments. • Common treatment for aerobic remediation of MTBE and Benzene. • Current application: External gas delivery techniques (AS, SVE). • Limiting factors: Oxygen levels, nutrients availability, OPR control, site permeability conditions and oxygen loss to unsaturated zone. ® (Electro-Bio Remediation) Patent pending Is a technology that produces oxidants in-situ ® Patent pending Patent pending Computerized controller Electrolytic cells for O2 production Electrolytic cells for H2O2 production Electrolytic cells for Fe2+ production Probes: ORP, EC, pH, DO, Temp Computerized controller In-situ Preliminary site review • Data collection from the groundwater by a computerized controller during two weeks: ORP, DO, EC, pH, Temp and [Fe2+ ] •Data processing and determination of remediation program Reactor activation O2 production Computerized control: ORP, DO, EC, pH, and Temp H2O2 production Fe2+ production 2H2O → O2 + 4H+ + 4eORP > 450 mV Fe(s) →2e- + Fe2+(aq) O2 + 2H+ + 2e- → H2O2 → OH. + OH- → CO2+ H2O RCL → → Fe(s) →2e- + Fe2+(aq) R → Hydrocarbons → H2O2 production Fe2+ production O2 + 2H+ + 2e- → H2O2 → OH. + OH- → Cl- Laboratory Analysis Concentration of BTEX, MTBE, TBA, chlorinated solvents Reactor activation •O2 Production •ORP control Laboratory Analysis: concentration of metabolites and/or CSIA (compound specific isotope analysis) END 2H2O → O2 +4H + + 4e Computerized system control ORP 100 mV 450 mV • Elevating in situ Oxidants - O2 and H2O2. • Fe+2 in situ production by electrolytic cells. • Controlling ORP level. • No external gas delivery. • Low energy costs. • No depth limitation. Patent pending N 5 1 Legend EBR® reactor 6 8 Reactor MTBE (mg/L) 1 20 2 6 3 12 5 20 6 19 7 4.8 8 0.4 7 3 2 UST Dispensers flow direction North-West EBR® reactors layout and MTBE concentration BEFORE treatment ® Patent pending 5m After less than 1 year MTBE Concentrations reduced significantly! N ® Patent pending UST 4R 1R 5 13m 3 7/2011 11/2012 1 2 3 4 5 37.5 45 4.4 1.2 11 <0.005 0.01 0.035 <0.005 <0.005 Dispensers Groundwater flow Well 2R * MCL in groundwater = 0.04 mg/L Significant of MTBE Breakdown occurred after 1-2 years!! ® Patent pending Aerobic and Oxidizing conditions Biological Breakdown ® 1. EBR® system application in groundwater reduces MTBE & petroleum compounds concentrations below target levels. 2. Isotopic fractionation support bio-reduction mechanism occurrence of MTBE and other petroleum compounds. 3. End of remediation in gas station was achieved within two years. ® Patent pending Pre-treatment water quality (µg/L) Sampling MCL TCE 1079 20 PCE 9912 10 C 1,2- DCE 1840 50 VC 6 0.5 ® Patent pending Elgressy Laboratory Colona Treatment 1 Reactor & Polluted soil from site 2 Reactor & Iron pieces 3 Reactor & Electro-generated Fe2+ 4 Control Fenton reaction Fe(s) →2e- + Fe2+(aq) O2 + 2H+ + 2e- → H2O2 → OH.+ OH- RCl → CO2+ H2O ® Patent pending Final Remediation results (µg/L) for each treatment after 14h: After 14 hours of E.F activation concentration of all chlorinated solvents were reduced up to 3 magnitude of order. High efficiency of EBR® Fenton process was also recorded in a site with similar contaminated compounds. 1. EBR® provides a remediation solution for hydrocarbons in soil and groundwater. 2. The EBR® system is capable to degrade pollutants values below target levels in a relatively short time frame. 3. The EBR® solution characterized with an ability to control the reduction processes and to avoid production of hazardous by-products. 4. The system is easy to install and cost effective. E.ELGRESSY ltd www.elgressy-international.com [email protected]
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