Bioremediation of BTEX Compounds.ppt

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1、Bioremediation of BTEX Compounds,CE 679 Adv. Water and Wastewater TreatmentBy: Zach Maruska,December 10, 2007,Outline,IntroductionProject ObjectivesAlternativesPreliminary DesignConclusions,Introduction,What is BTEX?BenzeneTolueneEthylbenzeneXylene,Why is BTEX a Concern?,VolatileRelatively water sol

2、uble,Technical Outreach Services for Communities,Objectives,BTEX remediation alternatives In situ vs. ex situDesign the selected alternative Oxygen or other nutrients needed for degradation,Treatment Alternatives,Ex Situ Pump and treat More control CostlyIn Situ Injection points Additional nutrients

3、,Aeration conditions,Aerobic Higher costs Shorter treatment timeAnaerobic Low initial cost Typically lower O&M costs Longer treatment time,Design Alternative,In situ remediation of BTEX Less costlyAerobic Shorter treatment time Oxygen Release Compound (ORC)*Regenesis,Oxygen Release Compound,When hyd

4、rated, ORC releases O2 Releases O2 for up to one year Controlled Release Technology avoids foaming,ORC produced by Regenesis,ORC Advantages,Aerobic conditions without O&M costsControlled release of oxygenLong-term source of oxygenClean, non-disruptive applicationNo harmful by-products,ORC Considerat

5、ions,ORC vs. ORC Advanced Both Provide Oxygen ORC Releases 10% of its weight as O2 ORC Adv. Releases 17% of its weight as O2 ORC Adv. is an oxidizing compound More Hazards Associated with ORC Adv.,Design Parameters,Site Parameters30 x 60 x 10Porosity of Soil = 0.35Concentrations of BTEX compounds5 m

6、g/L, 2 mg/L, 5 mg/L, & 8 mg/L (respectively) Total Concentration = 20 mg/LSource has been stopped,BTEX Degradation,Stoichiometry Benzene C6H6 + 7.5O2 6CO2 + 3H2O Toluene C7H8 + 9O2 7CO2 + 4H2O Ethylbenzene C8H10 + 10.5O2 8CO2 + 5H2O Xylene C8H10 + 10.5O2 8CO2 + 5H2OO2 requirementsApproximately 3.13

7、g O2/g BTEX,Design,Concentration of BTEX = 20 mg/L62.5 mg O2/LORC releases 10% of its weight as O2625 mg ORC/L1,250 mg ORC/L (with F.S. = 2),Site Layout,Design,5-ft Radius For Injection Points37 Injection Points7800 L of Water per Injection Point9.6 kg of ORC per Injection Point800 lbs of ORC Requir

8、ed$8,000 for ORC,Conclusions,In Situ is more cost effectiveAerobic will allow faster remediationOxygen Release Compound (ORC) eliminates the need for above ground pipingORC is a cost effective alternative for aerobic biodegradation of BTEX,References,Attra, Kevin. Environmental Analysis of BTEX Comp

9、ounds in Soil, Water and Sludge by GC/PID. Phelps, Craig D., L. Y. Young, (1998). Anaerobic biodegradation of BTEX and gasoline in various aquatic sediments. Biodegradation, 10, 15-25. Regenesis, Advanced Technologies for Groundwater Resources, (2006). . Tiehm, A., S. Schulze, (2003). Intrinsic Aromatic Hydrocarbon Biodegradation for Groundwater Remediation. Oil & Gas Science and Technology, Vol. 58, No. 4, pp. 449-462. TOSC Environmental Briefs for Citizens. BTEX Contamination.,Questions?,Thank you!,