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Sustainable Treatment of Perchlorate Contaminated Soil and - - PowerPoint PPT Presentation
Sustainable Treatment of Perchlorate Contaminated Soil and - - PowerPoint PPT Presentation
Sustainable Treatment of Perchlorate Contaminated Soil and Groundwater Using Local Resources Presented at the Fourth International Conference on Sustainable Remediation Montreal, Quebec 26 April 2016 Presented by: Kevin Morris 5 June 2013
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Site Overview
Site located in Indiana within a mile of a large river system. Site has operated as a signal flare manufacturing facility since the late 1940’s. Manufacturing process includes handling and mixing
- f ammonium perchlorate.
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Problem
■ Perchlorate releases over a 30 to 40 year period from a mixing building had impacted shallow soils and groundwater. ■ Perchlorate concentrations in soil beneath process building at 28,000 µg/kg. ■ Perchlorate in groundwater at 19,000 µg/L with a plume approaching the property boundary. ■ State agency requiring treatment of source area as well as mitigating migration of impacted groundwater. ■ Area is rural farmland, therefore remediation has to consider potential impacts to local community
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Remediation Assessment
■ Remediation assessment included reviewing technologies based on effectiveness, implementability, cost and sustainability criteria. ■ Technologies considered included excavation, pump and treat and in situ bioremediation. ■ Stakeholders engaged during assessment included liability owner, regulatory agency and adjacent property owners. ■ In situ bioremediation determined to be the most effective, implementable and sustainable remedy agreed upon by all stakeholders assuming risk-based remedial goals and use of locally sourced materials.
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Solution
■ Develop risk-based remedial goals that are protective of human health and the environment ■ Install injection biobarrier immediately downgradient of mixing building ■ Decontaminate and remove building and slab ■ Source area bioremediation beneath building via in situ bioreactor ■ Monitoring of soil and groundwater
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Remedy Selection Via the 3 Pillars
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■ Consider potential impacts to all stakeholders (including local community) ■ Consider economic impact to client ■ Consider environmental impact of the remedy while achieving risk-based remedial goals
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Bioreactors as Green & Sustainable Remediation
■ Relatively low energy usage for installations ■ Carbon/electron donor sourc was obtained locally on site ■ No O&M ■ Low carbon footprint compared to other more energy intensive remediation strategies such as excavation and pump and treat
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Primary Components of Mulch
Cellulose Lignin Hemicellulose
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Perchlorate Reduction
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Mixing Building
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Building Demolition
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Demolition Continued
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Remediation
■ Installed injection biobarrier in September 2010 (15 injection points downgradient of mixing building) ■ Building decontaminated and demolished early October 2010 ■ Soils beneath former mixing building mixed with composted landscaping waste generated onsite down to a depth of 5 feet bgs ■ Drip feed system saturates vadose soils with 10,000 gallons of water
- ver 24 hours
■ Area covered to prevent infiltration of oxygenated precipitation and maintain anoxic conditions.
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In Situ Bioreactor
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Treatment Completed
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Perchlorate (µg/kg ) in Soil 1 - 2 feet bgs
5,000 10,000 15,000 20,000 25,000 30,000
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Perchlorate (µg/kg ) in Soil 5 – 6 feet bgs
5,000 10,000 15,000 20,000 25,000 30,000 1-Sep-09 1-Oct-09 1-Nov-09 1-Dec-09 1-Jan-10 1-Feb-10 1-Mar-10 1-Apr-10 1-May-10 1-Jun-10 1-Jul-10 1-Aug-10 1-Sep-10 1-Oct-10 1-Nov-10 1-Dec-10 1-Jan-11 1-Feb-11 1-Mar-11 1-Apr-11 1-May-11 1-Jun-11 1-Jul-11 1-Aug-11 1-Sep-11 1-Oct-11 1-Nov-11 1-Dec-11 1-Jan-12 1-Feb-12 1-Mar-12
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Observations
■ Perchlorate in groundwater has been reduced by 90% ■ Perchlorate in soils were reduced by >90% within 2 years of remediation with no rebound ■ IDEM has agreed to no further action with covenant not to sue based
- n positive results
■ Redox conditions in groundwater continues to be reducing and are expected to allow for ongoing degradation of perchlorate
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Conclusions
■ Remediation successful at achieving risk based concentrations in soils ■ Remediation effort also successfully mitigated migration of perchlorate from the site ■ Remediation effort consumed little energy (3 days of heavy equipment for demolition and soil mixing) ■ Remediation effort had no negative impact on local community
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