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Description: Treating High pH & Metals in Groundwater using Carbon Dioxide (CO2) Sparging
Treating High pH & Metals in Groundwater using Carbon Dioxide (CO2) Sparging
Abstract
Sodium hydroxide is a highly corrosive alkaline chemical often involved in industrial spills. Geosyntec Consultants addressed contamination at a site which operates as a chemical production and packaging facility. A release of approximately 40 gallons of 50% NaOH solution occurred in March 2012. The pH of the impacted groundwater ranged from 8 to 13 S.U., contributing to increased dissolved concentrations of arsenic, chromium, and lead. The treatment goal was a pH of 8.5 S.U. or less. Geosyntec selected a CO2 sparging system to treat elevated pH in groundwater.
This paper outlines an introduction to the project which consisted of treating high pH and heavy metals in groundwater using carbon dioxide (CO2) sparging. The paper describes the methodology for a bench treatability study, a field pilot study, and a full-scale implementation to study the efficacy of CO2 sparging. The document provides tables and figures to present the results of each stage of the project. Finally, the document discusses the results of the full-scale implementation and the advantages of utilizing CO2 sparging versus injections of weak acids to treat high pH and heavy metals concentrations in groundwater.
SpeakerSanchez, Stephanie
Presentation time
14:14:00
14:36:00
Session time
13:30:00
15:00:00
SessionUnique Approaches for Removal of Selenium and Other Constituents from Wastewater and Groundwater
Session number503
TopicIndustrial Issues and Treatment Technologies
TopicIndustrial Issues and Treatment Technologies
Author(s)
Stephanie Sanchez
Author(s)S. Sanchez1; K. Warner3; S. Melkote4; J. Applegate2;
Author affiliation(s)Geosyntec Consultants, Inc., Tallahassee, FL1,2,3Geosyntec Consultants, Inc., Moosic, PA4
SourceProceedings of the Water Environment Federation
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Oct 2021
DOI10.2175/193864718825158162
Volume / Issue
Content sourceWEFTEC
Copyright2021
Word count13

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