Physiochemical Treatment Options for High-Conductivity Coal Mining Runoff

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dc.contributor.authorGrey, Catherine Vyvianen
dc.contributor.committeechairBoardman, Gregory D.en
dc.contributor.committeechairVikesland, Peter J.en
dc.contributor.committeememberParks, Jeffrey L.en
dc.contributor.departmentCivil and Environmental Engineeringen
dc.date.accessioned2018-09-14T06:00:35Zen
dc.date.available2018-09-14T06:00:35Zen
dc.date.issued2017-03-22en
dc.description.abstractIn recent years, the excessive specific conductance (SC) of Appalachian coal mining runoff waters has become a parameter of concern with the EPA due to its negative effect on aquatic life and water quality. In order to comply with the EPA guidance suggesting an effluent SC of 500 µS/cm, the Appalachian Research Initiative for Environmental Science (ARIES) Center at Virginia Tech requested that testing be done to determine the most effective technologies for reduction of SC. Runoff water was collected from two sites in southwestern Virginia and characterized to determine the source of SC in the water. The main contributing ions were determined to be Na⁺, Mg²⁻, Ca²⁺, and SO₄²⁻. Testing was performed to assess the possibility of using the speciation software, MINEQL+, with a set of empirical equations which predict SC using ionic composition for natural waters with a low to medium SC. The physicochemical treatment methods tested were ion exchange, excess lime-soda softening, and the Cost Effective Sulfate Removal (CESR) process. Both cation (H⁺ exchanger) and anion (Cl⁻ exchanger) exchange media were tested separately in batch reactors, which resulted in a higher effluent SC than initial SC. The softening method investigated, excess lime-soda softening, also resulted in increased SC levels because non-carbonate hardness levels were high and carbonate concentrations were low. The CESR process successfully lowered SC from 1,500-2,500 µS/cm to below the proposed EPA limit of 500 µS/cm. The success of this process was due to its ability to remove more than 85% of the calcium, magnesium, and sulfate from the water, which together accounted for more than 90% of ions in the source water.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:10045en
dc.identifier.urihttp://hdl.handle.net/10919/85011en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectIon Exchangeen
dc.subjectSofteningen
dc.subjectChemical Softeningen
dc.subjectCalciumen
dc.subjectMagnesiumen
dc.subjectSulfateen
dc.subjectSuphateen
dc.subjectSpecific Conductanceen
dc.subjectCost Effective Sulfate Removal Processen
dc.subjectCESR Processen
dc.subjectTotal Dissolved Solidsen
dc.subjectTDSen
dc.titlePhysiochemical Treatment Options for High-Conductivity Coal Mining Runoffen
dc.typeThesisen
thesis.degree.disciplineEnvironmental Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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