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Huang Z, Li F, Cui W, Cao G, Yao J. Simulating arsenic discharge flux at a relic smelting site in Guangxi Zhuang Autonomous Region, China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:12094-12111. [PMID: 38225495 DOI: 10.1007/s11356-023-31695-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 12/20/2023] [Indexed: 01/17/2024]
Abstract
Anthropogenic groundwater arsenic (As) pollution is common in many aquifers in Southwest China. It is concerned that long-term random disposal of As smelting slag could induce the transport of high-As groundwater into previously uncontaminated aquifers. Here, we used HELP-MODFLOW-MT3DMS model simulations to integrate the percolation, groundwater flow, and solute transport processes at an aquifer at site scale, constrained by weather, hydrogeology, and monitoring data. Our simulations provide a new method framework of the simulated percolation by HELP model and have induced As spatiotemporal distribution in the aquifer. According to the HELP model simulation results, percolation volume accounts for 24% of rainfall over 18 years. This work determined that the As discharge trend was fitted by double-constants kinetics based on the leaching experiment. And this work calculates total mass distribution of As in the aquifer over 18 years. We have found that the sustained As pollution relies on the rainfall that acts as the primary contributor of elevated As concentrations. Model simulation results suggest that 51.70% of the total As mass (1.96 × 104 kg) was fixed in low permeability solid media. The total As mass discharged into groundwater reached 9.3 × 103 kg, accounting for 24.68%. The accumulative outflow mass of arsenic was 8.0 × 103 kg, accounting for 21.62%.
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Affiliation(s)
- Zhenzhong Huang
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China
| | - Fengyan Li
- School of Science, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China
| | - Weihua Cui
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China.
| | - Guoliang Cao
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China
| | - Jun Yao
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, People's Republic of China
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2
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Frederiksen M, Mosthaf K, Bøllingtoft AB, Albers CN, Christensen BSB, Christophersen M, Tuxen N, Tüchsen P, Clausen L, Janniche GAS, Bjerg PL. Predicting the impact and duration of persistent and mobile organic compounds in groundwater systems using a contaminant mass discharge approach. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 348:119199. [PMID: 37844396 DOI: 10.1016/j.jenvman.2023.119199] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 09/19/2023] [Accepted: 09/30/2023] [Indexed: 10/18/2023]
Abstract
This study investigated methods for predicting the duration and impact on groundwater quality from persistent and mobile organic compounds (PMOCs) at a drinking water well field affected by multiple contaminant sources. The fungicide metabolite N,N-dimethylsulfamide (DMS), which frequently occurs above the Danish groundwater quality criterion (0.1 μg/L), was used as an example. By combining contaminant mass discharge (CMD) estimations, modeling, and groundwater dating, a number of important discoveries were made. The current center of contaminant mass was located near the source area. The CMD at the well field was predicted to peak in 2040, and an effect from the investigated sources on groundwater quality could be expected until the end of the 21st century. A discrepancy in the current CMD at the well field and the estimated arrival time from the studied source area suggested an additional pesticide source, which has not yet been thoroughly investigated. The presence of the unknown source was supported by model simulations, producing an improved mass balance after inclusion of a contaminant source closer to the well field. The approach applied here was capable of predicting the duration and impact of DMS contamination at a well field at catchment scale. It furthermore shows potential for identification and quantification of the contribution from individual sources, and is also applicable for other PMOCs. Predicting the duration of the release and impact of contaminant sources on abstraction wells is highly valuable for water resources management and authorities responsible for contaminant risk assessment, remediation, and long-term planning at water utilities.
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Affiliation(s)
- M Frederiksen
- Ramboll, Englandsgade 25, 5000, Odense C, Denmark; Technical University of Denmark, Department of Environmental and Resource Engineering, Bygningstorvet, Building 115, 2800, Kgs. Lyngby, Denmark.
| | - K Mosthaf
- Technical University of Denmark, Department of Environmental and Resource Engineering, Bygningstorvet, Building 115, 2800, Kgs. Lyngby, Denmark
| | - A B Bøllingtoft
- Technical University of Denmark, Department of Environmental and Resource Engineering, Bygningstorvet, Building 115, 2800, Kgs. Lyngby, Denmark
| | - C N Albers
- Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350, København K, Denmark
| | | | | | - N Tuxen
- Capital Region of Denmark, Kongens Vænge 2, 3400, Hillerød, Denmark
| | - P Tüchsen
- Novafos, Blokken 9, 3460, Birkerød, Denmark
| | - L Clausen
- HOFOR, Ørestads Boulevard 35, 2300, København S, Denmark
| | | | - P L Bjerg
- Technical University of Denmark, Department of Environmental and Resource Engineering, Bygningstorvet, Building 115, 2800, Kgs. Lyngby, Denmark
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Wang Z, Yang Z, Fagerlund F, Zhong H, Hu R, Niemi A, Illangasekare T, Chen YF. Pore-Scale Mechanisms of Solid Phase Emergence During DNAPL Remediation by Chemical Oxidation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:11343-11353. [PMID: 35904865 DOI: 10.1021/acs.est.2c01311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In situ chemical oxidation (ISCO) has proven successful in the remediation of aquifers contaminated with dense nonaqueous phase liquids (DNAPLs). However, the treatment efficiency can often be hampered by the formation of solids or gas, reducing the contact between remediation agents and residual DNAPLs. To further improve the efficiency of ISCO, fundamental knowledge is needed about the complex multiphase flow and reactive transport processes as new solid and fluid phases emerge at the microscale. Here, via microfluidic experiments, we study the pore-scale dynamics of trichloroethylene degradation by permanganate. We visualize how the remediation evolves under the influence of solid phase emergence and explore the roles of injection rate, oxidant concentration, and stabilization supplement. Combining image processing, pressure analysis, and stoichiometry calculations, we provide comprehensive descriptions of the oxidant concentration-dependent growth patterns of the solid phase and their impact on the remediation efficiency. We further corroborate the stabilization mechanism provided by phosphate supplement, which is effective in inhibiting solid phase generation and thus highly beneficial for the oxidation remediation. This work elucidates the pore-scale mechanisms during remediation of chlorinated solvents with a particular context in the solid phase production and the associated effects, which is of general significance to understanding various processes in natural and engineered systems involving solid phase emergence or aggregation phenomena, such as groundwater and soil remediation.
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Affiliation(s)
- Zejun Wang
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
- Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Zhibing Yang
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
- Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Fritjof Fagerlund
- Department of Earth Sciences, Uppsala University, Villavägen 16, SE-75236 Uppsala, Sweden
| | - Hua Zhong
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Ran Hu
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
- Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Auli Niemi
- Department of Earth Sciences, Uppsala University, Villavägen 16, SE-75236 Uppsala, Sweden
| | - Tissa Illangasekare
- Department of Civil and Environmental Engineering, Center for Experimental Study of Subsurface Environmental Processes, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Yi-Feng Chen
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
- Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan 430072, China
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Underwood JC, Akob DM, Lorah MM, Imbrigiotta TE, Harvey RW, Tiedeman CR. Microbial Community Response to a Bioaugmentation Test to Degrade Trichloroethylene in a Fractured Rock Aquifer, Trenton, N.J. FEMS Microbiol Ecol 2022; 98:6617591. [PMID: 35749571 DOI: 10.1093/femsec/fiac077] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 05/12/2022] [Accepted: 06/22/2022] [Indexed: 11/12/2022] Open
Abstract
Bioaugmentation is a promising strategy for enhancing trichloroethylene (TCE) degradation in fractured rock. However, slow or incomplete biodegradation can lead to stalling at degradation byproducts such as 1,2-dichloroethene (cis-DCE) and vinyl chloride (VC). Over the course of 7 years, we examined the response of groundwater microbial populations in a bioaugmentation test where an emulsified vegetable oil solution (EOS®) and a dechlorinating consortium (KB-1®), containing the established dechlorinator Dehalococcoides, were injected into a TCE-contaminated fractured rock aquifer. Indigenous microbial communities responded within 2 days to added substrate and outcompeted KB-1®, and over the years of monitoring, several other notable turnover events were observed. Concentrations of ethene, the end product in reductive dechlorination, had the strongest correlations (p< 0.05) with members of Candidatus Colwellbacteria but their involvement in reductive dechlorination is unknown and warrants further investigation. Dehalococcoides never exceeded 0.6% relative abundance of groundwater microbial communities, despite its previously presumed importance at the site. Increased concentrations of carbon dioxide, acetic acid, and methane were positively correlated with increasing ethene concentrations; however, concentrations of cis-DCE and VC remained high by the end of the monitoring period suggesting preferential enrichment of indigenous partial dechlorinators over bioaugmented complete dechlorinators. This study highlights the importance of characterizing in situ microbial populations to understand how they can potentially enhance or inhibit augmented TCE degradation.
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Affiliation(s)
- J C Underwood
- U.S. Geological Survey, Water Mission Area, Boulder CO 80303USA
| | - D M Akob
- U.S. Geological Survey, Geology, Energy & Minerals Science Center, 12201 Sunrise Valley Drive, Mailstop 954, Reston, VA 20192USA
| | - M M Lorah
- U.S. Geological Survey, MD-DE-DC Water Science Center, 5522 Research Park Drive, Baltimore, MD 21228USA
| | - T E Imbrigiotta
- U.S. Geological Survey, New Jersey Water Science Center, 3450 Princeton Pike, Suite 110, Lawrenceville, NJ 08648USA
| | - R W Harvey
- U.S. Geological Survey, Water Mission Area, Boulder CO 80303USA
| | - C R Tiedeman
- U.S. Geological Survey, Water Mission Area, Menlo Park, CA 94025USA
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Chen WT, Chen KF, Surmpalli RY, Zhang TC, Ou JH, Kao CM. Bioremediation of trichloroethylene-polluted groundwater using emulsified castor oil for slow carbon release and acidification control. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2022; 94:e1673. [PMID: 34861087 DOI: 10.1002/wer.1673] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Revised: 10/05/2021] [Accepted: 10/26/2021] [Indexed: 06/13/2023]
Abstract
In this study, the emulsified castor oil (ECO) substrate was developed for a long-term supplement of biodegradable carbon with pH buffering capacity to anaerobically bioremediate trichloroethylene (TCE)-polluted groundwater. The ECO was produced by mixing castor oil, surfactants (sapindales and soya lecithin [SL]), vitamin complex, and a citrate/sodium phosphate dibasic buffer system together for slow carbon release. Results of the emulsification experiments and microcosm tests indicate that ECO emulsion had uniform small droplets (diameter = 539 nm) with stable oil-in-water characteristics. ECO had a long-lasting, dispersive, negative zeta potential (-13 mv), and biodegradable properties (viscosity = 357 cp). Approximately 97% of TCE could be removed with ECO supplement after a 95-day operational period without the accumulation of TCE dechlorination byproducts (dichloroethylene and vinyl chloride). The buffer system could neutralize acidified groundwater, and citrate could be served as a primary substrate. ECO addition caused an abrupt TCE adsorption at the initial stage and the subsequent removal of adsorbed TCE. Results from the next generation sequences and real-time polymerase chain reaction (PCR) indicate that the increased microbial communities and TCE-degrading bacterial consortia were observed after ECO addition. ECO could be used as a pH-control and carbon substrate to enhance anaerobic TCE biodegradation effectively. PRACTITIONER POINTS: Emulsified castor oil (ECO) contains castor oil, surfactants, and buffer for a slow carbon release and pH control. ECO can be a long-term carbon source for trichloroethylene (TCE) dechlorination without causing acidification. TCE removal after ECO addition is due to adsorption and reductive dechlorination mechanisms.
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Affiliation(s)
- Wei-Ting Chen
- Institute of Environmental Engineering, National Sun Yat-Sen University, Taiwan
| | - Ku-Fan Chen
- Department of Civil Engineering, National Chi Nan University, Taiwan
| | - Rao Y Surmpalli
- Global Institute for Energy, Environment and Sustainability, Lenexa, Kansas, USA
| | - Tian C Zhang
- Department of Civil & Environmental Engineering, University of Nebraska-Lincoln, Omaha, Nebraska, USA
| | - Jiun-Hau Ou
- Institute of Environmental Engineering, National Sun Yat-Sen University, Taiwan
| | - Chih-Ming Kao
- Institute of Environmental Engineering, National Sun Yat-Sen University, Taiwan
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Maldaner CH, Munn JD, Green BA, Warner SL, Chapman SW, Ashton A, Daubert L, Parker BL. Quantifying groundwater flow variability in a poorly cemented fractured sandstone aquifer to inform in situ remediation. JOURNAL OF CONTAMINANT HYDROLOGY 2021; 241:103838. [PMID: 34089976 DOI: 10.1016/j.jconhyd.2021.103838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 03/29/2021] [Accepted: 05/20/2021] [Indexed: 06/12/2023]
Abstract
This study applies innovative methods to characterize and quantify the magnitude of groundwater flow in a fractured and variably cemented sandstone aquifer to inform an in-situ remediation strategy for trichloroethene (TCE) contamination. A modified active-distributed temperature sensing (A-DTS) approach in which fiber optic cables were permanently grouted in the borehole was used to quantify groundwater flow rates. Two additional tracer tests were conducted: 1) fluorescein tracer injection followed by rock coring and sampling for visual mapping and porewater analysis, and 2) deployment of passive flux meters in conventional monitoring wells to evaluate groundwater velocity and mass flux distributions. Forced gradient injection of fluorescein tracer suggests a dual porosity flow system wherein higher rates of groundwater flow occur within discrete features including highly permeable bedding planes and fractures, with slower flow occurring within the rock matrix. Tracer was observed and detected in the unfractured matrix porewater >1.5 m away from the injection well. Beyond this distance, >6 m radially away from the injection hole, tracer was primarily detected within and adjacent to high transmissivity fractures serving as preferential flow paths. The Darcy flux calculated using active distributed temperature sensing (A-DTS) shows depth-discrete values ranging from 7 to 60 cm/day, with average and median values of 23 and 17 cm/day, respectively. Passive Flux Meters (PFMs) deployed in three conventional monitoring wells with slotted screens and sand filter packs showed groundwater flux values ranging from 2 to 11 cm/day, with an overall average of 4 cm/day and are likely biased low due to spreading in the sand pack. The study results were used to inform an in-situ remediation system design including the proposed injection well spacing and the amendment delivery approach. In addition, the results were used to build confidence in the viability of delivering an oxidant to the rock matrix via advective processes. This is important because 1) the matrix is where the majority of the TCE mass occurs, and 2) it provides insights on processes that directly affect remedial performance expectations given advective delivery to preferential pathways and the matrix overcomes diffusion only conditions.
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Affiliation(s)
- Carlos H Maldaner
- G360 Institute for Groundwater Research, University of Guelph, Canada.
| | - Jonathan D Munn
- G360 Institute for Groundwater Research, University of Guelph, Canada
| | | | | | - Steven W Chapman
- G360 Institute for Groundwater Research, University of Guelph, Canada
| | | | - Linda Daubert
- IBM Corporate Environmental Affairs, Manassas, VA, USA
| | - Beth L Parker
- G360 Institute for Groundwater Research, University of Guelph, Canada
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Haluska AA, Finneran KT. Increasing electron donor concentration does not accelerate complete microbial reductive dechlorination in contaminated sediment with native organic carbon. Biodegradation 2021; 32:577-593. [PMID: 34081242 DOI: 10.1007/s10532-021-09953-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 05/22/2021] [Indexed: 11/26/2022]
Abstract
Experiments with Fe(III)-rich, chloroethene-contaminated sediment demonstrated that trichloroethylene (TCE) and vinyl chloride (VC) were completely reduced to ethene regardless of whether electron donor(s) were added at 1 × stoichiometry or 10 × stoichiometry relative to all-electron acceptors. Unamended controls uniformly reduced TCE to ethene with a mean time to complete dechlorination (operationally defined as the presence of stoichiometric ethene production) of 79 days. Adding 1 × and 10 × acetate hindered the rate and extent of TCE and VC reduction relative to unamended controls, with several only partially reduced when the experiments were terminated. Adding high molecular mass (soybean oil derivative) substrates did not increase microbial reductive dechlorination relative to unamended incubations, and in many cases, hindered microbial dechlorination in favor of methanogenesis. The mean time to complete dechlorination was comparable between low (× 1) and high (× 10) electron donor concentration for all lipid-based electron donors tested. Those tested included Newman Zone® Standard without sodium lactate (96 vs. 75 days, respectively), CAP 18 ME (85 vs. 94 days, respectively), EOS 598B42 (68 vs. 72 days, respectively), and acetate (134 vs. 125 days, respectively). These data suggest that the addition of an electron donor does not always increase the rate and extent of reductive dechlorination but will increase costs. In particular, increasing the concentration of electron donors higher than the stoichiometric demand only decreased complete microbial reductive dechlorination, which is the opposite of most standard "more time and more electrons" approaches. These data argue that site-specific electron donor demands must be evaluated, and in some cases, a monitored natural attenuation (MNA) approach is most favorable.
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Affiliation(s)
- Alexander Arthur Haluska
- Environmental Engineering and Earth Sciences, Clemson University, 312 Biosystems Research Complex, 105 Collings Street, Clemson, SC, 29634, USA
- Center for Applied Geoscience, Geological Institute, University of Tϋbingen, Hölderlinstrße 12, 72070, Tübingen, Germany
| | - Kevin T Finneran
- Environmental Engineering and Earth Sciences, Clemson University, 312 Biosystems Research Complex, 105 Collings Street, Clemson, SC, 29634, USA.
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Xie T, Dang Z, Zhang J, Zhang Q, Zhang RH, Liao CJ, Lu GN. Decontamination of dense nonaqueous-phase liquids in groundwater using pump-and-treat and in situ chemical oxidation processes: a field test. RSC Adv 2021; 11:4237-4246. [PMID: 35424328 PMCID: PMC8694382 DOI: 10.1039/d0ra10010b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 01/12/2021] [Indexed: 11/25/2022] Open
Abstract
Groundwater remediation is difficult because of the complexity of the treatment area and the presence of various pollutants, and it is difficult to achieve using a single process. A combined pump-and-treat (P&T) and in situ chemical oxidation (ISCO) system was used to remove dense nonaqueous-phase liquids (DNAPLs) from groundwater at the field scale in this study. The underground water pH, electrical conductivity, dissolved oxygen concentration, and SO4 2- concentration were used as indirect evidence of in situ chemical reactions. Groundwater remediation using the P&T-ISCO process using 1.5% sodium persulfate and 0.03% sodium hydroxide had a remarkable effect on DNAPLs, and the DNAPL diffusion distance was much higher under pumping conditions than under natural conditions. During groundwater remediation, the pollutant concentration positively correlated with the pH, electrical conductivity, and dissolved oxygen concentration and negatively correlated with the SO4 2- concentration. In summary, P&T-ISCO can effectively accelerate DNAPL degradation to give efficient groundwater remediation.
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Affiliation(s)
- Tian Xie
- Institute of Environment and Energy, South China University of Technology Guangzhou 510006 PR China
- National Technology Center, Guangxi Bossco Environmental Protection Technology Co Ltd Nanning 530004 China
| | - Zhi Dang
- Institute of Environment and Energy, South China University of Technology Guangzhou 510006 PR China
| | - Jian Zhang
- Institute of Light Industry and Food Engineering, Guangxi University Nanning 53004 PR China
| | - Qian Zhang
- National Technology Center, Guangxi Bossco Environmental Protection Technology Co Ltd Nanning 530004 China
| | - Rong-Hai Zhang
- National Technology Center, Guangxi Bossco Environmental Protection Technology Co Ltd Nanning 530004 China
- College of Environmental Science and Engineering, Guilin University of Technology Guilin 541006 PR China
| | - Chang-Jun Liao
- National Technology Center, Guangxi Bossco Environmental Protection Technology Co Ltd Nanning 530004 China
| | - Gui-Ning Lu
- Institute of Environment and Energy, South China University of Technology Guangzhou 510006 PR China
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