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Xue J, Deng Y, Pi K, Fu QL, Du Y, Xu Y, Yuan X, Fan R, Xie X, Shi J, Wang Y. Enrichment of Geogenic Organoiodine Compounds in Alluvial-Lacustrine Aquifers: Molecular Constraints by Organic Matter. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:5932-5941. [PMID: 38502530 DOI: 10.1021/acs.est.3c07314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Organoiodine compounds (OICs) are the dominant iodine species in groundwater systems. However, molecular mechanisms underlying the geochemical formation of geogenic OICs-contaminated groundwater remain unclear. Based upon multitarget field monitoring in combination with ultrahigh-resolution molecular characterization of organic components for alluvial-lacustrine aquifers, we identified a total of 939 OICs in groundwater under reducing and circumneutral pH conditions. In comparison to those in water-soluble organic matter (WSOM) in sediments, the OICs in dissolved organic matter (DOM) in groundwater typically contain fewer polycyclic aromatics and polyphenol compounds but more highly unsaturated compounds. Consequently, there were two major sources of geogenic OICs in groundwater: the migration of the OICs from aquifer sediments and abiotic reduction of iodate coupled with DOM iodination under reducing conditions. DOM iodination occurs primarily through the incorporation of reactive iodine that is generated by iodate reduction into highly unsaturated compounds, preferably containing hydrophilic functional groups as binding sites. It leads to elevation of the concentration of the OICs up to 183 μg/L in groundwater. This research provides new insights into the constraints of DOM molecular composition on the mobilization and enrichment of OICs in alluvial-lacustrine aquifers and thus improves our understanding of the genesis of geogenic iodine-contaminated groundwater systems.
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Affiliation(s)
- Jiangkai Xue
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Yamin Deng
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Kunfu Pi
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Qing-Long Fu
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Yao Du
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Yuxiao Xu
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Xiaofang Yuan
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
| | - Ruiyu Fan
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Xianjun Xie
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Jianbo Shi
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Yanxin Wang
- Key Laboratory of Groundwater Quality and Health, China University of Geosciences, Ministry of Education, Wuhan 430078, China
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
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He X, Rockhold ML, Fang Y, Lawter AR, Freedman VL, Mackley RD, Qafoku NP. Experimental and Numerical Study of Radioiodine Sorption and Transport in Hanford Sediments. ACS EARTH & SPACE CHEMISTRY 2024; 8:323-334. [PMID: 38379836 PMCID: PMC10875658 DOI: 10.1021/acsearthspacechem.3c00291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/18/2023] [Accepted: 12/20/2023] [Indexed: 02/22/2024]
Abstract
Radioiodine (129I) poses a potential risk to human health and the environment at several U.S. Department of Energy sites, including the Hanford Site, located in southeastern Washington State. Experimental studies and numerical modeling were performed to provide a technical basis for field-scale modeling of iodine sorption and transport behavior. The experiments were carried out using six columns of repacked contaminated sediments from the Hanford Site. Although iodate has been determined to be the dominant iodine species at the Hanford Site, the sorption and transport behaviors of different iodine species were investigated in a series of column experiments by first leaching sediments with artificial groundwater (AGW) followed by AGW containing iodate (IO3-), iodide (I-), or organo-iodine (2-iodo-5-methoxyphenol, C7H7IO2). Ferrihydrite amendments were added to the sediments for three of the columns to evaluate the impact of ferrihydrite on 129I attenuation. The results showed that ferrihydrite enhanced the iodate sorption capacity of the sediment and retarded the transport but had little effect on iodide or organo-I, providing a technical basis for developing a ferrihydrite-based remedial strategy for iodate under oxidizing conditions. Data from the column transport experiments were modeled using the linear equilibrium Freundlich isotherm model, the kinetic Langmuir adsorption model, and a distributed rate model. Comparisons of the experimental data and modeling results indicated that sorption was best represented with the distributed rate model with rates and maximum sorption extents varying by iodine species and ferrihydrite treatment. However, the linear Freundlich isotherm (Kd) model was also found to fit the laboratory experimental data relatively well, suggesting that the Kd model could also be used to represent iodine transport at the field scale.
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Affiliation(s)
- Xiaoliang He
- Pacific
Northwest National Laboratory, Richland, Washington 99354, United States
| | - Mark L. Rockhold
- Pacific
Northwest National Laboratory, Richland, Washington 99354, United States
| | - Yilin Fang
- Pacific
Northwest National Laboratory, Richland, Washington 99354, United States
| | - Amanda R. Lawter
- Pacific
Northwest National Laboratory, Richland, Washington 99354, United States
| | - Vicky L. Freedman
- Sealaska
Technical Services, Richland, Washington 99354, United States
| | - Rob D. Mackley
- Pacific
Northwest National Laboratory, Richland, Washington 99354, United States
| | - Nikolla P. Qafoku
- Pacific
Northwest National Laboratory, Richland, Washington 99354, United States
- Department
of Civil and Environmental Engineering, University of Washington, Seattle, Washington 98195, United States
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Chen J, Wang C, Wu J, Tao S. Plutonium in sediments of the Eastern Guangdong coast-its sources and their contribution. MARINE POLLUTION BULLETIN 2023; 193:115222. [PMID: 37406399 DOI: 10.1016/j.marpolbul.2023.115222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/19/2023] [Accepted: 06/22/2023] [Indexed: 07/07/2023]
Abstract
The 239+240Pu activities and 240Pu/239Pu atom ratios of surface sediments from the Eastern Guangdong coast (EGDC) were determined by sector field ICP-MS in order to examine the sources of plutonium (Pu) and quantify their contributions. The 239+240Pu activities in the EGDC ranged from 0.113 to 0.451 Bq kg-1, with an average of 0.225 ± 0.090 Bq kg-1 (n = 17). Consistently high 240Pu/239Pu atom ratios, ranging from 0.218 to 0.274 (average = 0.254 ± 0.014, n = 17), indicate a non-global fallout Pu source in the EGDC. The horizontal distribution of the 240Pu/239Pu atom ratios in the EGDC sediment suggests the non-global fallout Pu is sourced from close-in fallout from the Pacific Proving Grounds (PPG). Using a simple two end-member mixing model, we calculated the relative proportions of Pu from the PPG and global fallout in the EGDC to be 57 ± 9 % and 43 ± 9 %, respectively. Moreover, from the well-defined relationship between 239+240Pu activity and total organic carbon content in sediments and a two end-member mixing model using δ13C, we further calculated the Terr-global fallout (riverine input) and Mar-global fallout (direct atmospheric deposition) to be 11 ± 2 % and 32 ± 6 %, respectively. Finally, from the activity levels and atom ratios of Pu isotopes in the EGDC, we established a baseline for future use in environmental risk assessment related to nuclear power plant operations.
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Affiliation(s)
- Jisheng Chen
- Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention & Institute of Marine Sciences, Shantou University, Shantou 515063, China
| | - Cui Wang
- Third Institute of Oceanography, Ministry of Natural Resource, Xiamen 361005, China
| | - Junwen Wu
- Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention & Institute of Marine Sciences, Shantou University, Shantou 515063, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China.
| | - Shuqin Tao
- Third Institute of Oceanography, Ministry of Natural Resource, Xiamen 361005, China
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Zhou Z, Zhang C, Xi M, Ma H, Jia H. Multi-scale modeling of natural organic matter-heavy metal cations interactions: Aggregation and stabilization mechanisms. WATER RESEARCH 2023; 238:120007. [PMID: 37121201 DOI: 10.1016/j.watres.2023.120007] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/17/2023]
Abstract
Interaction between natural organic matters (NOM) and heavy metal cations in aqueous environment are of great significance for maintaining stability of organic carbon and restraining transport of heavy metal contaminants in (bio)geochemical processes. We systematically explore the aggregation process and complexation between NOM and heavy metal cations (Ag+, Cd2+, Pb2+, Zn2+, Eu3+) under different pH condition by molecular dynamics (MD) simulations, umbrella sampling method, and quantum chemistry calculations. The character of molecular structures NOM-heavy metal complexes and association are quantified. In acidic pH condition, aggregation proceeds via H-bonding and π-π interactions between NOM fragments. In neutral condition, Ag+, Cd2+, Pb2+, and Eu3+ can form inner-sphere complexes with the surface carboxylic groups and therefore reduce intermolecular charge repulsion, eventually leading to NOM aggregation, and it shows that even without direct binding, the outer-sphere adsorbed Zn2+ can also result in the formation of NOM assemble through H-bonding. Consequently, these heavy metals are capable of promoting NOM aggregation regardless of the complexing ways. Complexing free energy calculations characterized the dynamic processes of cations binding to the carboxylic groups of NOM fragment and the related energy landscape. This study provides quantitative insights for understanding the environmental processes of heavy metals and cycle of C in aquatic ecosystem, and contributes to developing environment-friendly strategies for controlling heavy metal contaminants.
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Affiliation(s)
- Zhiyu Zhou
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, 712100, P.R. China
| | - Chi Zhang
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, 712100, P.R. China; Key Laboratory of Low-Carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, P.R. China.
| | - Mengning Xi
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, 712100, P.R. China
| | - Haonan Ma
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, 712100, P.R. China
| | - Hanzhong Jia
- College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi, 712100, P.R. China; Key Laboratory of Low-Carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, P.R. China.
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Lin P, Xu C, Kaplan DI, Yeager CM, Xing W, Nichols R, Santschi PH. Presence of aromatic-rich organic matter and its characterization in grout materials: Implications for radionuclide immobilization. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2023; 263:107183. [PMID: 37094504 DOI: 10.1016/j.jenvrad.2023.107183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 04/10/2023] [Accepted: 04/13/2023] [Indexed: 05/03/2023]
Abstract
Grout materials are commonly used to immobilize low-level radioactive waste. Organic moieties can be unintentionally present in common ingredients used to make these grout waste forms, which may result in the formation of organo-radionuclide species. These species can positively or negatively affect the immobilization efficiency. However, the presence of organic carbon compounds is rarely considered in models or characterized chemically. Here, we quantify the organic pool of grout formulations with and without slag, as well as the individual dry ingredients used to make the grout samples (ordinary Portland cement (OPC), slag and fly ash), including total organic carbon (TOC) and black carbon, followed by aromaticity evaluation and molecular characterization via Electro Spray Ionization Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry (ESI-FTICRMS). All dry grout ingredients contained significant amounts of organic carbon, ranging from 550 mg/kg to 6250 mg/kg for the TOC pool, with an averaged abundance of 2933 ± 2537 mg/kg, of which 60 ± 29% was composed of black carbon. The significant abundance of a black carbon pool implies the presence of the aromatic-like compounds, which was further identified by both phosphate buffer-assisted aromaticity evaluation (e.g., >1000 mg-C/kg as aromatic-like carbon in the OPC) and dichloromethane (DCM) extraction with ESI-FTICRMS analysis. Besides aromatic-like compounds, other organic moieties were also detected in the OPC, such as carboxyl-containing aliphatic molecules. While the organic compound only consists of minor fractions of the grout materials investigated, our observations of the presence of various radionuclide-binding organic moieties suggests the potential formation of organo-radionuclides, such as radioiodine, which might be present at lower molar concentrations than TOC. Evaluating the role of organic carbon complexation in controlling the disposed radionuclides, especially for those radionuclides with strong association with organic carbon, has important implications for the long-term immobilization of radioactive waste in grout systems.
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Affiliation(s)
- Peng Lin
- Savannah River Ecology Laboratory, University of Georgia, Aiken, SC, 29802, USA; Department of Marine and Coastal Environmental Science, Texas A & M University Galveston Campus, Galveston, TX, 77553, USA.
| | - Chen Xu
- Department of Marine and Coastal Environmental Science, Texas A & M University Galveston Campus, Galveston, TX, 77553, USA
| | - Daniel I Kaplan
- Savannah River Ecology Laboratory, University of Georgia, Aiken, SC, 29802, USA
| | - Chris M Yeager
- Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Wei Xing
- Savannah River Ecology Laboratory, University of Georgia, Aiken, SC, 29802, USA; Department of Marine and Coastal Environmental Science, Texas A & M University Galveston Campus, Galveston, TX, 77553, USA
| | - Ralph Nichols
- Savannah River National Laboratory, Aiken, SC, 29808, USA
| | - Peter H Santschi
- Department of Marine and Coastal Environmental Science, Texas A & M University Galveston Campus, Galveston, TX, 77553, USA
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6
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Mallya DS, Abdikheibari S, Dumée LF, Muthukumaran S, Lei W, Baskaran K. Removal of natural organic matter from surface water sources by nanofiltration and surface engineering membranes for fouling mitigation - A review. CHEMOSPHERE 2023; 321:138070. [PMID: 36775036 DOI: 10.1016/j.chemosphere.2023.138070] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 01/25/2023] [Accepted: 02/05/2023] [Indexed: 06/18/2023]
Abstract
Given that surface water is the primary supply of drinking water worldwide, the presence of natural organic matter (NOM) in surface water presents difficulties for water treatment facilities. During the disinfection phase of the drinking water treatment process, NOM aids in the creation of toxic disinfection by-products (DBPs). This problem can be effectively solved using the nanofiltration (NF) membrane method, however NOM can significantly foul NF membranes, degrading separation performance and membrane integrity, necessitating the development of fouling-resistant membranes. This review offers a thorough analysis of the removal of NOM by NF along with insights into the operation, mechanisms, fouling, and its controlling variables. In light of engineering materials with distinctive features, the potential of surface-engineered NF membranes is here critically assessed for the impact on the membrane surface, separation, and antifouling qualities. Case studies on surface-engineered NF membranes are critically evaluated, and properties-to-performance connections are established, as well as challenges, trends, and predictions for the field's future. The effect of alteration on surface properties, interactions with solutes and foulants, and applications in water treatment are all examined in detail. Engineered NF membranes containing zwitterionic polymers have the greatest potential to improve membrane permeance, selectivity, stability, and antifouling performance. To support commercial applications, however, difficulties related to material production, modification techniques, and long-term stability must be solved promptly. Fouling resistant NF membrane development would be critical not only for the water treatment industry, but also for a wide range of developing applications in gas and liquid separations.
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Affiliation(s)
| | | | - Ludovic F Dumée
- Department of Chemical Engineering, Khalifa University, Abu Dhabi, United Arab Emirates; Research and Innovation Center on CO2 and Hydrogen, Khalifa University, Abu Dhabi, United Arab Emirates; Center for Membrane and Advanced Water Technology, Khalifa University, Abu Dhabi, United Arab Emirates
| | - Shobha Muthukumaran
- Institute for Sustainable Industries & Liveable Cities, College of Engineering and Science, Victoria University, Melbourne, VIC, 8001, Australia
| | - Weiwei Lei
- Institute of Frontier Materials, Deakin University, Waurn Ponds, Geelong, Victoria. 3220, Australia
| | - Kanagaratnam Baskaran
- School of Engineering, Deakin University, Waurn Ponds, Geelong, Victoria, 3216, Australia
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Kaplan DI, Nichols R, Xu C, Lin P, Yeager C, Santschi PH. Large seasonal fluctuations of groundwater radioiodine speciation and concentrations in a riparian wetland in South Carolina. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 816:151548. [PMID: 34780820 DOI: 10.1016/j.scitotenv.2021.151548] [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] [Received: 05/15/2021] [Revised: 10/15/2021] [Accepted: 11/05/2021] [Indexed: 06/13/2023]
Abstract
Recent studies evaluating multiple years of groundwater radioiodine (129I) concentration in a riparian wetland located in South Carolina, USA identified strong seasonal concentration fluctuations, such that summer concentrations were much greater than winter concentrations. These fluctuations were observed only in the wetlands but not in the upland portion of the plume and only with 129I, and not with other contaminants of anthropogenic origin: nitrate/nitrite, strontium-90, technecium-99, tritium, or uranium. This unexplained observation was hypothesized to be the result of strongly coupled processes involving hydrology, water temperature, microbiology, and chemistry. To test this hypothesis, an extensive historical groundwater database was evaluated, and additional measurements of total iodine and iodine speciation were made from recently collected samples. During the summer, the water table decreased by as much as 0.7 m, surface water temperature increased by as much as 15 °C, and total iodine concentrations were consistently greater (up to 680%) than the following winter months. Most of the additional iodine observed in the summer could be attributed to proportional gains in organo-iodine, and not iodide or iodate. Furthermore, 129I concentrations were observed to be two-orders-of-magnitude greater at the bottom of the upland aquifer than at the top. A coupled hydrological and biogeochemical conceptual model is proposed to tie these observations together. First, as the surface water temperature increased during the summer, microbial activity was enhanced, which in turn stimulated the formation of mobile organo-I. Hydrological processes were also likely involved in the observed iodine seasonal changes: (1) as the water table decreased in summer, the remaining upland water entering the wetland was comprised of a greater proportion of water containing elevated iodine concentrations from the low depths, and (2) water flow paths in summer changed such that the wells intercepted more of the contaminant plume and less of the diluting rainwater (due to evapotranspiration) and streamwater (as the lower levels promote a predominantly recharging system). These results underscore the importance of coupled processes influencing contaminant concentrations, and the need to assess seasonal contaminant variations to optimize long-term monitoring programs of wetlands.
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Affiliation(s)
- Daniel I Kaplan
- Savannah River National Laboratory, Aiken, SC 29808, United States.
| | - Ralph Nichols
- Savannah River National Laboratory, Aiken, SC 29808, United States
| | - Chen Xu
- Department of Marine Sciences, Texas A&M University, Galveston, TX 77551, United States
| | - Peng Lin
- Department of Marine Sciences, Texas A&M University, Galveston, TX 77551, United States
| | - Chris Yeager
- Los Alamos National Laboratory, Los Alamos, NM 87545, United States
| | - Peter H Santschi
- Department of Marine Sciences, Texas A&M University, Galveston, TX 77551, United States
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Aendo P, Mingkhwan R, Senachai K, Santativongchai P, Thiendedsakul P, Tulayakul P. Health significant alarms of toxic carcinogenic risk consumption of blood meal metals contamination in poultry at a gold mining neighborhood, northern Thailand. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2022; 44:783-797. [PMID: 34057663 DOI: 10.1007/s10653-021-00971-6] [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: 11/29/2020] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
The proposes of this study were to compare THg (total mercury), Pb(Lead), Cd(Cadmium), and Mn (Manganese) contamination in poultry blood between polluted areas (≤ 25 km) and unpolluted areas (> 25 km) adjacent to the largest gold mining in northern Thailand. The THg level in the free-grazing duck in polluted areas was significantly higher than unpolluted area. Both THg and Pb levels in free-grazing duck were also highest in polluted areas. In contrast, the level of (Mn) in chicken blood was the highest in polluted areas. Cadmium in farmed duck from polluted areas was significantly higher than unpolluted areas. The target hazard quotient (THQ) and hazard index (HI) of Hg, Pb, Cd, and Mn in all age groups in both areas did not exceed 1, meaning there is no possibility of the non-carcinogenic toxicity. Whereas, the incremental lifetime cancer risk (ILCR) of both Pb and Cd exceeded 1 × 10-4 in all age groups and these were particularly higher in the polluted area and considered to yield significant health effects of increasing the cancer risk. The ILCR in descending order for Pb and Cd was 13-18 years old = 18-35 years old > 6-13 years old = 35-65 years old > 3-6 years old > 65 up years old, respectively. The results revealed that the human cancer risk related to consuming poultry blood contaminated with both Pb and Cd in all age groups must be of concern, especially 13-18 and 18-35 years, it must be recommended to avoid raising animals in contaminated areas, especially free-grazing duck.
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Affiliation(s)
- Paweena Aendo
- Graduate Student, Animal Health and Biomedical Science, Faculty of Veterinary Medicine, Kasetsart University, Bangkok, 10900, Thailand
| | - Rachaneekorn Mingkhwan
- Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | | | - Pitchaya Santativongchai
- Bio-Veterinary Sciences (International Program), Faculty of Veterinary Medicine, Kasetsart University, Bangkok, 10900, Thailand
| | - Piriyaporn Thiendedsakul
- Faculty of Veterinary Medicine, Animal Health and Biomedical Science, Kasetsart University, Bangkok, 10900, Thailand
| | - Phitsanu Tulayakul
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Kasetsart University Kamphaeng Saen Campus, Nakhon Pathom, 73140, Thailand.
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Alleviation of Ultrafiltration Membrane Fouling by ClO2 Pre-Oxidation: Fouling Mechanism and Interface Characteristics. MEMBRANES 2022; 12:membranes12010078. [PMID: 35054604 PMCID: PMC8779104 DOI: 10.3390/membranes12010078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 12/31/2021] [Accepted: 01/05/2022] [Indexed: 11/17/2022]
Abstract
In order to alleviate membrane fouling and improve removal efficiency, a series of pretreatment technologies were applied to the ultrafiltration process. In this study, ClO2 was used as a pre-oxidation strategy for the ultrafiltration (UF) process. Humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA) were used as three typical organic model foulants, and the mixture of the three substances was used as a representation of simulated natural water. The dosages of ClO2 were 0.5, 1, 2, 4, and 8 mg/L, with 90 min pre-oxidation. The results showed that ClO2 pre-oxidation at low doses (1–2 mg/L) could alleviate the membrane flux decline caused by humus, polysaccharides, and simulated natural water, but had a limited alleviating effect on the irreversible resistance of the membrane. The interfacial free energy analysis showed that the interaction force between the membrane and the simulated natural water was also repulsive after the pre-oxidation, indicating that ClO2 pre-oxidation was an effective way to alleviate cake layer fouling by reducing the interaction between the foulant and the membrane. In addition, ClO2 oxidation activated the hidden functional groups in the raw water, resulting in an increase in the fluorescence value of humic analogs, but had a good removal effect on the fluorescence intensity of BSA. Furthermore, the membrane fouling fitting model showed that ClO2, at a low dose (1 mg/L), could change the mechanism of membrane fouling induced by simulated natural water from standard blocking and cake layer blocking to critical blocking. Overall, ClO2 pre-oxidation was an efficient pretreatment strategy for UF membrane fouling alleviation, especially for the fouling control of HA and SA at low dosages.
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10
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Predicting degradation of organic molecules in cementitious media. PROGRESS IN NUCLEAR ENERGY 2021. [DOI: 10.1016/j.pnucene.2021.103888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Février L, Coppin F, Pierrisnard S, Bourdillon M, Nguyen LV, Zaiter N, Brandès S, Sladkov V, Chambron JC, Meyer M. Efficiency of dihydroxamic and trihydroxamic siderochelates to extract uranium and plutonium from contaminated soils. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2021; 235-236:106645. [PMID: 34020181 DOI: 10.1016/j.jenvrad.2021.106645] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 04/30/2021] [Accepted: 05/05/2021] [Indexed: 05/29/2023]
Abstract
Actinide-based mineral phases occurring in contaminated soils can be solubilized by organic chelators excreted by plants, such as citrate. Herein, the efficiency of citrate towards U and Pu extraction is compared to that of siderophores, whose primary function is the acquisition of iron(III) as an essential nutrient and growth factor for many soil microorganisms. To that end, we selected desferrioxamine B (DFB) as an emblematic bacterial trishydroxamic siderophore and a synthetic analog, abbreviated (LCy,Pr)H2, of the tetradentate rhodotorulic acid (RA) produced by yeasts. Firstly, the uranyl speciation with both ligands was assessed in the pH range 2-11 by potentiometry and visible absorption spectrophotometry. Equilibrium constants and absorption spectra for three [UO2(DFB)Hh](h-1)+ (h = 1-3) and five [UO2(LCy,Pr)lHh](2+h-2l)+ (-1 ≤ h ≤ 1 for l = 1 and h = 0-1 for l = 2) solution complexes were determined at 25.0 °C and I = 0.1 M KNO3. Similar studies for the Fe3+/(LCy,Pr)2- system revealed the formation of five species having [Fe(LCy,Pr)]+, [Fe(LCy,Pr)OH], [Fe(LCy,Pr)(OH)2]-, [Fe(LCy,Pr)2H], and [Fe2(LCy,Pr)3] compositions. Then, the ability of DFB, (LCy,Pr)H2, and citrate to solubilize either U or Pu from pitchblende-rich soils (soils 1 and 2) or freshly plutonium-contaminated soils (LBS and PG) was evaluated by performing batch extraction tests. U was extracted significantly only by citrate after a day. After one week, the amount of U complexed by citrate only slightly exceeded that measured for the siderochelates, following the order citrate > (LCy,Pr)H2 ≥ DFB ≈ H2O, and were comparatively very low. Pu was also more efficiently extracted by citrate than by DFB after a day, but only by a factor of ~2-3 for the PG soil, while the Pu concentration in the supernatant after one week was approximately the same for both natural chelators. It remained nearly constant for DFB between the 1st and 7th day, but drastically decreased in the case of citrate, suggesting chemical decomposition in the latter case. For the Fe-rich soils 1 and 2, the efficiencies of the three chelators to solubilize Fe after a day were of the same order of magnitude, decreasing in the order DFB > citrate > (LCy,Pr)H2. However, after a week DFB had extracted ~1.5 times more Fe, whereas the amount extracted by the other chelators stayed constant. For the less Fe-rich LBS and PG soils contaminated by Pu, the amounts of extracted Fe were higher, especially after 7 days, and the DFB outperformed citrate by a factor of nearly 3. The higher capacity of the hexadentate DFB to extract Pu in the presence of Fe and its lower ability to mobilize U qualitatively agree with the respective complexation constant ratios, keeping in mind that both Pu-containing soils had a lower iron loading. Noticeably, (LCy,Pr)H2 has roughly the same capacity as DFB to solubilize U, but it mobilizes less Fe than the hexadentate siderophore. Similarly, citrate has the highest capacity to extract Pu, but the lowest to extract Fe. Therefore, compared to DFB, (LCy,Pr)H2 shows a better U/Fe extraction selectivity and citrate shows a better Pu/Fe selectivity.
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Affiliation(s)
- Laureline Février
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV/SRTE/LR2T, BP 3, 13115, Saint-Paul-Lez-Durance Cedex, France.
| | - Frédéric Coppin
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV/SRTE/LR2T, BP 3, 13115, Saint-Paul-Lez-Durance Cedex, France
| | - Sylvie Pierrisnard
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV/SRTE/LR2T, BP 3, 13115, Saint-Paul-Lez-Durance Cedex, France
| | - Mélanie Bourdillon
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR 6302, CNRS, Université Bourgogne-Franche-Comté, 9 avenue Alain Savary, BP 47870, 21078, Dijon Cedex, France
| | - Lé Vi Nguyen
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR 6302, CNRS, Université Bourgogne-Franche-Comté, 9 avenue Alain Savary, BP 47870, 21078, Dijon Cedex, France
| | - Nissrine Zaiter
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR 6302, CNRS, Université Bourgogne-Franche-Comté, 9 avenue Alain Savary, BP 47870, 21078, Dijon Cedex, France
| | - Stéphane Brandès
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR 6302, CNRS, Université Bourgogne-Franche-Comté, 9 avenue Alain Savary, BP 47870, 21078, Dijon Cedex, France
| | - Vladimir Sladkov
- Laboratoire de Physique des 2 Infinis Irène Joliot Curie (IJCLab), UMR 9012, CNRS/IN2P3 Université Paris-Saclay, Université de Paris, 15 rue Georges Clemenceau, 91405, Orsay, France
| | - Jean-Claude Chambron
- Institut de Chimie de Strasbourg, UMR 7177, CNRS, Université de Strasbourg, 1 rue Blaise Pascal, BP 296 R 8, 67008, Strasbourg Cedex, France
| | - Michel Meyer
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB), UMR 6302, CNRS, Université Bourgogne-Franche-Comté, 9 avenue Alain Savary, BP 47870, 21078, Dijon Cedex, France.
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Mahato JK, Gupta SK. Exceptional adsorption of different spectral indices of natural organic matter (NOM) by using cerium oxide nanoparticles (CONPs). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:45496-45505. [PMID: 33866502 DOI: 10.1007/s11356-021-13964-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 04/12/2021] [Indexed: 06/12/2023]
Abstract
In this study, the efficiency of cerium oxide nanoparticles (CONPs) was examined for the adsorptive removal of various spectral indices of Natural Organic Matter (NOM). Two methods, viz. efficient microwave combustion (ECM) and hydroxide mediated approach (HMA), were used to synthesize CONPs. The developed materials were characterized by the field emission scanning electron microscope (FESEM) with energy dispersive X-ray (EDX) and the Fourier transform infrared spectroscopy (FTIR). Moreover, the X-ray powder diffraction (XRD) confirmed the cubic structure with an average crystal size of 20.16 nm (CONP-I) and 6.75 nm (CONP-II). The observed point of zero (pHPZC) charge was approximately 7.0. The enhanced BET surface area (85.43 m2/g, 78.59 m2/g) and pore volume (0.007310 cm3/g, 0.006761 cm3/g) of CONPs support the higher adsorption. The effect of operational parameters (pH, contact time, and adsorbent dosage) and thermodynamical aspects of adsorption was also investigated. The Temkin isotherms described the experimental data better, with a maximum adsorption capacity of 238.9 mg/g (CONP-I) at neutral pH. Further, the experimental data can better be modeled by the pseudo-second-order kinetics (R2, 0.9851). Overall, CONPs possess great efficiency for the simultaneous removal of DOC (94%), UV254 (93%), adsorption slop index (ASI) (95%), phenolic content (88%), and carboxylic content (73%).
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Affiliation(s)
- Jaydev Kumar Mahato
- Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, 826004, India
| | - Sunil Kumar Gupta
- Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, 826004, India.
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Köse-Mutlu B. Natural organic matter and sulphate elimination from rainwater with nanofiltration technology and process optimisation using response surface methodology. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2021; 83:580-594. [PMID: 33600363 DOI: 10.2166/wst.2020.591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In the current study, the effect of operating conditions including membrane characteristics and applied pressure on natural organic matter and sulphate removal of nanofiltration (NF) membranes for drinking water production was investigated. Water stress has been increasing all over the world due to population growth, climate change, and pollution; rainwater management stands out as one of the key solutions to this problem. Nanofiltration to treat rainwater stored in a cistern was studied. The objectives were sufficient treatment performance to overcome the taste problem and lower energy consumption. In this regard, three commercial nanofiltration membranes (NP010, NP030, and NF90) were used for the experiments carried out at 6-12 bar operating pressure regarding the response surface methodology. The correlation among the results of experiments and the model parameters were also calculated for all steps. According to the results, the effect of membrane characteristics was more abundant than the effect of the operating pressure. Finally, over 99% of natural organic matter and sulphate were eliminated in the optimum conditions. The results showed that it is possible to obtain treated rainwater with desired qualities, in a non-continuous NF plant operated at the pressure of 6 bar to reuse the rainwater and achieve water sustainability.
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Affiliation(s)
- Börte Köse-Mutlu
- Civil Engineering Department, Yeditepe University, 34755 Maslak, Istanbul, Turkey and National Research Center on Membrane Technologies, Istanbul Technical University, 34469 Maslak, Istanbul, Turkey E-mail:
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Neeway JJ, Kaplan DI, Bagwell CE, Rockhold ML, Szecsody JE, Truex MJ, Qafoku NP. A review of the behavior of radioiodine in the subsurface at two DOE sites. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 691:466-475. [PMID: 31323591 DOI: 10.1016/j.scitotenv.2019.07.146] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 07/10/2019] [Accepted: 07/10/2019] [Indexed: 06/10/2023]
Abstract
Multiple processes affect the fate of the radioactive isotope 129I in the environment. Primary categories of these processes include electron transfer reactions mediated by minerals and microbes, adsorption to sediments, interactions with organic matter, co-precipitation, and volatilization. A description of dominant biogeochemical processes is provided to describe the interrelationship of these processes and the associated iodine chemical species. The majority of the subsurface iodine fate and transport studies in the United States have been conducted at U.S. Department of Energy (DOE) sites where radioisotopes of iodine are present in the environment and stored waste. The DOE Hanford Site and Savannah River Site (SRS) are used to illustrate how the iodine species and dominant processes at a site are controlled by the prevailing site biogeochemical conditions. These sites differ in terms of climate (arid vs. sub-tropical), major geochemical parameters (e.g., pH ~7.5 vs. 4), and mineralogy (carbonate vs. Fe/Al oxide dominated). The iodine speciation and dominant processes at a site also have implications for selection and implementation of suitable remedy approaches for 129I.
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Affiliation(s)
- James J Neeway
- Pacific Northwest National Laboratory, Richland, WA, United States of America
| | - Daniel I Kaplan
- Savannah River National Laboratory, Aiken, SC, United States of America
| | | | - Mark L Rockhold
- Pacific Northwest National Laboratory, Richland, WA, United States of America
| | - James E Szecsody
- Pacific Northwest National Laboratory, Richland, WA, United States of America
| | - Michael J Truex
- Pacific Northwest National Laboratory, Richland, WA, United States of America
| | - Nikolla P Qafoku
- Pacific Northwest National Laboratory, Richland, WA, United States of America.
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Li D, Xu C, Yeager CM, Lin P, Xing W, Schwehr KA, Chen N, Arthur Z, Kaplan DI, Santschi PH. Molecular Interaction of Aqueous Iodine Species with Humic Acid Studied by I and C K-Edge X-ray Absorption Spectroscopy. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:12416-12424. [PMID: 31553176 DOI: 10.1021/acs.est.9b03682] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Iodine-129 is one of three key risk drivers at several US Department of Energy waste management sites. Natural organic matter (NOM) is thought to play important roles in the immobilization of aqueous iodide (I-) and iodate (IO3-) in the environment, but molecular interactions between NOM and iodine species are poorly understood. In this work, we investigated iodine and carbon speciation in three humic acid (HA)-I systems using I K-edge XANES and EXAFS and C K-edge XANES spectroscopy: (1) I- in the presence of laccase (an oxidase enzyme) and a mediator, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in a pH 4 buffer, (2) I- in the presence of lactoperoxidase (LPO) and H2O2 in a pH 7 buffer, and (3) IO3- in a pH 3 groundwater. Both oxidase and peroxidase systems could oxidize I- to I2 or hypoiodide (HOI) leading to organo-I formation. However, the laccase-ABTS mediator was the most effective and enhanced I- uptake by HA up to 13.5 mg/g, compared to 1.9 mg/g for the LPO-H2O2. IO3- was abiotically reduced to I2 or HOI leading to an organo-I formation. Pathways for HA iodination include covalent modification of aromatic-type rings by I2 / HOI or iodine incorporation into newly formed benzoquinone species arising from the oxidation of phenolic C species. This study improves our molecular-level understanding of NOM-iodine interactions and stresses the important role that mediators may play in the enzymatic reactions between iodine and NOM.
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Affiliation(s)
- Dien Li
- Savannah River National Laboratory , Aiken , South Carolina 29808 , United States
| | - Chen Xu
- Department of Marine Science, Texas A & M University at Galveston , Galveston , Texas 77551 , United States
| | - Chris M Yeager
- Los Alamos National Laboratory , Los Alamos , New Mexico 87545 , United States
| | - Peng Lin
- Department of Marine Science, Texas A & M University at Galveston , Galveston , Texas 77551 , United States
| | - Wei Xing
- Department of Marine Science, Texas A & M University at Galveston , Galveston , Texas 77551 , United States
| | - Kathleen A Schwehr
- Department of Marine Science, Texas A & M University at Galveston , Galveston , Texas 77551 , United States
| | - Ning Chen
- Canadian Light Source Inc. , Saskatoon , Saskatchewan S7N 2V3 , Canada
| | - Zachary Arthur
- Canadian Light Source Inc. , Saskatoon , Saskatchewan S7N 2V3 , Canada
| | - Daniel I Kaplan
- Savannah River National Laboratory , Aiken , South Carolina 29808 , United States
| | - Peter H Santschi
- Department of Marine Science, Texas A & M University at Galveston , Galveston , Texas 77551 , United States
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Takeda A, Unno Y, Tsukada H, Takaku Y, Hisamatsu S. SPECIATION OF IODINE IN SOIL SOLUTION IN FOREST AND GRASSLAND SOILS IN ROKKASHO, JAPAN. RADIATION PROTECTION DOSIMETRY 2019; 184:368-371. [PMID: 31034563 DOI: 10.1093/rpd/ncz103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The behaviour of I in soil depends on its chemical form in soil solution. Stable I (127I) in the soil solution under actual soil conditions was investigated as a natural analogue of long-lived radioiodine (129I). Soil samples were collected at 5-cm depth intervals down to 20 cm from forests and grasslands in Rokkasho, where the Japanese first commercial nuclear fuel reprocessing plant is located, and the soil solution was extracted by centrifugation. Almost half of total I in the soil solution was iodide, and the other half was dissolved organic I (DOI), with iodate under the detection limit. The proportion of DOI in total I at 0-5 cm depth was larger than the proportions at 5-20 cm depth. The concentration of DOI was positively correlated with that of DOC in the soil solution, suggesting that the behaviour of DOI in the surface soil is affected by labile organic matter dynamics.
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Affiliation(s)
- A Takeda
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
| | - Y Unno
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
| | - H Tsukada
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
| | - Y Takaku
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
| | - S Hisamatsu
- Department of Radioecology, Institute for Environmental Sciences, Rokkasho, Japan
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Adusei-Gyamfi J, Ouddane B, Rietveld L, Cornard JP, Criquet J. Natural organic matter-cations complexation and its impact on water treatment: A critical review. WATER RESEARCH 2019; 160:130-147. [PMID: 31136847 DOI: 10.1016/j.watres.2019.05.064] [Citation(s) in RCA: 105] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 05/18/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
The quality and quantity of natural organic matter (NOM) has been observed to evolve which poses challenges to water treatment facilities. Even though NOM may not be toxic itself, its presence in water has aesthetic effects, enhances biological growth in distribution networks, binds with pollutants and controls the bioavailability of trace metals. Even though NOM has heterogeneous functional groups, the predominant ones are the carboxyl and the phenolic groups, which have high affinities for metals depending on the pH. The properties of both the NOM and the trace elements influence the binding kinetics and preferences. Ca2+ prefers to bind with the carboxylic groups especially at a low pH while Zn2+ prefers the amine groups though practically, most cations bind to several functions groups. The nature of the chemical environment (neighboring ligands) the ligand finds itself equally influences its preference for a cation. The presence of NOM, cations or a complex of NOM-cations may have significant impact on the efficiency of water processes such as coagulation, adsorption, ion exchange resin and membrane filtration. In coagulation, the complexation between the coagulant salts and NOM helps to remove NOM from solution. This positive influence can further be enhanced by the addition of Ca2+. A negative influence is however, observed in lime-softening method as NOM complexes with Ca2+. A negative influence is also seen in membrane filtration where divalent cations partially neutralize the carboxyl functional groups of NOM thereby reducing the repulsion effect on NOM and increasing membrane fouling. The formation of disinfection by-products could either be increased or reduced during chlorination, the speciation of products formed is modified with generally the enhancement of haloacetic acid formation observed in presence of metal cations. This current work, presents in details the interactions of cations and NOM in the environment, the preference of cations for each functional group and the possible competition between cations for binding sites, as well as the possible impacts of the presence of cations, NOM, or their complex on water treatment processes.
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Affiliation(s)
- Junias Adusei-Gyamfi
- Univ. Lille CNRS, UMR 8516 - LASIR, Equipe Physico-Chimie de L'Environnement, F-59000, Lille, France; Delft University of Technology - Faculty of Civil Engineering and Geosciences - Department of Water Management, the Netherlands
| | - Baghdad Ouddane
- Univ. Lille CNRS, UMR 8516 - LASIR, Equipe Physico-Chimie de L'Environnement, F-59000, Lille, France
| | - Luuk Rietveld
- Delft University of Technology - Faculty of Civil Engineering and Geosciences - Department of Water Management, the Netherlands
| | - Jean-Paul Cornard
- Univ. Lille CNRS, UMR 8516 - LASIR, Equipe Physico-Chimie de L'Environnement, F-59000, Lille, France
| | - Justine Criquet
- Univ. Lille CNRS, UMR 8516 - LASIR, Equipe Physico-Chimie de L'Environnement, F-59000, Lille, France.
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Temporal changes of geochemistry and microbial community in low and intermediate level waste (LILW) repository, South Korea. ANN NUCL ENERGY 2019. [DOI: 10.1016/j.anucene.2019.01.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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19
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Kaplan DI, Price KA, Xu C, Li D, Lin P, Xing W, Nichols R, Schwehr K, Seaman JC, Ohnuki T, Chen N, Santschi PH. Iodine speciation in a silver-amended cementitious system. ENVIRONMENT INTERNATIONAL 2019; 126:576-584. [PMID: 30852445 DOI: 10.1016/j.envint.2019.02.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 02/02/2019] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
Silver-impregnated zeolite (AgIZ) has been used for removing radioiodine from contaminated groundwater and nuclear waste streams and the worldwide inventory of such secondary waste is rapidly increasing. The objective of this study was to 1) quantify the effectiveness of two grout waste forms for disposing of the used AgIZ, and 2) determine the I speciation leached from AgIZ encapsulated in grout. A 60-day kinetics batch experiment demonstrated that AgIZ encapsulated in slag-free grout was extremely effective at immobilizing I and Ag, a potential non-radioactive carcinogen. However, AgIZ encapsulated in slag-containing grout, the most common type of grout used for low-level radioactive waste disposal, was entirely ineffective at immobilizing I. While the slag-free grout with AgIZ released only 3.3 μg/L Itotal into the contact solution, the slag-containing grout released 19,269 μg/L Itotal. Based on thermodynamic calculations, the strongly reducing conditions of the slag-containing system (Eh was -392 mV) promoted the reductive dissolution of the AgI, forming Ag0(aq) and releasing iodide (I-) into the aqueous phase. The slag-free grout system was maintained under more oxidizing conditions (Eh was 439 mV) and a minimal amount of I was released from the grout. In both grout systems, the aqueous I, originally added to the AgZ as iodide, was composed primarily of iodide and org-I, and essentially no iodate was detected. More organo-I was detected in the slag-free than the slag-containing grout system because the high redox potential of the former system was more conducive to the formation of oxidized I species, such as I2, which may be intermediates in the covalent bonding of I with organic C in grout. Iodine K-edge XANES analysis indicated that I existed exclusively as silver iodide in both AgIZ-grout samples. Together, these results indicate that subsurface grout disposal of AgIZ waste should be done under oxidizing conditions and that radioiodide released from AgIZ can undergo speciation transformations that have important implications on subsequent mobility and estimated risk.
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Affiliation(s)
- Daniel I Kaplan
- Savannah River National Laboratory, Aiken, SC 29808, United States.
| | - Kimberly A Price
- Savannah River Ecology Laboratory, University of Georgia, Aiken, SC 29802, United States
| | - Chen Xu
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77553, United States
| | - Dien Li
- Savannah River National Laboratory, Aiken, SC 29808, United States
| | - Peng Lin
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77553, United States
| | - Wei Xing
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77553, United States
| | - Ralph Nichols
- Savannah River National Laboratory, Aiken, SC 29808, United States
| | - Kathleen Schwehr
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77553, United States
| | - John C Seaman
- Savannah River Ecology Laboratory, University of Georgia, Aiken, SC 29802, United States
| | - Toshihiko Ohnuki
- Laboratory for Advance Nuclear Energy, Insitute of Innovative Research, Tokyo Institute of Technology, Tokyo, Japan
| | - Ning Chen
- Canadian Light Source, Saskatoon, SK S7N 0X4, Canada
| | - Peter H Santschi
- Department of Marine Science, Texas A & M University at Galveston, Galveston, TX 77553, United States
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Interaction of Arsenic Species with Organic Ligands: Competitive Removal from Water by Coagulation-Flocculation-Sedimentation (C/F/S). Molecules 2019; 24:molecules24081619. [PMID: 31022881 PMCID: PMC6515111 DOI: 10.3390/molecules24081619] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 04/18/2019] [Accepted: 04/22/2019] [Indexed: 11/26/2022] Open
Abstract
The co-occurrence of arsenic (As) and organic ligands in water bodies has raised environmental concerns due to their toxicity and adverse effects on human health. The present study aims to elucidate the influences of hydrophobic/hydrophilic organic ligands, such as humic acid (HA) and salicylic acid (SA), on the interactive behavior of As species in water. Moreover, the competitive removal behaviors of As(III, V) species and total organic carbon (TOC) were systematically investigated by coagulation-flocculation-sedimentation (C/F/S) under various aqueous matrices. The results showed the stronger binding affinity of As(V) than As(III) species, with a higher complexation ability of hydrophobic ligands than hydrophilic. The media containing hydrophilic ligands require smaller ferric chloride (FC) doses to achieve the higher As(III, V) removal, while the optimum FC dose required for As(III) removal was found to be higher than that for As(V). Moreover, hydrophobic ligands showed higher TOC removal than hydrophilic ligands. The pronounced adverse effect of a higher concentration of hydrophobic ligands on the removal efficiencies of As(V) and TOC was observed. The adsorption of As(V) on Fe precipitates was better fitted with the Langmuir model but the Freundlich isotherm was more suitable for As(III) in the presence of hydrophilic SA. Moreover, TOC removal was substantially decreased in the As(V) system as compared to the As(III) system due to the dissolution of Fe precipitates at higher As(V) concentrations. The results of FC composite flocs demonstrated that the combined effect of oxidation, charge neutralization and adsorption played an important role in the removal of both toxicants during the C/F/S process. In summary, the findings of the present study provide insights into the fate, mobility and competitive removal behavior of As(III, V) species and organic ligands in the water treatment process.
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El Zrelli R, Rabaoui L, Abda H, Daghbouj N, Pérez-López R, Castet S, Aigouy T, Bejaoui N, Courjault-Radé P. Characterization of the role of phosphogypsum foam in the transport of metals and radionuclides in the Southern Mediterranean Sea. JOURNAL OF HAZARDOUS MATERIALS 2019; 363:258-267. [PMID: 30308365 DOI: 10.1016/j.jhazmat.2018.09.083] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 09/28/2018] [Accepted: 09/29/2018] [Indexed: 06/08/2023]
Abstract
The Gabes Gulf had received huge quantities of phosphogypsum discharged from fertilizer plants. Dumping phosphogypsum in coastal waters leads to the formation of foam layers which can float on the surface and be passively transported to distant areas. This is the first attempt at geochemical and mineralogical characterization of these industrial foams in order to understand their role in the dynamic and behavior of contaminants in marine environment. Chemically, phosphogypsum foams (PGFs) are heavily loaded with radiochemical contaminants. Their mineralogical composition showed a prevalence of synthetic gypsum followed by other secondary minerals including halite, quartz, dolomite, sphalerite-Cd and fluorapatite. PGFs are rich in organic matter (OM), precursor of their formation. Once released in gypseous water, the OM in solution undergoes agglomeration, cementing and flotation steps leading to the formation of floating foams. The foams' OM was found to control the mobility of industrial contaminants contributing then to the marine environment pollution. Consequently, PGFs are the main accumulating, transporting and dispersion agent of phosphogypsum radiochemical contaminants. Thus, PGFs removal has the potential to reduce enormously the dynamics of contaminants transferred from the fertilizer plants to the aquatic environment, reducing thus their impacts on the marine environment and health status in Gabes.
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Affiliation(s)
- Radhouan El Zrelli
- Géosciences Environnement Toulouse (GET), Université de Toulouse, UMR 5563 CNRS/UPS/IRD/CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France; Institut National Agronomique de Tunis (INAT), Université de Carthage, 43 Avenue Charles Nicolle, 1082 Tunis Maharajène, Tunisia.
| | - Lotfi Rabaoui
- University of Tunis El Manar, Faculty of Science of Tunis, Laboratory of Biodiversity, Parasitology and Aquatic Ecosystems (LR18ES05), University Campus, 2092 Tunis, Tunisia; Marine Studies Section, Center for Environment and Water, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia
| | - Heithem Abda
- Université de Monastir, Faculté des Sciences de Monastir, Laboratoire de Chimie Hétérocyclique, Produits Naturels et Réactivités, Avenue de l'Environnement, 5000 Monastir, Tunisia
| | - Nabil Daghbouj
- Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 120 00 Prague 2, Czech Republic
| | - Rafael Pérez-López
- Department of Earth Sciences & Research Center on Natural Resources, Health and the Environment, University of Huelva, Campus 'El Carmen', 21071 Huelva, Spain
| | - Sylvie Castet
- Géosciences Environnement Toulouse (GET), Université de Toulouse, UMR 5563 CNRS/UPS/IRD/CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France
| | - Thierry Aigouy
- Géosciences Environnement Toulouse (GET), Université de Toulouse, UMR 5563 CNRS/UPS/IRD/CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France
| | - Nejla Bejaoui
- Institut National Agronomique de Tunis (INAT), Université de Carthage, 43 Avenue Charles Nicolle, 1082 Tunis Maharajène, Tunisia
| | - Pierre Courjault-Radé
- Géosciences Environnement Toulouse (GET), Université de Toulouse, UMR 5563 CNRS/UPS/IRD/CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France
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22
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Morrison KD, Jiao Y, Kersting AB, Zavarin M. Reduction of Plutonium(VI) to (V) by Hydroxamate Compounds at Environmentally Relevant pH. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:6448-6456. [PMID: 29767970 DOI: 10.1021/acs.est.8b00164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Natural organic matter is known to influence the mobility of plutonium (Pu) in the environment via complexation and reduction mechanisms. Hydroxamate siderophores have been specifically implicated due to their strong association with Pu. Hydroxamate siderophores can also break down into di and monohydroxamates and may influence the Pu oxidation state, and thereby its mobility. In this study we explored the reactions of Pu(VI) and Pu(V) with a monohydroxamate compound (acetohydroxamic acid, AHA) and a trihydroxamate siderophore desferrioxamine B (DFOB) at an environmentally relevant pH (5.5-8.2). Pu(VI) was instantaneously reduced to Pu(V) upon reaction with AHA. The presence of hydroxylamine was not observed at these pHs; however, AHA was consumed during the reaction. This suggests that the reduction of Pu(VI) to Pu(V) by AHA is facilitated by a direct one electron transfer. Importantly, further reduction to Pu(IV) or Pu(III) was not observed, even with excess AHA. We believe that further reduction of Pu(V) did not occur because Pu(V) does not form a strong complex with hydroxamate compounds at a circum-neutral pH. Experiments performed using desferrioxamine B (DFOB) yielded similar results. Broadly, this suggests that Pu(V) reduction to Pu(IV) in the presence of natural organic matter is not facilitated by hydroxamate functional groups and that other natural organic matter moieties likely play a more prominent role.
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Affiliation(s)
- Keith D Morrison
- Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, L-452 , Lawrence Livermore National Laboratory , Livermore , CA 94550 , United States
- Glenn T. Seaborg Institute, Physical and Life Sciences Directorate, L-231 , Lawrence Livermore National Laboratory , Livermore , CA 94550 , United States
| | - Yongqin Jiao
- Biosciences and Biotechnology Division, Physical and Life Sciences Directorate, L-452 , Lawrence Livermore National Laboratory , Livermore , CA 94550 , United States
| | - Annie B Kersting
- Director's Office, L-019 , Lawrence Livermore National Laboratory , Livermore , CA 94550 , United States
| | - Mavrik Zavarin
- Glenn T. Seaborg Institute, Physical and Life Sciences Directorate, L-231 , Lawrence Livermore National Laboratory , Livermore , CA 94550 , United States
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23
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Sillanpää M, Ncibi MC, Matilainen A, Vepsäläinen M. Removal of natural organic matter in drinking water treatment by coagulation: A comprehensive review. CHEMOSPHERE 2018; 190:54-71. [PMID: 28985537 DOI: 10.1016/j.chemosphere.2017.09.113] [Citation(s) in RCA: 245] [Impact Index Per Article: 40.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Revised: 09/19/2017] [Accepted: 09/24/2017] [Indexed: 06/07/2023]
Abstract
Natural organic matter (NOM) is a complex matrix of organic substances produced in (or channeled to) aquatic ecosystems via various biological, geological and hydrological cycles. Such variability is posing a serious challenge to most water treatment technologies, especially the ones designed to treat drinking water supplies. Lately, in addition to the fluctuating composition of NOM, a substantial increase of its concentration in fresh waters, and also municipal wastewater effluents, has been reported worldwide, which justifies the urgent need to develop highly efficient and versatile water treatment processes. Coagulation is among the most applied processes for water and wastewater treatment. The application of coagulation to remove NOM from drinking water supplies has received a great deal of attention from researchers around the world because it was efficient and helped avoiding the formation of disinfection by products (DBPs). Nonetheless, with the increased fluctuation of NOM in water (concentration and composition), the efficiency of conventional coagulation was substantially reduced, hence the need to develop enhanced coagulation processes by optimizing the operating conditions (mainly the amount coagulants and pH), developing more efficient inorganic or organic coagulants, as well as coupling coagulation with other water treatment technologies. In the present review, recent research studies dealing with the application of coagulation for NOM removal from drinking water supplies are presented and compared. In addition, integration schemes combining coagulation and other water treatment processes are presented, including membrane filtration, oxidation, adsorption and others processes.
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Affiliation(s)
- Mika Sillanpää
- Laboratory of Green Chemistry, School of Engineering Science, Lappeenranta University of Technology, Sammonkatu 12, 50130, Mikkeli, Finland; Department of Civil and Environmental Engineering, Florida International University, Miami FL, 33174, USA
| | - Mohamed Chaker Ncibi
- Laboratory of Green Chemistry, School of Engineering Science, Lappeenranta University of Technology, Sammonkatu 12, 50130, Mikkeli, Finland.
| | - Anu Matilainen
- Finnish Safety and Chemicals Agency, Kalevantie 2, 33100 Tampere, Finland
| | - Mikko Vepsäläinen
- CSIRO Mineral Resources Flagship, Box 312, Clayton South, VIC, 3169, Australia
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