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Al-Alam J, Harb M, Hage TG, Wazne M. Assessment of Opuntia ficus-indica (L.) Mill. extracts for the removal of lead from soil: the role of CAM plant harvest phase and soil properties. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:798-810. [PMID: 35906518 DOI: 10.1007/s11356-022-22194-7] [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: 01/04/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
Extensive research to date has focused on the coagulation-flocculation and biosorption properties of the invasive Opuntia ficus-indica (L.) Mill. to remove metals from water. However, no studies have reported on the use of O. ficus-indica extract as a leaching agent to remove metals from contaminated soil. In the present work, a new environmentally friendly method for lead-contaminated soil remediation is evaluated. The method involves the use of cladode extract from O. ficus-indica as a soil washing agent. This new technique can serve to mitigate against the potential deterioration of soil quality and other secondary environmental impacts that result from the use of inorganic acids and/or chelating agents. Extractions from cladodes harvested during both day and night crassulacean acidic metabolism (CAM) phases were evaluated for treatment of lead contamination in three different soils including kaolinite, montmorillonite and a field-natural soil sample. Lead removal rates, which ranged from 44 to 100%, were significantly impacted by the intrinsic properties of the soils, the leachate dosage, the plant harvest phase, and the soil washing duration. Fourier-transform infrared spectroscopy (FTIR) characterization of the leachates indicated that functional groups present in the O. ficus-indica extracts played an essential role in the removal process. Results suggest that this species possesses promising potential to be used as a sustainable basis for the abatement of lead contaminated soil.
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Affiliation(s)
- Josephine Al-Alam
- Civil Engineering Department, Lebanese American University, 309 Bassil Building, Byblos, Lebanon
| | - Moustapha Harb
- Civil Engineering Department, Lebanese American University, 309 Bassil Building, Byblos, Lebanon
| | - Tanos G Hage
- Faculty of Natural and Applied Sciences, Notre Dame University, P.O. Box 72, Zouk Mikael, Zouk Mosbeh, Lebanon
| | - Mahmoud Wazne
- Civil Engineering Department, Lebanese American University, 309 Bassil Building, Byblos, Lebanon.
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Yang S, Li Y, Si S, Liu G, Yun H, Tu C, Li L, Luo Y. Feasibility of a combined solubilization and eluent drainage system to remove Cd and Cu from agricultural soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 807:150733. [PMID: 34606870 DOI: 10.1016/j.scitotenv.2021.150733] [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: 07/12/2021] [Revised: 09/28/2021] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
Washing using low-molecular-weight organic acid is an effective and eco-friendly technique to permanently remove heavy metals from soil. There is still lack of evaluation of the application modes and the recovery methods, as well as the variations of heavy metal and nutrients fractions on a pilot-scale during washing. Here, we developed a simple combined solubilization and eluent drainage system in a pilot-scale washing box using industrial grade citric acid with feasible waste eluent treatment method to remove cadmium (Cd) and copper (Cu) from agricultural soil. The removal rates of Cd and Cu after sequential two-stage citric acid-water washing reach up 68.9% and Cu 41.4%, which was 7.5% and 10.0% higher than single citric acid. The removed the heavy metals were mainly in exchangeable and reducible fractions. The heavy metals at different soil depth were dissolved more effectively by citric acid-water washing with wheat straw as underdrain filling material than that of crushed stone. The potential risks of Cd in soils all decreased by approximately 75% from considerable to low risk. The two-stage citric acid-water washing significantly mitigated the effect of soil acidification. The average contents of soil organic matter, available ammonium N-NH4 and available phosphorus increased by 40.9%, 57.3%, 32.0% after citric acid-water washing under wheat straw filling. The waste eluent can be efficiently recovered by clam powder, which removed 78.7% of Cd and 57.5% of Cu. The regenerated citric acid showed similar removal efficiencies for Cd and Cu compared to the fresh citric acid. These results indicate that the combination of washing, drainage and flocculation can effectively remove Cd and Cu from contaminated agricultural soil and realize the recycling of waste eluent.
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Affiliation(s)
- Shuai Yang
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, PR China
| | - Yuan Li
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, PR China
| | - Shaocheng Si
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, PR China
| | - Guoming Liu
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences (CAS), Nanjing 210008, PR China
| | - Hao Yun
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, PR China
| | - Chen Tu
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, PR China
| | - Lianzhen Li
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, PR China
| | - Yongming Luo
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, PR China; CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences (CAS), Nanjing 210008, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China; Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai 264003, PR China.
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Kim S, Kim HB, Kwon EE, Baek K. Mitigating translocation of arsenic from rice field to soil pore solution by manipulating the redox conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 762:143124. [PMID: 33127142 DOI: 10.1016/j.scitotenv.2020.143124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 10/06/2020] [Accepted: 10/13/2020] [Indexed: 06/11/2023]
Abstract
Arsenic (As) is uptaken more readily by rice over wheat and barley. The exposure of As to humans being in the rice-consuming regions is a serious issue. Thus, an effective practice to reduce the translocation of As from soil to rice grain should be implemented. During a flooding period, the water layer greatly limits the transport of oxygen from atmosphere to soil, which provides favorable conditions for reduction of oxygen. The reduction of Fe in the soil during the flooding condition is closely related to the As mobility, which expedites the release of As to the soil pore solution and increases As uptake by rice plants. Therefore, the performance of oxygen releasing compounds (ORCs) was evaluated to lower the translocation of As from soil to soil solution. Specifically, in the simple system containing ORCs and water, the oxygen releasing capacity of ORCs was scrutinized. In addition, ORCs was applied to sea sand and arsenic bearing ferrihydrite to identify the contribution of ORCs to As and iron mobility. Especially, ORCs were introduced to the closed (completely mixed system) and open (static) systems to simulate the paddy soil environment. Introducing ORCs increased the DO in the aqueous phase, and CaO2 was more effective in increasing DO than MgO2. In the static system simulating a rice field, the dissolution of ORCs was inhibited. The pH increased due to the formation of hydroxide, but the increase was not significant in the soil due to the buffering capacity of the soil. Finally, the As concentration in the soil solution was lowered to 25-50% of that of the control system by application of ORCs in the static paddy soil system. All experimental findings signify that the application of ORCs can be an effective practice to lower the translocation of As from soil to pore solution.
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Affiliation(s)
- Seonhee Kim
- Department of Environmental Engineering and Soil Environment Research Center, Jeonbuk National University, Jeonju, Jeollabukdo 57896, Republic of Korea
| | - Hye-Bin Kim
- Department of Environmental Engineering and Soil Environment Research Center, Jeonbuk National University, Jeonju, Jeollabukdo 57896, Republic of Korea; Department of Environment & Energy and Soil Environment Research Center, Jeonbuk National University, Jeonju, Jeollabukdo 57896, Republic of Korea
| | - Eilhann E Kwon
- Department of Environment and Energy, Sejong University, Seoul 05005, Republic of Korea
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Jeonbuk National University, Jeonju, Jeollabukdo 57896, Republic of Korea; Department of Environment & Energy and Soil Environment Research Center, Jeonbuk National University, Jeonju, Jeollabukdo 57896, Republic of Korea.
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Ye J, Liao W, Zhang P, Li J, Nabi M, Wang S, Cai Y, Li F. Fe 1-xS/biochar combined with thiobacillus enhancing lead phytoavailability in contaminated soil: Preparation of biochar, enrichment of thiobacillus and their function on soil lead. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 267:115447. [PMID: 32866876 DOI: 10.1016/j.envpol.2020.115447] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 08/01/2020] [Accepted: 08/15/2020] [Indexed: 06/11/2023]
Abstract
Properly increasing mobility of heavy metals could promote phytoremediation of contaminated soil. Fe1-xS/biochar was successfully prepared from sawdust with loading pyrrhotite (Fe1-xS) at a pyrolysis temperature of 550 °C. Thiobacillus were successfully adsorbed and enriched on the surface of Fe1-xS/biochar. Microbial growth for 36 d supported by bio-oxidization of Fe1-xS decreased the system pH from 4.32 to 3.50, increased the ORP from 298 to 487 mV, and the Fe3+ release reached 25.48 mg/g, enhancing the oxidation and leaching of soil Pb. Finally, Fe1-xS/biochar and Thiobacillus were simultaneously applied into Pb-contaminated soil for 60 d, the soil pH decreased from 7.83 to 6.72, and the exchangeable fraction of soil Pb increased from 22.86% to 37.19%. Ryegrass planting for 60 d in Pb-contaminated soil with Fe1-xS/biochar and Thiobacillus showed that the Pb content in shoot and root of ryegrass increased by 55.65% and 73.43%, respectively, confirming an obvious increase of phytoavailability of soil Pb. The relative abundance of Thiobacillus in remediated soil significantly increased from 0.06% to 34.55% due to the addition of Fe1-xS/biochar and Thiobacillus. This study provides a novel approach for regulating the Pb phytoavailability for phytoremediation of Pb-contaminated soil.
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Affiliation(s)
- Junpei Ye
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
| | - Wenmin Liao
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
| | - Panyue Zhang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China.
| | - Juan Li
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
| | - Mohammad Nabi
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
| | - Siqi Wang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
| | - Yajing Cai
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
| | - Fan Li
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China
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Zhou Y, Liao C, Zhou Z, Chang C, Shih K. Effectively immobilizing lead through a melanotekite structure using low-temperature glass-ceramic sintering. Dalton Trans 2019; 48:3998-4006. [PMID: 30843567 DOI: 10.1039/c9dt00320g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work evaluated the feasibility of using low-temperature thermal immobilization based on the reaction mechanism forming the melanotekite (Pb2Fe2Si2O9) crystal phase to stabilize lead (Pb) containing waste. X-ray diffraction demonstrated that Pb could be incorporated into the melanotekite structure at easily attainable treatment temperatures (less than 500 °C) by magnetite and SiO2 precursors. The γ-Fe2O3 intermediate was found to play a key role in initializing melanotekite crystallization at a much lower temperature than that in traditional thermal immobilization techniques. Although a higher sintering temperature may increase Pb incorporation efficiency, amorphization occurred at temperatures higher than 950 °C. In addition, Pb was found to partition more in the amorphous phase of the SiO2-rich matrix. The results of the prolonged toxicity characteristic leaching procedure revealed a substantial improvement in the acid resistance of the targeted crystallized product sintered at 850 °C compared with the amorphous product and the other oxide products. The results of batch adsorption and subsequent thermal treatment verified the possibility of using the melanotekite structure to stabilize aqueous Pb with the Fe3O4@SiO2 residue. The study demonstrated that the melanotekite structure can be used to immobilize both solid and aqueous Pb through low-temperature thermal stabilization.
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Affiliation(s)
- Ying Zhou
- Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, HKSAR, China.
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Zou Q, Xiang H, Jiang J, Li D, Aihemaiti A, Yan F, Liu N. Vanadium and chromium-contaminated soil remediation using VFAs derived from food waste as soil washing agents: A case study. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 232:895-901. [PMID: 30530280 DOI: 10.1016/j.jenvman.2018.11.129] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 10/18/2018] [Accepted: 11/26/2018] [Indexed: 06/09/2023]
Abstract
Food waste (FW) is environmentally unfriendly and decays easily under ambient conditions. Vanadium (V) and chromium (Cr) contamination in soils has become an increasing concern due to risks to human health and environmental conservation. Volatile fatty acids (VFAs) derived from FW was applied as soil washing agent to treat V and Cr-contaminated soil collected from a former V smelter site in this work. The Community Bureau of Reference (BCR) three-step sequential extraction procedure was used to identify geochemical fractions of V and Cr influencing their mobility and biological toxicity. Optimal parameters of a single washing procedure were determined to be a 4 h contact time, liquid-solid ratio of 10:1, VFAs concentration of 30 g/L, and reaction temperature of 25 °C, considering for typical soil remediation projects and complete anaerobic fermentation of FW. Under the optimal conditions, butyric acid fermentation VFAs attained removal rates of 57.09 and 23.55% for extractable fractions of V and Cr, respectively. Simultaneously, a multi-washing process under a constant liquid-solid ratio using fresh and recycled VFAs was conducted, which led to an improvement on the total removal efficiency of toxic metals. The washing procedure could reach the pollution thresholds for several plants, such as of S. viridis, K. scoparia, M. sativa, and E. indica. This strategy enhances the utilization of VFAs derived from food waste, has a positive effect on V and Cr-contaminated soil remediation, wastewater control of soil washing and FW disposal.
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Affiliation(s)
- Quan Zou
- School of Environment, Tsinghua University, Beijing 10084, China.
| | - Honglin Xiang
- School of Environment, Tsinghua University, Beijing 10084, China
| | - Jianguo Jiang
- School of Environment, Tsinghua University, Beijing 10084, China; Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education, Beijing 10084, China.
| | - Dean Li
- School of Environment, Tsinghua University, Beijing 10084, China
| | | | - Feng Yan
- School of Environment, Tsinghua University, Beijing 10084, China
| | - Nuo Liu
- School of Environment, Tsinghua University, Beijing 10084, China
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Hettiarachchi E, Paul S, Cadol D, Frey B, Rubasinghege G. Mineralogy Controlled Dissolution of Uranium from Airborne Dust in Simulated Lung Fluids (SLFs) and Possible Health Implications. ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS 2019; 6:62-67. [PMID: 30775400 PMCID: PMC6372124 DOI: 10.1021/acs.estlett.8b00557] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The recent increase in cardiovascular and metabolic disease in the Navajo population residing close to the Grants Mining District (GMD) in New Mexico is suggested to be due to exposure to environmental contaminants, in particular uranium in respirable dusts. However, the chemistry of uranium-containing-dust dissolution in lung fluids and the role of mineralogy are poorly understood, as is their impact on toxic effects. The current study is focused on the dissolution of xcontaining-dust, collected from several sites near Jackpile and St. Anthony mines in the GMD, in two simulated lung fluids (SLFs): Gamble's solution (GS) and Artificial Lysosomal Fluid (ALF). We observe that the respirable dust includes uranium minerals that yield the uranyl cation, UO2 2+, as the primary dissolved species in these fluids. Dust rich in uraninite and carnotite is more soluble in GS, which mimics interstitial conditions of the lungs. In contrast, dust with low uraninite and high kaolinite is more soluble in ALF, which simulates the alveolar macrophage environment during phagocytosis. Moreover, geochemical modeling, performed using PHREEQC, is in good agreement with our experimental results. Thus, the current study highlights the importance of site-specific toxicological assessments across mining districts with the focus on their mineralogical differences.
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Affiliation(s)
- Eshani Hettiarachchi
- Department of Chemistry, New Mexico Tech, 801 Leroy Place, Socorro, New Mexico 87801, United States
| | - Shaylene Paul
- Department of Environmental Science, Navajo Technical University, Lowerpoint Road, Crownpoint, New Mexico 87313, United States
| | - Daniel Cadol
- Department of Earth and Environmental Science, New Mexico Tech, 801 LeRoy Pl, Socorro, New Mexico 87801, United States
| | - Bonnie Frey
- New Mexico Bureau of Geology, New Mexico Tech, 801 LeRoy Pl, Socorro, New Mexico 87801, United States
| | - Gayan Rubasinghege
- Department of Chemistry, New Mexico Tech, 801 Leroy Place, Socorro, New Mexico 87801, United States
- Corresponding Author: G. Rubasinghege. .
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Yoo J, Jeon P, Tsang DCW, Kwon EE, Baek K. Ferric-enhanced chemical remediation of dredged marine sediment contaminated by metals and petroleum hydrocarbons. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 243:87-93. [PMID: 30172127 DOI: 10.1016/j.envpol.2018.08.044] [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: 03/15/2018] [Revised: 07/21/2018] [Accepted: 08/16/2018] [Indexed: 06/08/2023]
Abstract
Sediments nearby harbors are dredged regularly, and the sediments require the stringent treatment to meet the regulations on reuse and mitigate the environmental burdens from toxic pollutants. In this study, FeCl3 was chosen as an extraction agent to treat marine sediment co-contaminated with Cu, Zn, and total petroleum hydrocarbons (TPH). In chemical extraction process, the extraction efficiency of Cu and Zn by FeCl3 was compared with the conventional one using inorganic acids (H2SO4 and HCl). Despite the satisfactory level for extraction of Cu (78.8%) and Zn (73.3%) by HCl (0.5 M) through proton-enhanced dissolution, one critical demerit, particularly acidified sediment, led to the unwanted loss of Al, Fe, and Mg by dissolution. Moreover, the vast amount of HCl required the huge amounts of neutralizing agents for the post-treatment of the sediment sample via the washing process. Despite a low concentration, extraction of Cu (70.1%) and Zn (69.4%) was done by using FeCl3 (0.05 M) through proton-enhanced dissolution, ferric-organic matter complexation, and oxidative dissolution of sulfide minerals. Ferric iron (Fe3+) was reduced to ferrous iron (Fe2+) with sulfide (S2-) oxidation during FeCl3 extraction. In consecutive chemical oxidations using hydrogen peroxide (H2O2) and persulfate (S2O82-), the resultant ferrous iron was used to activate the oxidants to effectively degrade TPH. S2O82- using FeCl3 solution (molar ratio of ferrous to S2O82- is 19.8-198.3) removed 42.6% of TPH, which was higher than that by H2O2 (molar ratio of ferrous to H2O2 is 1.2-6.1). All experimental findings suggest that ferric is effectively accommodated to an acid washing step for co-contaminated marine sediments, which leads to enhanced extraction, cost-effectiveness, and less environmental burden.
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Affiliation(s)
- Jongchan Yoo
- Center for Carbon Mineralization, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124, Gwahak-ro, Yuseong-gu, Daejeon, 34132, Republic of Korea
| | - Pilyong Jeon
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do, 54896, Republic of Korea
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Eilhann E Kwon
- Department of Environment and Energy, Sejong University, Seoul, 05006, Republic of Korea
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do, 54896, Republic of Korea.
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Guo J, Li Y, Hu C, Zhou S, Xu H, Zhang Q, Wang G. Ca-containing amendments to reduce the absorption and translocation of Pb in rice plants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 637-638:971-979. [PMID: 29763878 DOI: 10.1016/j.scitotenv.2018.05.100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 03/30/2018] [Accepted: 05/08/2018] [Indexed: 06/08/2023]
Abstract
The influence of three Ca-containing amendments (dolomite, slaked lime, and limestone) on soil water soluble Pb (Pb-w) levels, Pb accumulation by two rice plants (TJ-8, japonica and II-3301, indica), and the factors affecting Pb-w were investigated. Pot experiment was performed under waterlogged conditions using Pb-contaminated soil collected from an agricultural field near a mine. It was found that the soil amendments significantly reduced Pb content in the rice plants in the order dolomite > slaked lime > limestone, irrespective of rice cultivar. The Pb content of brown rice with the added soil amendments was lower than that of the recommended limit (0.2 mg kg-1, GB2762-2017) except for cultivar II-3301 with slaked lime. There was a significant positive correlation between the Pb content of the roots, stems, leaves, and grains and the soil Pb-w levels. The amendments reduced soil Eh, Fe, and Mn concentrations in the pore water and increased soil pH. The total organic carbon (TOC) in the pore water significantly decreased for II-3301 but not for TJ-8 at the ripening stage after addition of the amendments. Among soil Eh, pH, TOC, Fe, and Mn in the pore water, Fe and Mn were the most influential in lowering soil Pb-w levels. The amendments inhibited the formation of iron plaques on the root surface and reduced Pb adsorption. The Pb content of the roots was positively correlated with that in iron plaque. These findings are significant as they imply that the application of Ca-containing amendments in Pb-contaminated paddy soils near mines is an effective approach for in situ immobilization of Pb and reduction in Pb levels in the edible parts of crops.
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Affiliation(s)
- Jingxia Guo
- College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Yunyun Li
- College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Cong Hu
- College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Shi Zhou
- College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Hao Xu
- College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Qijia Zhang
- College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China
| | - Guo Wang
- College of Resource and Environmental Science, Soil Environmental Health and Regulation, Key Laboratory of Fujian Province, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China.
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Lee ME, Jeon EK, Tsang DCW, Baek K. Simultaneous application of oxalic acid and dithionite for enhanced extraction of arsenic bound to amorphous and crystalline iron oxides. JOURNAL OF HAZARDOUS MATERIALS 2018; 354:91-98. [PMID: 29729603 DOI: 10.1016/j.jhazmat.2018.04.083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 04/18/2018] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
To extract As bound to amorphous and crystalline iron oxides, this study proposed simultaneous application of oxalic acid and dithionite, which was observed to induce synergistic effect and accomplish effective extraction of As bound to both iron oxides. However, the formation of arsenic sulfide decreased overall removal of As because the insoluble precipitate form of As remained as a residual fraction of As in soil. Therefore, stepwise addition of dithionite in the simultaneous application was applied to minimize the formation of secondary minerals and maximize the As extraction. As a result, 74% of As bound to amorphous iron oxides and 65% of As bound to crystalline iron oxides were removed. More importantly, the stepwise application of oxalic acid and dithionite was effective to reduce the bioaccessible concentration of As in the treated soil. Therefore, the proposed application could reduce the potential risk of contaminated soil to human health by extraction-based remedial action.
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Affiliation(s)
- Myeong Eun Lee
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 561-756, Republic of Korea
| | - Eun-Ki Jeon
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 561-756, Republic of Korea
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong, China
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo, 561-756, Republic of Korea.
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11
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Adsorption characteristics of arsenic and phosphate onto iron impregnated biochar derived from anaerobic granular sludge. KOREAN J CHEM ENG 2018. [DOI: 10.1007/s11814-018-0057-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yoo JC, Beiyuan J, Wang L, Tsang DCW, Baek K, Bolan NS, Ok YS, Li XD. A combination of ferric nitrate/EDDS-enhanced washing and sludge-derived biochar stabilization of metal-contaminated soils. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 616-617:572-582. [PMID: 29128124 DOI: 10.1016/j.scitotenv.2017.10.310] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 10/10/2017] [Accepted: 10/30/2017] [Indexed: 06/07/2023]
Abstract
In this study, soil washing and stabilization as a two-step soil remediation strategy was performed to remediate Pb- and Cu-contaminated soils from shooting range and railway sites. Ferric nitrate (Fe(NO3)3) and [S,S]-ethylenediamine disuccinate (EDDS) were used as washing agents, whereas three types of sludge-derived biochars and phosphogypsum were employed as soil stabilizers. While Fe(NO3)3 extracted larger amounts of metals compared to EDDS (84% Pb and 64% Cu from shooting range soil; 30% Pb and 40% Cu from railway site soil), it caused severe soil acidification. Both Fe(NO3)3 and EDDS washing enhanced the mobility of residual metals in the two soils, which in most cases could be mitigated by subsequent 2-month stabilization by sludge-derived biochars or phosphogypsum. By contrast, the metal bioaccessibility could only be reduced by soil washing. Nutrient-rich sludge-derived biochar replenished available P and K in both soils, whereas Fe(NO3)3 washing provided available nitrogen (N). Soil amendment enhanced acid phosphatase activity but marginally improved soil dehydrogenase and urease activity in the treated soils, possibly due to the influence of residual metals. This study supported the integration of soil washing (by Fe(NO3)3 or EDDS) with soil stabilization (by sludge-derived biochars or phosphogypsum) for accomplishing the reduction of metal mobility and bioaccessibility, while restoring the environmental quality of the treated soils.
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Affiliation(s)
- Jong-Chan Yoo
- Mineral Processing Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124, Gwahak-ro, Yuseong-gu, Daejeon 34132, Republic of Korea; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Jingzi Beiyuan
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Centre of Sustainable Design and Environment, Faculty of Design and Environment, Technological and Higher Education Institute of Hong Kong, Hong Kong, China
| | - Lei Wang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
| | - Kitae Baek
- Department of Environmental Engineering and Soil Environment Research Center, Chonbuk National University, Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do 54896, Republic of Korea; Department of Bioactive Material Sciences, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do 54896, Republic of Korea.
| | - Nanthi S Bolan
- Global Centre for Environmental Remediation (GCER), Faculty of Science and Information Technology, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Yong Sik Ok
- O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Xiang-Dong Li
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
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