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https://www.readbyqxmd.com/read/28918290/in-situ-arsenic-oxidation-and-sorption-by-a-fe-mn-binary-oxide-waste-in-soil
#1
Clare M McCann, Caroline L Peacock, Karen A Hudson-Edwards, Thomas Shrimpton, Neil D Gray, Karen L Johnson
The ability of a Fe-Mn binary oxide waste to adsorb arsenic (As) in a historically contaminated soil was investigated. Initial laboratory sorption experiments indicated that arsenite [As(III)] was oxidized to arsenate [As(V)] by the Mn oxide component, with concurrent As(V) sorption to the Fe oxide. The binary oxide waste had As(III) and As(V) adsorption capacities of 70mgg(-1) and 32mgg(-1) respectively. X-ray Absorption Near-Edge Structure and Extended X-ray Absorption Fine Structure at the As K-edge confirmed that all binary oxide waste surface complexes were As(V) sorbed by mononuclear bidentate corner-sharing, with 2 Fe at ∼3...
September 14, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28918247/erato-polymnioides-a-novel-hg-hyperaccumulator-plant-in-ecuadorian-rainforest-acid-soils-with-potential-of-microbe-associated-phytoremediation
#2
Irene Chamba, Daniel Rosado, Carolina Kalinhoff, Selvaraj Thangaswamy, Aminael Sánchez-Rodríguez, Manuel Jesús Gazquez
Mercury (Hg) accumulation capacity was assessed in three plant species (Axonopus compressus, Erato polymnioides, and Miconia zamorensis) that grow on soils polluted by artisanal small-scale gold mines in the Ecuadorian rainforest. Individuals of three species were collected at two sampling zones: i) an intensive zone (IZ, 4.8 mg Hg kg(-1) of soil) where gold extraction continues to occur, and ii) a natural zone (NZ, 0.19 mg Hg kg(-1) of soil). In addition, the percentage of arbuscular mycorrhizal fungi (AMF) colonization was determined in plant roots and seven fungal morphotypes isolated from rhizospheric soil...
August 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/28915454/assessing-the-potential-contributions-of-additional-retention-processes-to-pfas-retardation-in-the-subsurface
#3
Mark L Brusseau
A comprehensive understanding of the transport and fate of per- and poly-fluoroalkyl substances (PFAS) in the subsurface is critical for accurate risk assessments and design of effective remedial actions. A multi-process retention model is proposed to account for potential additional sources of retardation for PFAS transport in source zones. These include partitioning to the soil atmosphere, adsorption at air-water interfaces, partitioning to trapped organic liquids (NAPL), and adsorption at NAPL-water interfaces...
September 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28914413/study-of-the-mechanism-of-remediation-of-cd-contaminated-soil-by-novel-biochars
#4
Zhongxin Tan, Yuanhang Wang, Limei Zhang, Qiaoyun Huang
This article used novel non-magnetized and magnetized biochars prepared under a CO2 atmosphere returned to Cd-contaminated soil and compared these to the effects of conventional biochars prepared under a N2 atmosphere with regard to Cd-contaminated soil remediation. A pot experiment with lettuce (Lactuca sativa) was conducted to investigate the relative soil remediation effects of these biochars. The soil used for the pot experiment was spiked with 20 mg kg(-1) Cd and amended with 5% of a biochar before sowing...
September 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28914181/remediation-approach-for-organic-compounds-and-arsenic-co-contaminated-soil-using-pressurized-hot-water-extraction-process
#5
Mohammad Nazrul Islam, Young-Tae Jo, Yeon-Jae Jeong, Jeong-Hun Park
Successful remediation of soil with co-existing organics contaminants and arsenic (As) is a challenge as the chemical and remediation technologies are different for each group of pollutants. In this study, the treatment effectiveness of pressurized hot water (PHW) extraction process was investigated for remediation of soil co-contaminated with phenol, crude oil, polycyclic aromatic hydrocarbons (PAHs) and As. An elimination percentage of about 99% was achieved for phenol, and in the range of 63-100% was observed for the PAHs at 260 °C for 90 min operation...
September 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28913724/use-of-phytoproductivity-data-in-the-choice-of-native-plant-species-to-restore-a-degraded-coal-mining-site-amended-with-a-stabilized-industrial-organic-sludge
#6
Claudete G Chiochetta, Hela Toumi, Renata F S Böhm, Fernanda Engel, Gabriel Poyer-Radetski, Leonardo R Rörig, Fabrizio Adani, Claudemir M Radetski
Coal mining-related activities result in a degraded landscape and sites associated with large amounts of dumped waste material. The arid soil resulting from acid mine drainage affects terrestrial and aquatic ecosystems, and thus, site remediation programs must be implemented to mitigate this sequential deleterious processes. A low-cost alternative material to counterbalance the affected physico-chemical-microbiological aspects of the degraded soil is the amendment with low contaminated and stabilized industrial organic sludge...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28910736/soil-microbial-community-responses-to-acid-exposure-and-neutralization-treatment
#7
Doyun Shin, Yunho Lee, Jeonghyun Park, Hee Sun Moon, Sung Pil Hyun
Changes in microbial community induced by acid shock were studied in the context of potential release of acids to the environment due to chemical accidents. The responses of microbial communities in three different soils to the exposure to sulfuric or hydrofluoric acid and to the subsequent neutralization treatment were investigated as functions of acid concentration and exposure time by using 16S-rRNA gene based pyrosequencing and DGGE (Denaturing Gradient Gel Electrophoresis). Measurements of soil pH and dissolved ion concentrations revealed that the added acids were neutralized to different degrees, depending on the mineral composition and soil texture...
September 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28903604/remediation-of-contaminated-soils-by-biotechnology-with-nanomaterials-bio-behavior-applications-and-perspectives
#8
Xiaomin Gong, Danlian Huang, Yunguo Liu, Zhiwei Peng, Guangming Zeng, Piao Xu, Min Cheng, Rongzhong Wang, Jia Wan
Soil contamination caused by heavy metals and organic pollutants has drawn world-wide concern. Biotechnology has been applied for many years to the decontamination of soils polluted with organic and inorganic contaminants, and novel nanomaterials (NMs) has attracted much concern due to their high capacity for the removal/stabilization/degradation of pollutants. Recently, developing advanced biotechnology with NMs for the remediation of contaminated soils has become a hot research topic. Some researchers found that bioremediation efficiency of contaminated soils was enhanced by the addition of NMs, while others demonstrated that the toxicity of NMs to the organism negatively influenced the repair capacity of polluted soils...
September 13, 2017: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/28903175/chelant-enhanced-washing-of-cca-contaminated-soil-coupled-with-selective-dissolution-or-soil-stabilization
#9
Jingzi Beiyuan, Abbe Y T Lau, Daniel C W Tsang, Weihua Zhang, Chih-Ming Kao, Kitae Baek, Yong Sik Ok, Xiang-Dong Li
Remediation of CCA-contaminated soil (Cr, Cu, and As) by biodegradable chelant-enhanced washing (EDDS, S,S-ethylene-diamine-disuccinic-acid) needs further enhancement. This study investigated the effectiveness of coupling with pre-treatment by selective dissolution and post-treatment by soil amendments, respectively. Three groups of reagents (reductants, alkaline solvents, and organic ligands) were adopted in the pre-treatment to dissolve the oxide minerals before EDDS extraction. In the post-treatment, soil amendments (coal fly ash (CFA), acid mine drainage sludge (AMDS), green waste compost (GWC)), and their mixtures) were used for a 2-month stabilization after 2-h EDDS washing...
September 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28898750/assessment-of-the-effectiveness-of-onsite-exsitu-remediation-by-enhanced-natural-attenuation-in-the-niger-delta-region-nigeria
#10
Reuben N Okparanma, Ikeabiama Azuazu, Josiah M Ayotamuno
This study was conducted to quantify and rank the effectiveness of onsite exsitu remediation by enhanced natural attenuation using soil quality index. The investigation was conducted at three oil spill sites in the Niger Delta (5.317°N, 6.467°E), Nigeria with a predominance of Oxisols. Baseline assessment and a two-step post-remediation monitoring of the sites were conducted. Target contaminants including total petroleum hydrocarbon (TPH) and BTEX (benzene, toluene, ethylbenzene, and xylene) were analyzed by gas chromatography-mass spectrometry...
September 9, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28895357/-bioremediation-of-oil-contaminated-field-by-two-pseudomonas-aeruginosa-strains
#11
Lei Huang, Tingting Zhao, Yun He, Yilin Liu, Chang Liu, Dayao Jin, Xiaoqiang Jia
We studied the remediation of petroleum-contaminated soils. Two Pseudomonas aeruginosa strains were screened from soil samples in the mine environment. The degradation rate of crude oil was 95.67% after 10 days by mixed culture of the two strains, which was 32% higher than that of single bacterium. It means that the two bacteria had synergistic effect on degrading crude oil. Based on the result, bacterial agent was prepared, and the oil pollution sites were artificially constructed to simulate the degradation of crude oil under different operating conditions...
June 25, 2017: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
https://www.readbyqxmd.com/read/28895025/leaching-variations-of-heavy-metals-in-chelator-assisted-phytoextraction-by-zea-mays-l-exposed-to-acid-rainfall
#12
Yayin Lu, Dinggui Luo, Lirong Liu, Zicong Tan, An Lai, Guowei Liu, Junhui Li, Jianyou Long, Xuexia Huang, Yongheng Chen
Chelant-enhanced phytoextraction method has been put forward as an effective soil remediation method, whereas the heavy metal leaching could not be ignored. In this study, a cropping-leaching experiment, using soil columns, was applied to study the metal leaching variations during assisted phytoextraction of Cd- and Pb-polluted soils, using seedlings of Zea mays, applying three different chelators (EDTA, EDDS, and rhamnolipid), and artificial rainfall (acid rainfall or normal rainfall). It showed that artificial rainfall, especially artificial acid rain, after chelator application led to the increase of heavy metals in the leaching solution...
September 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28895014/the-responses-of-two-native-plant-species-to-soil-petroleum-contamination-in-the-yellow-river-delta-china
#13
Wenjun Xie, Yanpeng Zhang, Rui Li, Hongjun Yang, Tao Wu, Liping Zhao, Zhaohua Lu
Petroleum contamination is a significant environmental problem in the Yellow River Delta. The responses of two native salt-tolerant plant species, alfalfa (Medicago sativa) and bristle grass (Setaria uiridis Beauv), to soil petroleum contamination were investigated at five levels between 0 and 2.0% (w/w). Results showed that the total, aboveground and underground plant biomasses of both species were significantly reduced by petroleum contamination (p < 0.05), with the inhibition enhanced with increased petroleum levels...
September 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28894252/bof-steel-slag-as-a-low-cost-sorbent-for-vanadium-v-removal-from-soil-washing-effluent
#14
Yuchen Gao, Jianguo Jiang, Sicong Tian, Kaimin Li, Feng Yan, Nuo Liu, Meng Yang, Xuejing Chen
Soil washing is an effective remediation method to remove heavy metals from contaminated soil. However, it produces wastewater that contains large amounts of heavy metals, which lead to serious pollution. This study investigated the removal of vanadium (V) from synthetic soil washing effluent using BOF steel slag. The effects of particle size, slag dosage, initial pH, and initial vanadium concentration on removal behavior were studied. Adsorption kinetics and isotherms were also analyzed. The results showed that the vanadium removal efficiency increased as the steel slag particle size decreased and as the amount of slag increased...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28893452/assessing-the-use-of-composts-from-multiple-sources-based-on-the-characteristics-of-carbon-mineralization-in-soil
#15
Xu Zhang, Yue Zhao, Longji Zhu, Hongyang Cui, Liming Jia, Xinyu Xie, Jiming Li, Zimin Wei
In order to improve soil quality, reduce wastes and mitigate climate change, it is necessary to understand the balance between soil organic carbon (SOC) accumulation and depletion under different organic waste compost amended soils. The effects of proportion (5%, 15%, 30%), compost type (sewage sludge (SS), tomato stem waste (TSW), municipal solid waste (MSW), kitchen waste (KW), cabbage waste (CW), peat (P), chicken manure (CM), dairy cattle manure (DCM)) and the black soil (CK). Their initial biochemical composition (carbon, nitrogen, C:N ratio) on carbon (C) mineralization in soil amended compost have been investigated...
September 8, 2017: Waste Management
https://www.readbyqxmd.com/read/28892859/assessment-of-flushing-methods-for-the-removal-of-heavy-chlorinated-compounds-dnapl-in-an-alluvial-aquifer
#16
Julien Maire, Antoine Joubert, Delphine Kaifas, Thomas Invernizzi, Julien Marduel, Stéfan Colombano, David Cazaux, Cédric Marion, Pierre-Yves Klein, Alain Dumestre, Nicolas Fatin-Rouge
Immiscible mobilization and foam flushing were assessed as low surfactant consuming technologies, for the enhanced recovery of dense non-aqueous phase liquid (DNAPL) residual at a site contaminated by heavy chlorinated compounds. Preliminary experiments in well-controlled conditions demonstrated the phenomena involved in these remediation technologies and their limitations. Furthermore, we characterized the technologies according to by their surfactant consumption (per kg of DNAPL recovered) and the final DNAPL saturation reached...
September 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28888941/application-of-the-ieubk-model-for-linking-children-s-blood-lead-with-environmental-exposure-in-a-mining-site-south-china
#17
Xin-Ying Zhang, David O Carpenter, Yong-Jin Song, Ping Chen, Yaoming Qin, Ni-Yu Wei, Shan-Chun Lin
This study consisted of a site- and age-specific investigation linking children's blood lead level (BLL) to environmental exposures in a historic mining site in south China. A total of 151 children, aged 3-7 years, were included in this study. The geometric mean (GM) BLL was 8.22 μg/dl, indicating an elevated BLL. The Integrated Exposure Uptake Bio-Kinetic (IEUBK) model has proven useful at many sites for study of routes of exposure. Application of the IEUBK model to these children indicated that the GM difference between observed and predicted BLL levels was only 1...
September 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28886542/enhanced-bioremediation-of-nutrient-amended-petroleum-hydrocarbon-contaminated-soils-over-a-cold-climate-winter-the-rate-and-extent-of-hydrocarbon-biodegradation-and-microbial-response-in-a-pilot-scale-biopile-subjected-to-natural-seasonal-freeze-thaw-temperatures
#18
Jihun Kim, Aslan Hwanhwi Lee, Wonjae Chang
A pilot-scale biopile field experiment for nutrient-amended petroleum-contaminated fine-grained soils was performed over the winter at a cold-climate site. The rate and extent of hydrocarbon biodegradation and microbial responses were determined and corresponded to the on-site soil phase changes (from unfrozen to partially frozen, deeply frozen, and thawed) associated with natural seasonal freeze-thaw conditions. Treated and untreated biopiles were constructed (~3500kg each) on an open outdoor surface at a remediation facility in Saskatoon, Canada...
September 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28881326/remediation-of-electronic-waste-polluted-soil-using-a-combination-of-persulfate-oxidation-and-chemical-washing
#19
Fu Chen, Zhanbin Luo, Gangjun Liu, Yongjun Yang, Shaoliang Zhang, Jing Ma
Laboratory experiments were conducted to investigate the efficiency of a simultaneous chemical extraction and oxidation for removing persistent organic pollutants (POPs) and toxic metals from an actual soil polluted by the recycling activity of electronic waste. Various chemicals, including hydroxypropyl-β-cyclodextrin (HPCD), citric acid (CA) and sodium persulfate (SP) were applied synchronously with Fe(2+) activated oxidation to enhance the co-removal of both types of pollutants. It is found that the addition of HPCD can enhance POPs removal through solubilization of POPs and iron chelation; while the CA-chelated Fe(2+) activation process is effective for extracting metals and degrading residual POPs...
September 4, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28881242/comparison-of-three-types-of-oil-crop-rotation-systems-for-effective-use-and-remediation-of-heavy-metal-contaminated-agricultural-soil
#20
Yang Yang, Xihong Zhou, Boqing Tie, Liang Peng, Hongliang Li, Kelin Wang, Qingru Zeng
Selecting suitable plants tolerant to heavy metals and producing products of economic value may be a key factor in promoting the practical application of phytoremediation polluted soils. The aim of this study is to further understand the utilization and remediation of seriously contaminated agricultural soil. In a one-year field experiment, we grew oilseed rape over the winter and then subsequently sunflowers, peanuts and sesame after the first harvest. This three rotation system produced high yields of dry biomass; the oilseed rape-sunflower, oilseed rape-peanut and oilseed rape-sesame rotation allowed us to extract 458...
August 29, 2017: Chemosphere
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