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https://www.readbyqxmd.com/read/28531917/assessing-phytotoxicity-of-trace-element-contaminated-soils-phytomanaged-with-gentle-remediation-options-at-ten-european-field-trials
#1
Celestino Quintela-Sabarís, Lilian Marchand, Petra S Kidd, Wolfgang Friesl-Hanl, Markus Puschenreiter, Jurate Kumpiene, Ingo Müller, Silke Neu, Jolien Janssen, Jaco Vangronsveld, Ioannis Dimitriou, Grzegorz Siebielec, Rafał Gałązka, Valérie Bert, Rolf Herzig, Andrew B Cundy, Nadège Oustrière, Aliaksandr Kolbas, William Galland, Michel Mench
Gentle remediation options (GRO), i.e. in situ stabilisation, (aided) phytoextraction and (aided) phytostabilisation, were implemented at ten European sites contaminated with trace elements (TE) from various anthropogenic sources: mining, atmospheric fallout, landfill leachates, wood preservatives, dredged-sediments, and dumped wastes. To assess the performance of the GRO options, topsoil was collected from each field trial, potted, and cultivated with lettuce (Lactuca sativa L.) for 48days. Shoot dry weight (DW) yield, photosynthesis efficiency and major element and TE concentrations in the soil pore water and lettuce shoots were measured...
May 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28531837/possible-developments-for-ex-situ-phytoremediation-of-contaminated-sediments-in-tropical-and-subtropical-regions-review
#2
REVIEW
Marco Pittarello, Jader Galba Busato, Paolo Carletti, Leonardo Barros Dobbss
The growing problem of remediation of contaminated sediments dredged from harbor channels needs to be resolved by a cost effective and sustainable technology. Phytoremediation, by ex situ remediation plants, seems to have the potential to replace traditional methods in case of moderately contaminated sediments. On the other side, the need to mix sediments with soil and/or sand to allow an easier establishment of most employed species causes an increase of the volume of the processed substrate up to 30%. Moreover the majority of phytoremediating species are natives of temperate climate belt...
April 22, 2017: Chemosphere
https://www.readbyqxmd.com/read/28528654/natural-radionuclides-and-stable-elements-in-weaver-ants-oecophylla-smaragdina-from-tropical-northern-australia
#3
Peter Medley, Che Doering, Fiona Evans, Andreas Bollhöfer
Natural radionuclides and stable elements were measured in weaver ants, leaves and soils collected from three sites in tropical northern Australia. Radionuclide concentration ratios for ants relative to soil were derived from the measurements and used to refine the current environmental radiological assessment for remediation of Ranger uranium mine. Use of site-specific concentration ratios for weaver ants gave a more conservative estimate of environmental exposure to the arthropod wildlife group than use of default concentration ratios in the ERICA Tool...
May 18, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28528500/using-poly-glutamic-acid-as-soil-washing-agent-to-remediate-heavy-metal-contaminated-soils
#4
Zong-Han Yang, Cheng-Di Dong, Chiu-Wen Chen, Yih-Terng Sheu, Chih-Ming Kao
The extraction efficiency of heavy metals from soils using three forms of gamma poly-glutamic acid (γ-PGA) as the washing agents was investigated. Controlling factors including agent concentrations, extraction time, pH, and liquid to soil ratio were evaluated to determine the optimum operational conditions. The distribution of heavy metal species in soils before and after extraction processes was analyzed. Up to 46 and 74% of heavy metal removal efficiencies were achieved with one round and a sequential extraction process using H-bonding form of γ-PGA (200 mM) with washing time of 40 min, liquid to solid ratio of 10 to 1, and pH of 6...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28526789/a-novel-iron-dependent-enzyme-that-catalyzes-the-initial-step-in-the-biodegradation-of-n-nitroglycine-by-variovorax-sp-strain-js1663
#5
Kristina M Mahan, Hangping Zheng, Tekle T Fida, Ronald J Parry, David E Graham, Jim C Spain
Nitramines are key constituents of most of the explosives in current use and consequently contaminate soil and groundwater at many military facilities around the world. Toxicity from nitramine contamination poses a health risk to plants and animals, thus understanding how nitramines are biodegraded is critical to environmental remediation. The biodegradation of synthetic nitramine compounds such as hexahydro-1,3,5-trinitro-1,3,5- triazine (RDX) has been studied for decades, but little is known about the catabolism of naturally produced nitramine compounds...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28525879/application-of-calcium-peroxide-in-water-and-soil-treatment-a-review
#6
REVIEW
Shuguang Lu, Xiang Zhang, Yunfei Xue
Calcium peroxide (CP) has been progressively applied in terms of environmental protection due to its certain physical and chemical properties. This review focuses on the latest progresses in the applications of CP in water and soil treatment, including wastewater treatment, surface water restoration and groundwater and soil remediation. The stability of CP makes it an effective solid phase to supply H2O2 and O2 for aerobic biodegradation and chemical degradation of contaminants in water and soil. CP has exerted great performance in the removal of dyes, chlorinated hydrocarbons, petroleum hydrocarbons, pesticides, heavy metals and various other contaminants...
May 4, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28521168/ecotoxicity-testing-and-environmental-risk-assessment-of-iron-nanomaterials-for-sub-surface-remediation-recommendations-from-the-fp7-project-nanorem
#7
Rune Hjorth, Claire Coutris, Nhung H A Nguyen, Alena Sevcu, Juliàn Alberto Gallego-Urrea, Anders Baun, Erik J Joner
Nanoremediation with iron (Fe) nanomaterials opens new doors for treating contaminated soil and groundwater, but is also accompanied by new potential risks as large quantities of engineered nanomaterials are introduced into the environment. In this study, we have assessed the ecotoxicity of four engineered Fe nanomaterials, specifically, Nano-Goethite, Trap-Ox Fe-zeolites, Carbo-Iron(®) and FerMEG12, developed within the European FP7 project NanoRem for sub-surface remediation towards a test battery consisting of eight ecotoxicity tests on bacteria (V...
May 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28511089/a-computational-assessment-of-representative-sampling-of-soil-gas-using-existing-groundwater-monitoring-wells-screened-across-the-water-table
#8
Kaveh Sookhak Lari, John L Rayner, Greg B Davis
Representative sampling is of great importance to decision making regarding contaminant site risks and remedial effectiveness. A focus here is whether existing groundwater monitoring wells screened across the water table can be sampled to yield representative indicators of soil gas composition. For the first time, we provide multi-phase, multi-component computational simulations to address this. We simulated high and low gas extractions rate strategies to sample the gas phase over short and extended screening intervals across the water table...
April 17, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28509939/bioremoval-of-lead-using-pennisetum-purpureum-augmented-with-enterobacter-cloacae-vitpasj1-a-pot-culture-approach
#9
Anamika Das, Priyanka Belgaonkar, Aditya S Raman, Sofia Banu, Jabez W Osborne
Lead is a toxic heavy metal discharged into the ecosystem from various industries. Biological remediation strategies have been effective in the bioremoval of lead. In our current study, a phytobacterial system using Pennisetum purpureum along with lead-resistant bacterium (LRB) was employed for the uptake of lead. The LRB was obtained from lead-contaminated sites. The isolate VITPASJ1 was found to be highly tolerant to lead and was identified as an effective plant growth-promoting bacterium. The 16S rRNA sequencing revealed VITPASJ1 to be the closest neighbour of Enterobacter cloacae...
May 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28509844/influence-of-nano-hydroxyapatite-on-the-metal-bioavailability-plant-metal-accumulation-and-root-exudates-of-ryegrass-for-phytoremediation-in-lead-polluted-soil
#10
Ling Ding, Jianbing Li, Wei Liu, Qingqing Zuo, Shu-Xuan Liang
Lead is recognized as one of the most widespread toxic metal contaminants and pervasive environmental health concerns in the environment. In this paper, the effects of nano-hydroxyapatite (NHAP) on remediation in artificially Pb-contaminated soils and ryegrass were studied in a pot experiment. The addition of NHAP decreased the water- and acid-soluble, exchangeable, and reducible fractions of Pb, extracted using the Community Bureau of Reference (BCR) method, whilst greatly increasing the residual fraction of Pb...
May 16, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28501571/enhanced-biodegradation-of-pahs-in-historically-contaminated-soil-by-m-%C3%A2-gilvum-inoculated-biochar
#11
Bijing Xiong, Youchi Zhang, Yanwei Hou, Hans Peter H Arp, Brian J Reid, Chao Cai
The inoculation of rice straw biochar with PAH-degrading Mycobacterium gilvum (1.27 × 10(11) ± 1.24 × 10(10) cell g(-1)), and the subsequent amendment of this composite material to PAHs contaminated (677 mg kg(-1)) coke plant soil, was conducted in order to investigate if would enhance PAHs biodegradation in soils. The microbe-biochar composite showed superior degradation capacity for phenanthrene, fluoranthene and pyrene. Phenanthrene loss in the microbe-biochar composite, free cell alone and biochar alone treatments was, respectively, 62...
May 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28501336/bioethanol-production-from-recovered-napier-grass-with-heavy-metals
#12
Chun-Han Ko, Fan-Chun Yu, Fang-Chih Chang, Bing-Yuan Yang, Wen-Hua Chen, Wen-Song Hwang, Ta-Chih Tu
Using plants to absorb and accumulate heavy metals from polluted soil, followed by the recycling of explants containing heavy metals, can help achieve the goal of reverting contaminated soil to low heavy-metal content soil. However, the re-use of recovered explants can also be problematic. Meanwhile, bioethanol has become a popular energy source. In this study, napier grass was used for the remediation of soil contaminated with heavy metals (artificially contaminated soil). The influence of bioethanol production from napier grass after phytoremediation was also investigated...
May 11, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28500873/evaluation-methods-for-assessing-effectiveness-of-in-situ-remediation-of-soil-and-sediment-contaminated-with-organic-pollutants-and-heavy-metals
#13
REVIEW
Biao Song, Guangming Zeng, Jilai Gong, Jie Liang, Piao Xu, Zhifeng Liu, Yi Zhang, Chen Zhang, Min Cheng, Yang Liu, Shujing Ye, Huan Yi, Xiaoya Ren
Soil and sediment contamination has become a critical issue worldwide due to its great harm to the ecological environment and public health. In recent years, many remediation technologies including physical, chemical, biological, and combined methods have been proposed and adopted for the purpose of solving the problems of soil and sediment contamination. However, current research on evaluation methods for assessing these remediation technologies is scattered and lacks valid and integrated evaluation methods for assessing the remediation effectiveness...
May 10, 2017: Environment International
https://www.readbyqxmd.com/read/28499180/bioremediation-of-phenol-in-soil-through-using-a-mobile-plant-endophyte-system
#14
Jun Chen, Li Zhang, Qing Jin, Cuizhu Su, Lei Zhao, Xiaoxiang Liu, Shumeng Kou, Yujing Wang, Ming Xiao
Plant-endophyte remediation of volatile pollutants in soil is an emerging technology. For more efficient application, plant-endophyte systems were formed through stimulation of transfer of degradative plasmids in plant tissue by co-inoculation of corn, wheat or tomato seedlings with Pseudomonas fluorescens TP13 carrying a self-transmissible degradative plasmid, and P. fluorescens streptomycin-resistant P13 strain. The corn-TP13-P13 (CTP) system had higher degradation activity than other plant-endophyte systems...
May 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28499177/the-dechlorination-of-pentachlorophenol-under-a-sulfate-and-iron-reduction-co-occurring-anaerobic-environment
#15
Lili Xue, Xi Feng, Yan Xu, Xinfeng Li, Min Zhu, Jianming Xu, Yan He
An anaerobic soil slurry incubation experiment was conducted by controlling different Fe/S mole ratios (1/3, 1/2, 1/1, 2/1, 3/1, 8/1 and the control without sulfate) through the addition of sodium sulfate, to investigate the effect of sulfate and iron reduction on the reductive dechlorination of pentachlorophenol (PCP). Two sequential incubation periods were carried out with the stage I incubation conducted under a low electron donor concentration (0.5 mM lactate) and stage II incubation conducted under increased electron donor supply with lactate at 20 mM...
April 25, 2017: Chemosphere
https://www.readbyqxmd.com/read/28494357/biosurfactant-producing-microorganism-pseudomonas-sp-sb-assists-the-phytoremediation-of-ddt-contaminated-soil-by-two-grass-species
#16
Beibei Wang, Qingling Wang, Wuxing Liu, Xiaoyan Liu, Jinyu Hou, Ying Teng, Yongming Luo, Peter Christie
Phytoremediation together with microorganisms may confer the advantages of both phytoremediation and microbial remediation of soils containing organic contaminants. In this system biosurfactants produced by Pseudomonas sp. SB may effectively help to increase the bioavailability of organic pollutants and thereby enhance their microbial degradation in soil. Plants may enhance the rhizosphere environment for microorganisms and thus promote the bioremediation of contaminants. In the present pot experiment study, dichlorodiphenyltrichloroethane (DDT) residues underwent an apparent decline after soil bioremediation compared with the original soil...
April 25, 2017: Chemosphere
https://www.readbyqxmd.com/read/28494356/appraising-the-role-of-environment-friendly-chelants-in-alleviating-lead-by-coronopus-didymus-from-pb-contaminated-soils
#17
Gagan Preet Singh Sidhu, Harminder Pal Singh, Daizy R Batish, Ravinder Kumar Kohli
In a screenhouse experiment, we investigated the role of two environment friendly chelants, Ammonium molybdate and EDDS for Pb mobilisation and its extraction by Coronopus didymus under completely randomized controlled conditions. Seedlings of C. didymus were grown in pots having Pb-contaminated soil (1200 and 2200 mg kg(-1)) for 6 weeks. Plants were harvested, 1 week after the addition of A. molybdate and EDDS. Results revealed that A. molybdate and EDDS enhanced the uptake and accumulation of Pb in roots and shoots of C...
May 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28494298/remediation-of-pah-polluted-soils-using-a-soil-microbial-fuel-cell-influence-of-electrode-interval-and-role-of-microbial-community
#18
Bao Yu, Jing Tian, Liu Feng
The soil microbial fuel cells (SMFCs) were constructed to remediate soils contaminated by polycyclic aromatic hydrocarbons (PAHs). With a maximum power density of 12.1mWm(-2) and an internal resistance of 470Ω, a closed SMFC showed electricity generation comparable to that by an open SMFC after 175days of operation and meanwhile increased the removal rates of anthracene, phenanthrene, and pyrene to 54.2±2.7%, 42.6±1.9% and 27.0±2.1% from 20.8±1.1%, 17.3±1.2% and 11.7±0.9%, respectively, by the open SMFC...
April 28, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28494293/fate-of-arsenic-before-and-after-chemical-enhanced-washing-of-an-arsenic-containing-soil-in-hong-kong
#19
Jingzi Beiyuan, Jiang-Shan Li, Daniel C W Tsang, Lei Wang, Chi Sun Poon, Xiang-Dong Li, Scott Fendorf
This study evaluated the feasibility of 2-h chemical-enhanced washing of As-containing soil resulting from geogenic sources in Hong Kong and the fate of As before and after remediation. The soil morphology and As speciation in soil was elucidated by scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. Integrated analysis of the results suggests that the As (>90%) resides predominantly as arsenate bound to ferric iron oxides, with a minor contribution (<10%) from an As(III)-sulphide phase...
May 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28493951/properties-of-biochar-derived-from-wood-and-high-nutrient-biomasses-with-the-aim-of-agronomic-and-environmental-benefits
#20
Rimena R Domingues, Paulo F Trugilho, Carlos A Silva, Isabel Cristina N A de Melo, Leônidas C A Melo, Zuy M Magriotis, Miguel A Sánchez-Monedero
Biochar production and use are part of the modern agenda to recycle wastes, and to retain nutrients, pollutants, and heavy metals in the soil and to offset some greenhouse gas emissions. Biochars from wood (eucalyptus sawdust, pine bark), sugarcane bagasse, and substances rich in nutrients (coffee husk, chicken manure) produced at 350, 450 and 750°C were characterized to identify agronomic and environmental benefits, which may enhance soil quality. Biochars derived from wood and sugarcane have greater potential for improving C storage in tropical soils due to a higher aromatic character, high C concentration, low H/C ratio, and FTIR spectra features as compared to nutrient-rich biochars...
2017: PloS One
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