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https://www.readbyqxmd.com/read/28078980/bioremediation-of-toxic-heavy-metals-a-patent-review
#1
Neelam Verma, Rajni Sharma
BACKGROUND: The global industrialization is fulfilling the demands of modern population at the cost of environmental exposure to various contaminants including heavy metals. These heavy metals affect water and soil quality. Moreover these enter into the food chain and exhibit their lethal effects on the human health even when present at slightly higher concentration than required for normal metabolism. To the worst of their part, the heavy metals may become carcinogenic. Henceforth, the efficient removal of heavy metals is the demand of sustainable development...
January 11, 2017: Recent Patents on Biotechnology
https://www.readbyqxmd.com/read/28074371/microbial-flora-analysis-for-the-degradation-of-beta-cypermethrin
#2
Zhang Qi, Zhang Wei
In the Xinjiang region of Eurasia, sustained long-term and continuous cropping of cotton over a wide expanse of land is practiced, which requires application of high levels of pyrethroid and other classes of pesticides-resulting in high levels of pesticide residues in the soil. In this study, soil samples were collected from areas of long-term continuous cotton crops with the aim of obtaining microbial resources applicable for remediation of pyrethroid pesticide contamination suitable for the soil type and climate of that area...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28074369/mitigating-cadmium-accumulation-in-greenhouse-lettuce-production-using-biochar
#3
Ruilun Zheng, Guoxin Sun, Cui Li, Brian J Reid, Zubin Xie, Bo Zhang, Qinghai Wang
Greenhouse experiments were conducted to investigate the influence of rice straw biochar (RSB) on soil cadmium (Cd) availability and accumulation in lettuce. The RSB was applied either in bands or broadcast in the test site of four greenhouses with soil Cd concentrations ranging from 1.70-3.14 μg g(-1). Biochar doses applied in bands were half of those broadcast. The Cd levels in the shoots of lettuce were observed to be reduced by up to 57% with increasing RSB application rate (0, 6, 12, 18 t ha(-1))...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28074366/improved-slant-drilling-well-for-in-situ-remediation-of-groundwater-and-soil-at-contaminated-sites
#4
Yasuhide Furukawa, Kazuhiro Mukai, Keisuke Ohmura, Takeshi Kobayashi
Soil contamination has become a crucial issue in urban redevelopment. Japan has many contaminated sites on which manufacturing has been conducted over several decades. Site holders are now under pressure to manage chemical contamination; however, the use of heavy machinery is difficult in remedial operations on restricted sites, especially where there are still working factories. The slant well is a potentially useful technique in such settings, but its use is technically challenging because of the need for high drilling accuracy and the difficulty in sealing the slanted bores...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28074219/bioremediation-of-mercury-not-properly-exploited-in-contaminated-soils
#5
REVIEW
Khandaker Rayhan Mahbub, Md Mezbaul Bahar, Maurizio Labbate, Kannan Krishnan, Stuart Andrews, Ravi Naidu, Mallavarapu Megharaj
Contamination of land and water caused by heavy metal mercury (Hg) poses a serious threat to biota worldwide. The seriousness of toxicity of this neurotoxin is characterized by its ability to augment in food chains and bind to thiol groups in living tissue. Therefore, different remediation approaches have been implemented to rehabilitate Hg-contaminated sites. Bioremediation is considered as cheaper and greener technology than the conventional physico-chemical means. Large-scale use of Hg-volatilizing bacteria are used to clean up Hg-contaminated waters, but there is no such approach to remediate Hg-contaminated soils...
January 10, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28073496/the-re-eutrophication-of-lake-erie-harmful-algal-blooms-and-hypoxia
#6
REVIEW
Susan B Watson, Carol Miller, George Arhonditsis, Gregory L Boyer, Wayne Carmichael, Murray N Charlton, Remegio Confesor, David C Depew, Tomas O Höök, Stuart A Ludsin, Gerald Matisoff, Shawn P McElmurry, Michael W Murray, R Peter Richards, Yerubandi R Rao, Morgan M Steffen, Steven W Wilhelm
Lake Erie supplies drinking water to more than 11 million consumers, processes millions of gallons of wastewater, provides important species habitat and supports a substantial industrial sector, with >$50 billion annual income to tourism, recreational boating, shipping, fisheries, and other industries. These and other key ecosystem services are currently threatened by an excess supply of nutrients, manifested in particular by increases in the magnitude and extent of harmful planktonic and benthic algal blooms (HABs) and hypoxia...
June 2016: Harmful Algae
https://www.readbyqxmd.com/read/28068645/characteristics-of-pah-tar-oil-contaminated-soils-black-particles-resins-and-implications-for-treatment-strategies
#7
Clément Trellu, Anja Miltner, Rosita Gallo, David Huguenot, Eric D van Hullebusch, Giovanni Esposito, Mehmet A Oturan, Matthias Kästner
Tar oil contamination is a major environmental concern due to health impacts of polycyclic aromatic hydrocarbons (PAH) and the difficulty of reaching acceptable remediation end-points. Six tar oil-contaminated soils with different industrial histories were compared to investigate contamination characteristics by black particles. Here we provide a simple method tested on 6 soils to visualize and identify large amounts of black particles (BP) as either solid aggregates of resinified and weathered tar oil or various wood/coke/coal-like materials derived from the contamination history...
December 31, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28063656/effect-of-cyclic-redox-oscillations-on-water-quality-in-freshwater-acid-sulfate-soil-wetlands
#8
Niloofar Karimian, Scott G Johnston, Edward D Burton
Restoration of acid sulfate soil (ASS) wetlands by freshwater re-flooding can lead to the reformation of various Fe(II) and reduced inorganic sulfur (RIS) species in surface soil layers. However, in many locations, wetland water levels undergo large seasonal fluctuations that drive extreme redox oscillations. Newly formed RIS species [e.g. greigite, mackinawite, nano-pyrite and S(0)] and Fe(II) are vulnerable to rapid oxidation during dry periods and may generate substantial acidity. Rainfall following a dry period may then mobilise acidity and metal cations in surface waters prior to eventual recovery in pH by re-establishment of reducing conditions...
January 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28061345/bioaugmentation-as-a-strategy-for-the-remediation-of-pesticide-polluted-soil-a-review
#9
REVIEW
Mariusz Cycoń, Agnieszka Mrozik, Zofia Piotrowska-Seget
Bioaugmentation, a green technology, is defined as the improvement of the degradative capacity of contaminated areas by introducing specific microorganisms, has emerged as the most advantageous method for cleaning-up soil contaminated with pesticides. The present review discusses the selection of pesticide-utilising microorganisms from various sources, their potential for the degradation of pesticides from different chemical classes in liquid media as well as soil-related case studies in a laboratory, a greenhouse and field conditions...
December 26, 2016: Chemosphere
https://www.readbyqxmd.com/read/28052201/rice-husk-silica-derived-nanomaterials-for-battery-applications-a-literature-review
#10
Yafei Shen
Silica-rich rice husk (RH) is an abundant and sustainable agricultural waste. The recovery of value added products from RH or its ash to explore an economic way for the valorization of agricultural wastes have attracted wide attention. For instance, RH can be converted to biofuels and biochars simultaneously via thermochemical processes. In general, the applications of RH biochars include soil remediation, pollutants removal, silicon battery materials, etc. This review article concludes recent progresses in the synthesis of RH-derived silicon materials for lithium-ion batteries (LIBs) applications...
January 4, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28051189/metabolic-profiling-of-root-exudates-from-two-ecotypes-of-sedum-alfredii-treated-with-pb-based-on-gc-ms
#11
Qing Luo, Shiyu Wang, Li-Na Sun, Hui Wang
Phytoremediation is an effective method to remediate Pb-contaminated soils and root exudates play an important role in this process. Based on gas chromatography-mass spectrometry (GC-MS) and metabolomics method, this study focuses on the comparative metabolic profiling analysis of root exudates from the Pb-accumulating and non-accumulating ecotypes of Sedum alfredii treated with 0 and 50 μmol/L Pb. The results obtained show that plant type and Pb stress can significantly change the concentrations and species of root exudates, and fifteen compounds were identified and assumed to be potential biomarkers...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28043023/feasibility-of-pb-phytoextraction-using-nano-materials-assisted-ryegrass-results-of-a-one-year-field-scale-experiment
#12
Shu-Xuan Liang, Yu Jin, Wei Liu, Xiliang Li, Shi-Gang Shen, Ling Ding
The effect of the combined application of nano-hydroxyapatite (NHAP) or nano-carbon black (NCB) on the phytoextraction of Pb by ryegrass was investigated as an enhanced remediation technique for soils by field-scale experiment. After the addition of 0.2% NHAP or NCB to the soil, temporal variation of the uptake of Pb in aboveground parts and roots were observed. Ryegrass shoot concentrations of Pb were lower with nano-materials application than without nano-materials for the first month. However, the shoot concentrations of Pb were significantly increased with nano-materials application, in particular NHAP groups...
December 30, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/28041855/study-of-a-remediated-coal-ash-depository-from-a-radiological-perspective
#13
Jácint Jónás, János Somlai, Edit Tóth-Bodrogi, Miklós Hegedűs, Tibor Kovács
Coal-fired power plants play a significant role in the production of electricity. The Ra-226 concentration of coals mined in the Ajka region can reach up to 3000 Bq/kg. This study focuses on the effects of a Hungarian (Ajka) remediated coal ash depository on the environment and the effectiveness of the cover layer. During the remediation, a method patented in Hungary was used, in which the upper layer of the depository, which had settled like concrete, was ploughed and mixed with woodchips before being planted with vegetation...
December 29, 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28040555/juncus-spp-the-helophyte-for-all-phyto-remediation-purposes
#14
Evdokia Syranidou, Stavros Christofilopoulos, Nicolas Kalogerakis
Helophytic plants contribute significantly to the remediation of ecosystems through a wide range of physiological or biochemical mechanisms including the role of endophytic bacteria. This review highlights the services provided by Juncus spp. wetland plants, from phytoremediation of soils and groundwater with heavy metals and/or organics to municipal or industrial wastewater treatment in constructed wetlands. The data presented also provide information on the efficiency of specific Juncus spp. in response to various metals and organic compounds, in an effort to exploit the natural capabilities of autochthonous over exotic species in phytoremediation strategies...
December 28, 2016: New Biotechnology
https://www.readbyqxmd.com/read/28028706/photosynthesis-and-growth-response-of-maize-zea-mays-l-hybrids-exposed-to-cadmium-stress
#15
Tasneem Akhtar, Muhammad Zia-Ur-Rehman, Asif Naeem, Rab Nawaz, Shafaqat Ali, Ghulam Murtaza, Muhammad Aamer Maqsood, Muhammad Azhar, Hinnan Khalid, Muhammad Rizwan
Cadmium (Cd) is a biologically non-essential heavy metal while the cultivation of Cd-tolerant varieties/hybrids (V) seems the most promising strategy for remediation of Cd-contaminated soils. For this, 24-day-old seedlings of seven maize hybrids, DKC 65-25, DKC 61-25, DKC 919, 23-T-16, 32-B-33, 31-P-41, and Syn hybrid, were grown in hydroponic conditions for 21 additional days in various Cd concentrations (0, 5, 10, and 15 μM). Effects of variety, Cd, and their interaction were highly significant (p ≤ 0...
December 27, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28024809/immobilization-of-metals-in-contaminated-soils-using-natural-polymer-based-stabilizers
#16
Xue Tao, Aimin Li, Hu Yang
Three low-cost natural polymer materials, namely, lignin (Ln), carboxymethyl cellulose, and sodium alginate, were used for soil amendment to immobilize lead and cadmium in two contaminated soil samples collected from a mining area in Nanjing, China. The remediation effects of the aforementioned natural polymers were evaluated by toxicity characteristic leaching procedure (TCLP) and sequential extractions. The stabilizers could lower the bioavailability of Pb and Cd in the contaminated soils, and the amount of the exchangeable forms of the aforementioned two metals were reduced evidently...
December 24, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/28012367/effect-of-lead-pb-on-antioxidation-system-and-accumulation-ability-of-moso-bamboo-phyllostachys-pubescens
#17
Bin Zhong, Junren Chen, Mohammad Shafi, Jia Guo, Ying Wang, Jiasen Wu, Zhengqian Ye, Lizhi He, Dan Liu
The antioxidation system and accumulation ability of Moso bamboo (Phyllostachys pubescens), which is a valuable remediation material with large biomass and rapid growth rate were studied in hydroponics and pot experiments. In hydroponics experiment, TBARS concentrations and SOD activities decreased with increase of Pb treatments. The activities of POD boost up with elevated Pb treatments, and reached peak level with application of 400μM Pb. Proline concentrations reduced with application of 20μM Pb and then enhanced consistently with application of 100 and 400μM Pb...
December 21, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28011373/bioremediation-of-diuron-contaminated-soils-by-a-novel-degrading-microbial-consortium
#18
J Villaverde, M Rubio-Bellido, F Merchán, E Morillo
Diuron is a biologically active pollutant present in soil, water and sediments. It is persistent in soil, water and groundwater and slightly toxic to mammals and birds as well as moderately toxic to aquatic invertebrates. Its principal product of biodegradation, 3,4-dichloroaniline, exhibits a higher toxicity than diuron and is also persistent in the environment. On this basis, the objective of the study was to determine the potential capacity of a proposed novel diuron-degrading microbial consortium (DMC) for achieving not only diuron degradation, but its mineralisation both in solution as well as in soils with different properties...
March 1, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28011305/aerobic-and-anaerobic-biosynthesis-of-nano-selenium-for-remediation-of-mercury-contaminated-soil
#19
Xiaonan Wang, Daoyong Zhang, Xiangliang Pan, Duu-Jong Lee, Fahad A Al-Misned, M Golam Mortuza, Geoffrey Michael Gadd
Selenium (Se) nanoparticles are often synthesized by anaerobes. However, anaerobic bacteria cannot be directly applied for bioremediation of contaminated top soil which is generally aerobic. In this study, a selenite-reducing bacterium, Citrobacter freundii Y9, demonstrated high selenite reducing power and produced elemental nano-selenium nanoparticles (nano-Se(0)) under both aerobic and anaerobic conditions. The biogenic nano-Se(0) converted 45.8-57.1% and 39.1-48.6% of elemental mercury (Hg(0)) in the contaminated soil to insoluble mercuric selenide (HgSe) under anaerobic and aerobic conditions, respectively...
December 5, 2016: Chemosphere
https://www.readbyqxmd.com/read/28006730/enhancement-of-microbial-2-4-6-trinitrotoluene-transformation-with-increased-toxicity-by-exogenous-nutrient-amendment
#20
Shih-Hsiung Liang, Duen-Wei Hsu, Chia-Ying Lin, Chih-Ming Kao, Da-Ji Huang, Chih-Ching Chien, Ssu-Ching Chen, Isheng Jason Tsai, Chien-Cheng Chen
In this study, the bacterial strain Citrobacter youngae strain E4 was isolated from 2,4,6-trinitrotoluene (TNT)-contaminated soil and used to assess the capacity of TNT transformation with/without exogenous nutrient amendments. C. youngae E4 poorly degraded TNT without an exogenous amino nitrogen source, whereas the addition of an amino nitrogen source considerably increased the efficacy of TNT transformation in a dose-dependent manner. The enhanced TNT transformation of C. youngae E4 was mediated by increased cell growth and up-regulation of TNT nitroreductases, including NemA, NfsA and NfsB...
December 19, 2016: Ecotoxicology and Environmental Safety
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