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https://www.readbyqxmd.com/read/29150503/carbon-amendments-alter-microbial-community-structure-and-net-mercury-methylation-potential-in-sediments
#1
Geoff A Christensen, Anil C Somenahally, James G Moberly, Carrie M Miller, Andrew J King, Cynthia C Gilmour, Steven D Brown, Mircea Podar, Craig C Brandt, Scott C Brooks, Anthony V Palumbo, Judy D Wall, Dwayne A Elias
Neurotoxic methylmercury (MeHg) is produced by anaerobic Bacteria and Archaea possessing the genes hgcAB, but it is unknown how organic substrate and electron acceptor availability impact the distribution and abundance of these organisms. We evaluated the impact of organic substrate amendments on mercury (Hg) methylation rates, microbial community structure, and the distribution of hgcAB(+) microbes with sediments. Sediment slurries were amended with short-chain fatty acids, alcohols, or a polysaccharide. Minimal increases in MeHg were observed following lactate, ethanol and methanol amendments while a significant decrease (∼70%) was observed with cellobiose incubations...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29149751/massive-arrival-of-desalinated-seawater-in-a-regional-urban-water-cycle-a-multi-isotope-study-b-s-o-h
#2
W Kloppmann, Ido Negev, Joseph Guttman, Orly Goren, Ittai Gavrieli, Catherine Guerrot, Christine Flehoc, Marie Pettenati, Avihu Burg
"Man-made" or unconventional freshwater, like desalinated seawater or reclaimed effluents, is increasingly introduced into regional water cycles in arid or semi-arid countries. We show that the breakthrough of reverse osmosis-derived freshwater in the largely engineered water cycle of the greater Tel Aviv region (Dan Region) has profoundly changed previous isotope fingerprints. This new component can be traced throughout the system, from the drinking water supply, through sewage, treated effluents, and artificially recharged groundwater at the largest Soil-Aquifer Treatment system in the Middle East (Shafdan) collecting all the Dan region sewage...
November 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29149750/friends-or-foes-monetized-life-cycle-assessment-and-cost-benefit-analysis-of-the-site-remediation-of-a-former-gas-plant
#3
Lies Huysegoms, Sandra Rousseau, Valérie Cappuyns
Site contamination is a global concern because of the potential risks for human health and ecosystem quality. Every contaminated site has its own specific characteristics and the increased availability and efficiency of remediation techniques makes the choice of remediation alternative increasingly complicated. In this paper an attributional Life Cycle Assessment (LCA) of the secondary environmental impacts of a site remediation is performed and its results are monetized using two different monetization techniques, namely Stepwise 2006 and Ecovalue 08...
November 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29149743/multigenerational-effects-of-salinity-in-six-clonal-lineages-of-daphnia-longispina
#4
C Venâncio, R Ribeiro, A M V M Soares, I Lopes
Sea level rise, as a consequence of climate changes, is already causing seawater intrusion in some freshwater coastal ecosystems worldwide. The increase in salinity at these freshwater coastal ecosystems may occur gradually (through groundwater) or abruptly (through extreme weather events). Moreover, many of them are also being altered and threatened by anthropogenic activities. Accordingly, the present study aimed at assessing the multigenerational lethal and sublethal effects caused by increased salinity in six clonal lineages of the freshwater cladoceran Daphnia longispina differing in their sensitivity to lethal levels of copper...
November 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29149467/geophysical-assessment-of-groundwater-potential-a-case-study-from-mian-channu-area-pakistan
#5
Muhammad Hasan, Yanjun Shang, Gulraiz Akhter, Weijun Jin
An integrated study using geophysical method in combination with pumping tests and geochemical method was carried out to delineate groundwater potential zones in Mian Channu area of Pakistan. Vertical electrical soundings (VES) using Schlumberger configuration with maximum current electrode spacing (AB/2 = 200 m) were conducted at 50 stations and 10 pumping tests at borehole sites were performed in close proximity to 10 of the VES stations. The aim of this study is to establish a correlation between the hydraulic parameters obtained from geophysical method and pumping tests so that the aquifer potential can be estimated from the geoelectrical surface measurements where no pumping tests exist...
November 17, 2017: Ground Water
https://www.readbyqxmd.com/read/29148919/bacterial-flora-analysis-of-coliforms-in-sewage-river-water-and-ground-water-using-maldi-tof-mass-spectrometry
#6
Yoshihiro Suzuki, Kouki Niina, Tomonori Matsuwaki, Kei Nukazawa, Atsushi Iguchi
The aim of this study was to rapidly and effectively analyze coliforms, which are the most fundamental indicators of water quality for fecal pollution, using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS). Coliform bacteria were isolated from municipal sewage, river water, and groundwater. For each sample, 100 isolates were determined by MALDI-TOF MS. In addition, these same 100 isolates were also identified via 16S rRNA gene sequence analysis. Obtained MALDI-TOF MS data were compared with the 16S rRNA sequencing analysis, and the validity of MALDI-TOF MS for classification of coliform bacteria was examined...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29147980/a-long-term-comparative-assessment-of-human-health-risk-to-leachate-contaminated-groundwater-from-heavy-metal-with-different-liner-systems
#7
Harshit Mishra, Subhankar Karmakar, Rakesh Kumar, Praneeth Kadambala
The handling and management of municipal solid waste (MSW) are major challenges for solid waste management in developing countries. Open dumping is still the most common waste disposal method in India. However, landfilling also causes various environmental, social, and human health impacts. The generation of heavily polluted leachate is a major concern to public health. Engineered barrier systems (EBSs) are commonly used to restrict potentially harmful wastes by preventing the leachate percolation to groundwater and overflow to surface water bodies...
November 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29146079/occurrence-of-chlorinated-volatile-organic-compounds-vocs-in-a-sanitary-sewer-system-implications-for-assessing-vapor-intrusion-alternative-pathways
#8
Mohammadyousef Roghani, Olivia P Jacobs, Anthony Miller, Evan J Willett, James A Jacobs, C Ricardo Viteri, Elham Shirazi, Kelly G Pennell
Sewer systems have been recently recognized as potentially important exposure pathways to consider during vapor intrusion assessments; however, this pathway has not been well-characterized and there is need for additional information about the occurrence of volatile organic compounds (VOCs) in sewer systems. This paper reports the results of sewer gas sampling conducted in a sanitary sewer over the years of 2014-2017. Sewer gas samples were collected and analyzed using several different techniques, including TO-15 (grab), TO-17 (passive), Radiello® (passive) and a novel continuous monitoring technique, the Autonomous Rugged Optical Multigas Analyzer (AROMA)...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29145082/insights-into-arsenic-retention-dynamics-of-pleistocene-aquifer-sediments-by-in-situ-sorption-experiments
#9
Harald Neidhardt, Lenny H E Winkel, Ralf Kaegi, Caroline Stengel, Pham T K Trang, Vi M Lan, Pham H Viet, Michael Berg
The migration of arsenic (As) enriched groundwater into Pleistocene aquifers as a consequence of extensive groundwater abstraction represents an increasing threat to the precious water resources in Asian delta regions. Pleistocene aquifer sediments are typically rich in FeIII-(hydr)oxides and are capable to adsorb high amounts of As. This results in a pronounced accumulation of As in Pleistocene aquifers, where high As groundwater infiltrates from adjacent Holocene aquifers. However, As retention by Pleistocene aquifers over long-term time scales remains largely unknown...
November 7, 2017: Water Research
https://www.readbyqxmd.com/read/29145002/different-transport-behaviors-of-bacillus-subtilis-cells-and-spores-in-saturated-porous-media-implications-for-contamination-risks-associated-with-bacterial-sporulation-in-aquifer
#10
Qi Li, Jiakuan Yang, Wei Fan, Dandan Zhou, Xiaoyu Wang, Leilei Zhang, Mingxin Huo, John C Crittenden
In this study, we compared the transport characteristics of Bacillus subtilis cells and their spores in saturated porous media. Both the bacteria cells and spores were readily transported under lower ionic strengths (IS) (1mM), featuring high mass recovery rates (>75%). The bacteria cells recovery rate declined to 58.05% when the IS increased to 100mM; but the spores recovery rate remained at 74.54%. Spores appear to be more mobile than bacterial cells over wide range of IS. Surface properties and breakthrough curves analysis of the two bio-particles (cells and spores) indicated that attachment, straining and blocking mechanisms contribute differently to deposition processes...
November 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29143490/rock-glaciers-in-crystalline-catchments-hidden-permafrost-related-threats-to-alpine-headwater-lakes
#11
Boris P Ilyashuk, Elena A Ilyashuk, Roland Psenner, Richard Tessadri, Karin A Koinig
A global warming-induced transition from glacial to periglacial processes has been identified in mountainous regions around the world. Degrading permafrost in pristine periglacial environments can produce acid rock drainage (ARD) and cause severe ecological damage in areas underlain by sulfide-bearing bedrock. Limnological and paleolimnological approaches were used to assess and compare ARDs generated by rock glaciers, a typical landform of the mountain permafrost domain, and their effects on alpine headwater lakes with similar morphometric features and underlying bedrock geology, but characterized by different intensities of frost action in their catchments during the year...
November 15, 2017: Global Change Biology
https://www.readbyqxmd.com/read/29141685/correction-to-towards-a-balanced-view-of-the-bacterial-tree-of-life
#12
Frederik Schulz, Emiley A Eloe-Fadrosh, Robert M Bowers, Jessica Jarett, Torben Nielsen, Natalia N Ivanova, Nikos C Kyrpides, Tanja Woyke
Following publication of the original article [1], the authors pointed out that the figure shown as figure S1 is actually figure S2 and vice versa. Figure S1 should show the barcharts, and figure S2 should shows the heatmaps. Figures captions are in the correct order. 1) "...SILVA-only OTUs (37,066 97% OTUs and 1266 85% clusters) (Additional file 3: Figure S2 )..." - > ...SILVA-only OTUs (37,066 97% OTUs and 1266 85% clusters) (Additional file 3: Figure S1 )..." 2) "...in groundwater and soil (Fig. 2, Additional file 2: Figure S1 )...
November 15, 2017: Microbiome
https://www.readbyqxmd.com/read/29141474/assessment-of-immunotoxicity-in-female-fischer-344-n-and-sprague-dawley-rats-and-female-b6c3f1-mice-exposed-to-hexavalent-chromium-via-the-drinking-water
#13
Kelly A Shipkowski, Christopher M Sheth, Matthew J Smith, Michelle J Hooth, Kimber L White, Dori R Germolec
Sodium dichromate dihydrate (SDD), an inorganic compound containing hexavalent chromium (Cr(VI)), is a common environmental contaminant of groundwater sources due to widespread industrial use. There are indications in the literature that Cr(VI) may induce immunotoxic effects following dermal exposure, including acting as both an irritant and a sensitizer; however, the potential immunomodulatory effects of Cr(VI) following oral exposure are relatively unknown. Following the detection of Cr(VI) in drinking water sources, the National Toxicology Program (NTP) conducted extensive evaluations of the toxicity and carcinogenicity of SDD following drinking water exposure, including studies to assess the potential for Cr(VI) to modulate immune function...
December 2017: Journal of Immunotoxicology
https://www.readbyqxmd.com/read/29139076/extended%C3%A2-spectrum%C3%A2-beta-lactamase-esbl-producing-bacteria-isolated-from-hospital-wastewaters-rivers-and-aquaculture-sources-in-nigeria
#14
Olawale Olufemi Adelowo, Serena Caucci, Omowunmi Abosede Banjo, Ozioma Chinyere Nnanna, Eunice Olubunmi Awotipe, Florence Bosede Peters, Obasola Ezekiel Fagade, Thomas U Berendonk
Untreated wastewater is a risk factor for the spread of antibiotic resistance in the environment. However, little is known about the contribution of untreated wastewater to the burden of antibiotic resistance in the Nigerian environment. In this study, a total of 143 ceftazidime-/cefpodoxime-resistant bacteria isolated from untreated wastewater and untreated wastewater-contaminated surface and groundwater in Nigeria were screened for extended-spectrum β-lactamase (ESBL) genes, integrons and integron gene cassettes by PCR...
November 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29139075/investigation-of-the-effects-of-slow-release-fertilizer-and-struvite-in-biodegradation-in-filter-drains-and-potential-application-of-treated-water-in-irrigation-of-road-verges
#15
Stephen C Theophilus, Fredrick U Mbanaso, Ernest O Nnadi, Kingsley T Onyedeke
Filter drains are usually laid along the margins of highways. Highway runoffs are polluted with hydrocarbons and high levels of total dissolved solids. Therefore, effective pollution removal mechanism is necessary in order to avoid contamination of surrounding soils and groundwater. Biodegradation is amongst pollution removal mechanisms in filter drains, but it is a relatively slow process which is dependent on wide range of factors including the type of pollutant and availability of nutrients. This paper reports on a study conducted to investigate the impact of slow-release fertilizer and struvite in enhancement of biodegradation of hydrocarbon in filter drains...
November 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29139074/excessive-use-of-nitrogenous-fertilizers-an-unawareness-causing-serious-threats-to-environment-and-human-health
#16
Moddassir Ahmed, Muhammad Rauf, Zahid Mukhtar, Nasir Ahmad Saeed
Farmers occasionally need to add nitrogen fertilizer to their farms and gardens to make available just the precise nutrients for their plants' growth. The applications of inorganic nitrogen fertilizers to various crops have been continuously increasing since last many decades globally. Although nitrogen fertilizer contributes substantially to yield enhancement, but excessive use of this manure has posed serious threats to environment and human health. Rate of nitrogen fertilizers application has a close relationship with nitrate accumulation in surrounding environment, groundwater, as well as leafy and root vegetables...
November 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29136518/evidence-of-co-metabolic-bentazone-transformation-by-methanotrophic-enrichment-from-a-groundwater-fed-rapid-sand-filter
#17
Mathilde J Hedegaard, Hélène Deliniere, Carsten Prasse, Arnaud Dechesne, Barth F Smets, Hans-Jørgen Albrechtsen
The herbicide bentazone is recalcitrant in aquifers and is therefore frequently detected in wells used for drinking water production. However, bentazone degradation has been observed in filter sand from a rapid sand filter at a waterworks with methane-rich groundwater. Here, the association between methane oxidation and removal of bentazone was investigated with a methanotrophic enrichment culture derived from methane-fed column reactors inoculated with that filter sand. Several independent lines of evidence obtained from microcosm experiments with the methanotrophic enrichment culture, tap water and bentazone at concentrations below 2 mg/L showed methanotrophic co-metabolic bentazone transformation: The culture removed 53% of the bentazone in 21 days in presence of 5 mg/L of methane, while only 31% was removed in absence of methane...
November 3, 2017: Water Research
https://www.readbyqxmd.com/read/29135536/investigating-uranium-isotopic-ratios-and-activity-ratios-in-groundwaters-in-the-state-of-idaho
#18
Levan Tkavadze, Richard R Brey, John Dudgeon
Analyzing uranium isotopic and activity ratios can give valuable information for hydrologic and environmental studies such as insights to weathering processes, estimating water mixing ratios, and identifying water sources. The authors employed an inductively coupled plasma mass spectrometer (ICP-MS) to perform environmental level concentration measurements of isotopic uranium on 380 groundwater samples from various locations within the state of Idaho. The U:U uranium activity ratios (UAR) for these samples range between 0...
November 10, 2017: Health Physics
https://www.readbyqxmd.com/read/29132007/asta-a-method-for-multi-criteria-evaluation-of-water-supply-technologies-to-assess-the-most-sustainable-alternative-for-copenhagen
#19
B Godskesen, M Hauschild, H-J Albrechtsen, M Rygaard
Utilities in larger cities have to make complex decisions planning future investments in urban water infrastructure. Changes are driven by physical water stress or political targets for environmental water flows e.g. through the implementation of the European water framework directive. To include these environmental, economic and social sustainability dimensions we introduce a novel multi-criteria assessment method for evaluation of water supply technologies. The method is presented and demonstrated for four alternatives for water supply based on groundwater, rain- & stormwater or seawater developed for augmenting Copenhagen's current groundwater based water supply...
November 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29132005/discriminant-analysis-as-a-decision-making-tool-for-geochemically-fingerprinting-sources-of-groundwater-salinity
#20
Nathaniel P Chien, Laura K Lautz
Concern over contamination of groundwater resources in areas impacted by anthropogenic activities has led to an increasing number of baseline groundwater quality surveys intended to provide context for interpreting water quality data. Flexible screening tools that can parse through these large, regional datasets to identify spatial or temporal changes in water quality are becoming more important to groundwater scientists. One such tool, developed from previous work by the authors, makes use of linear discriminant analysis (LDA) to identify the most probable source of chloride salinity in groundwater samples based on their geochemical fingerprints...
November 10, 2017: Science of the Total Environment
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