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https://www.readbyqxmd.com/read/29339606/study-of-aggregation-in-surface-sludge-deposits-from-14-full-scale-french-constructed-wetlands-using-particle-size-distribution-and-dynamic-vapor-sorption-analyses
#1
M Kania, M Gautier, P Michel, R Gourdon
French vertical flow constructed wetlands (French VFCWs) are widely used for the treatment of wastewaters from small communities. In the system, unsettled wastewater is percolated through two successive stages of filter-cells planted with reeds. This causes the formation of a surface sludge layer. This layer plays positive roles in the treatment performance, but also leads to clogging. The objective of this study was to contribute to the description of the sludge deposits characteristics and their dynamics of evolution, which may control the development of clogging...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29335587/bacterial-and-fungal-community-composition-and-functional-activity-associated-with-lake-wetland-water-level-gradients
#2
Yantian Ma, Jinqian Li, Juan Wu, Zhaoyu Kong, Larry M Feinstein, Xia Ding, Gang Ge, Lan Wu
The water regime is often the primary force driving the evolution of freshwater lakes, but how soil microbes responded to this process is far from understood. This study sampled wetland soils from a shallow lake that experienced water regime changes, Poyang Lake of China, to explore the features of bacterial and fungal community in response to water level changes. The soil physicochemical properties, T-RFLP based community structures and soil activities (including basal respiration, microbial biomass and enzymes) were all determined...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330866/enteric-viruses-dissemination-in-a-private-reserve-of-natural-heritage
#3
T M Fumian, M Victoria, C B Vieira, J M Fioretti, M S Rocha, T Prado, F R Guimarães, N P da Gama, J M de Oliveira, A C O Mendes, A M C Gaspar, J D O Santos, M Chame, J P G Leite, M P Miagostovich
This study aimed to assess anthropogenic impact of surrounding population in the Private Reserve of Natural Heritage at Pantanal, the world's largest freshwater wetland ecosystem located in the center of South America. Viral etiologic agents of acute gastroenteritis as rotavirus A (RVA), noroviruses (NoV), human adenoviruses (HAdV), klassevirus (KV) and of hepatitis, as hepatitis A virus (HAV), were investigated in different aquatic matrices. Annual collection campaigns were carried out from 2009 to 2012, alternating dry and rainy seasons...
January 13, 2018: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29330823/metal-concentrations-in-tissues-of-gadwall-and-common-teal-from-miankaleh-and-gomishan-international-wetlands-iran
#4
Mohammad-Hosein Sinkakarimi, Lukasz J Binkowski, Mehdi Hassanpour, Ghasem Rajaei, Mohsen Ahmadpour, Jeffrey M Levengood
Miankaleh and Gomishan International Wetlands are important wintering areas for waterbirds in the Caspian Sea region. Previous studies revealed increased exposure to metals in some species of waterbirds using these wetlands. In this study, we examined concentrations of cadmium (Cd), chromium (Cr), iron (Fe), lead (Pb), and zinc (Zn) in kidneys, liver, and pectoral muscle of wintering Gadwall (Anas strepera) and Common Teal (Anas crecca) collected in 2012. In addition, we measured concentrations of these elements in water and sediments from the collection sites...
January 13, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29330819/preparation-of-a-synthetic-seed-for-the-common-reed-harboring-an-endophytic-bacterium-promoting-seedling-growth-under-cadmium-stress
#5
Ting Gao, Xianyang Shi
Bacterial seed endophytes can facilitate germination and early plant development. Therefore, the introduction of seed-borne endophytes may improve selected plant characteristics across generations. In this study, regenerated plantlets of common reed (Phragmites australis) were inoculated with activated sludge to obtain a specific functional endophytic bacterium. Denaturing gradient gel electrophoresis demonstrated that abundant endophytic bacteria could be enriched in the roots. A siderophore-producing endophytic bacterium was isolated from the roots and identified as Herbaspirillum frisingense RE3-3 based on 16S rRNA sequences...
January 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29330602/ecosystem-carbon-emissions-from-2015-forest-fires-in-interior-alaska
#6
Christopher Potter
BACKGROUND: In the summer of 2015, hundreds of wildfires burned across the state of Alaska, and consumed more than 1.6 million ha of boreal forest and wetlands in the Yukon-Koyukuk region. Mapping of 113 large wildfires using Landsat satellite images from before and after 2015 indicated that nearly 60% of this area was burned at moderate-to-high severity levels. Field measurements near the town of Tanana on the Yukon River were carried out in July of 2017 in both unburned and 2015 burned forested areas (nearly adjacent to one-another) to visually verify locations of different Landsat burn severity classes (low, moderate, or high; LBS, MBS, HBS)...
January 8, 2018: Carbon Balance and Management
https://www.readbyqxmd.com/read/29330518/spartina-alterniflora-invasion-affects-soil-carbon-in-a-c3-plant-dominated-tidal-marsh
#7
Min Wang, Qing Wang, Chenyan Sha, Jiakuan Chen
The carbon cycle is significantly affected by Spartina alterniflora invasion through its impact on blue carbon in many salt marshes. To determine the impacts on soil organic carbon (SOC), we studied the vertical and horizontal distribution of SOC. And stable carbon isotopes were used to explore the impact of the age of S. alterniflora invasion on SOC in Chongming Dongtan wetland located in the Yangtze River estuary, China. The results showed that the SOC concentration was higher in the S. alterniflora community than that in the native Phragmites australis community...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29327193/effect-of-vegetation-type-on-treatment-performance-and-bioelectric-production-of-constructed-wetland-modules-combined-with-microbial-fuel-cell-cw-mfc-treating-synthetic-wastewater
#8
Çağdaş Saz, Cengiz Türe, Onur Can Türker, Anıl Yakar
An operation of microcosm-constructed wetland modules combined with microbial fuel cell device (CW-MFC) was assessed for wastewater treatment and bioelectric generation. One of the crucial aims of the present experiment is also to determine effect of vegetation on wastewater treatment process and bioelectric production in wetland matrix with microbial fuel cell. Accordingly, CW-MFC modules with vegetation had higher treatment efficiency compared to unplanted wetland module, and average COD, NH4+, and TP removal efficiency in vegetated wetland modules were ranged from 85 to 88%, 95 to 97%, and 95 to 97%, respectively...
January 11, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29326968/data-on-wastewater-treatment-plant-by-using-wetland-method-babol-iran
#9
Yousef Dadban Shahamat, Hosseinali Asgharnia, Laleh R Kalankesh, Mehdi Hosanpour
Date in this paper highlights the applications of constructed horizontal surface flow (HF-CW) wetland with two different local plants (Louis latifoila and Phragmites -australis (Cav.) Trin) at the wastewater treatment plant in Babol city. This system was designed as an advanced treatment unit in field scale after the treatment plant. Parameters such as Total Dissolved Solid (TDS), Total Suspended Solid (TSS), Turbidity, Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), were investigated. The result shows that treatment efficiency increases with the passage of time...
February 2018: Data in Brief
https://www.readbyqxmd.com/read/29324791/sediment-biomarkers-elucidate-the-holocene-ontogeny-of-a-shallow-lake
#10
T E Arnold, W F Kenney, J H Curtis, T S Bianchi, M Brenner
We carried out geochemical analyses on a sediment core from Lake Harris, Florida (USA) to identify sources of organic matter to the sediment throughout the Holocene, and relate changes in those sources to shifts in past climate and environmental conditions. We hypothesized that the sources of organic matter changed in response to regional hydrologic shifts following de-glaciation, and to human population expansion in the state during the 20th century. Hydroclimate shifts in Florida were related to: 1) a steady rise in relative sea level and the fresh water table that began in the early Holocene, 2) wetland formation and expansion ca...
2018: PloS One
https://www.readbyqxmd.com/read/29315528/resource-competition-model-predicts-zonation-and-increasing-nutrient-use-efficiency-along-a-wetland-salinity-gradient
#11
D R Schoolmaster, C L Stagg
A trade-off between competitive ability and stress tolerance has been hypothesized and empirically supported to explain the zonation of species across stress gradients for a number of systems. Since stress often reduces plant productivity, one might expect a pattern of decreasing productivity across the zones of the stress gradient. However, this pattern is often not observed in coastal wetlands that show patterns of zonation along a salinity gradient. To address the potentially complex relationship between stress, zonation and productivity in coastal wetlands, we developed a model of plant biomass as a function of resource competition and salinity stress...
January 8, 2018: Ecology
https://www.readbyqxmd.com/read/29314392/using-isotopic-spike-from-tropical-storm-to-understand-water-exchange-on-large-scale-case-study-of-hurricane-rafael-in-the-lesser-antilles-archipelago-october-2012
#12
Luc Lambs, Félix Bompy, Maguy Dulormne
RATIONALE: Studies of wetland eco-hydrology in tropical coastal area are scarce, and the use of water stable isotopes can be of great help. Key constraints for their analysis are (i) the small difference in δ18 O values between seawater and old evaporated freshwater, and (ii) the fact that the presence of old brackish water limits the determination of the water origin and dynamic. METHODS: The water of tropical storms displays distinctively depleted heavy stable isotopes, in comparison with usual tropical rainfall without strong convective thunderstorms...
January 3, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29313198/treatment-for-domestic-wastewater-from-university-dorms-using-a-hybrid-constructed-wetland-at-pilot-scale
#13
Yuting He, Lian Peng, Yumei Hua, Jianwei Zhao, Naidong Xiao
A hybrid constructed wetland (CW) system was operated at pilot scale to evaluate the treatment of domestic wastewater from university dorms in Hubei province, China. The hybrid system consisted of an integrated vertical flow constructed wetland (IVF CW) (a down-flow VF CW and an up-flow VF CW) and a horizontal subsurface flow constructed wetland (HSF CW). The influent for the hybrid CW containing chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), and ammonium nitrogen (NH4+-N) with mean concentrations of 152, 0...
January 8, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29313064/genetic-diversity-of-bartonella-spp-in-wild-mammals-and-ectoparasites-in-brazilian-pantanal
#14
Keyla Carstens Marques de Sousa, Renan Bressianini do Amaral, Heitor Miraglia Herrera, Filipe Martins Santos, Gabriel Carvalho Macedo, Pedro Cordeiro Estrela de Andrade Pinto, Darci Moraes Barros-Battesti, Rosangela Zacarias Machado, Marcos Rogério André
The present work aimed to investigate the genetic diversity of Bartonella in mammals and ectoparasites in Pantanal wetland, Brazil. For this purpose, 31 Nasua nasua, 78 Cerdocyon thous, 7 Leopardus pardalis, 110 wild rodents, 30 marsupials, and 42 dogs were sampled. DNA samples were submitted to a quantitative real-time PCR assay (qPCR). Positive samples in qPCR were submitted to conventional PCR assays targeting other five protein-coding genes. Thirty-five wild rodents and three Polygenis (P.) bohlsi bohlsi flea pools showed positive results in qPCR for Bartonella spp...
January 8, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/29306699/photochemical-acetochlor-degradation-induced-by-hydroxyl-radical-in-fe-amended-wetland-waters-impact-of-ph-and-dissolved-organic-matter
#15
Chenyi Yuan, Yu-Ping Chin, Linda K Weavers
Iron (Fe) plays a critical role in the formation of hydroxyl radical (OH) which may participate in the indirect photodegradation of aquatic contaminants. While Fe photochemistry has been extensively studied, the efficacy of iron amendments for contaminant attenuation in sunlit natural waters has not been well researched. We studied the efficacy of this approach by monitoring OH induced acetochlor (AC) degradation and determining OH production rates with terephthalate (TPA) as a probe. Surface wetland waters as well as model fulvic acid (FA) solutions were amended with Fe(III) salt at different concentrations at pH values of 2...
November 27, 2017: Water Research
https://www.readbyqxmd.com/read/29306198/a-glyphosate-based-herbicide-reduces-fertility-embryonic-upper-thermal-tolerance-and-alters-embryonic-diapause-of-the-threatened-annual-fish-austrolebias-nigrofasciatus
#16
Yuri Dornelles Zebral, Luize Real Lansini, Patrícia Gomes Costa, Mauricio Roza, Adalto Bianchini, Ricardo Berteaux Robaldo
Roundup is the most popular glyphosate-based herbicide (GBH) worldwide. These formulations kill a wide range of plants. Despite that, non-target species can be jeopardized by GBH, such as the annual fish Austrolebias nigrofasciatus. This species occurs in wetlands that dries annually. Key-adaptations permit them to live in such harsh habitats, e. i. Elevated fertility, drought-tolerant diapausing embryos and elevated thermal tolerance. We aimed to evaluate acute (96 h) effects of Roundup exposure (0.36 or 3...
January 2, 2018: Chemosphere
https://www.readbyqxmd.com/read/29306166/shifts-in-soil-bacterial-and-archaeal-communities-during-freeze-thaw-cycles-in-a-seasonal-frozen-marsh-northeast-china
#17
Jiusheng Ren, Changchun Song, Aixin Hou, Yanyu Song, Xiaoyan Zhu, Grace Ann Cagle
Diurnal freeze-thaw cycles (FTCs) occur in the spring and autumn in boreal wetlands as soil temperatures rise above freezing during the day and fall below freezing at night. A surge in methane emissions from these systems is frequently documented during spring FTCs, accounting for a large portion of annual emissions. In boreal wetlands, methane is produced as a result of syntrophic microbial processes, mediated by a consortium of fermenting bacteria and methanogenic archaea. Further research is needed to determine whether FTCs enhance microbial metabolism related to methane production through the cryogenic decomposition of soil organic matter...
January 3, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29306163/influence-of-stormwater-runoff-on-macroinvertebrates-in-a-small-urban-river-and-a-reservoir
#18
Ryszard Gołdyn, Barbara Szpakowska, Dariusz Świerk, Piotr Domek, Jan Buxakowski, Renata Dondajewska, Danuta Barałkiewicz, Adam Sajnóg
The impact of stormwater on benthic macroinvertebrates was studied in two annual cycles. Five small catchments drained by stormwater sewers to a small urban river and a small and shallow reservoir situated in its course were selected. These catchments were located in residential areas with single-family houses or blocks of flats as well as industrial areas, i.e., a car factory, a glassworks and showroom as well as the parking lots of a car dealer and servicing company. In addition to the five stations situated in the vicinity of the stormwater outlets, three stations not directly influenced by stormwater were also established...
January 3, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29303570/diffusive-gradients-in-thin-films-dgt-reveals-antimony-and-arsenic-mobility-differs-in-a-contaminated-wetland-sediment-during-an-oxic-anoxic-transition
#19
Maja Arsic, Peter R Teasdale, David Thomas Welsh, Scott G Johnston, Edward D Burton, Kerstin Hockmann, William Walpole Bennett
Antimony (Sb) and arsenic (As) are priority environmental contaminants that often co-occur at mining-impacted sites. Despite their chemical similarities, Sb mobility in waterlogged sediments is poorly understood in comparison to As, particularly across the sediment-water interface (SWI) where changes can occur at the millimetre scale. Combined diffusive gradients in thin films (DGT) and diffusive equilibration in thin films (DET) techniques provided a high resolution, in situ comparison between Sb, As and iron (Fe) speciation and mobility across the SWI in contaminated freshwater wetland sediment mesocosms under an oxic-anoxic-oxic transition...
January 5, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29302907/the-effects-of-different-aeration-strategies-on-the-performance-of-constructed-wetlands-for-phosphorus-removal
#20
Huma Ilyas, Ilyas Masih
The effects of different aeration methods such as tidal flow (TF), effluent recirculation (ER), and artificial aeration (AA) on the performance of vertical-flow constructed wetland (VFCW), horizontal-flow constructed wetland (HFCW), and hybrid constructed wetland (HCW) are extensively and critically evaluated in this review paper. Aerated constructed wetlands (CWs) demonstrate superior performance compared with non-aerated systems. The removal of total phosphorus (TP) showed substantial variation among different types of CWs and aeration strategies, with mean and standard deviation of 68 ± 20% estimated from all reviewed studies on aerated systems...
January 4, 2018: Environmental Science and Pollution Research International
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