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https://www.readbyqxmd.com/read/28647257/performance-of-ch4modwetland-for-the-case-study-of-different-regions-of-natural-chinese-wetland
#1
Tingting Li, Qing Zhang, Zhigang Cheng, Guocheng Wang, Lijun Yu, Wen Zhang
Reliable national estimates of CH4 emissions from natural wetlands depend on model validation based on site observations. We therefore evaluated the performance of the CH4MODwetland model in simulating CH4 emissions from 11 representative wetland sites in five regions of China. Model performance analysis showed that this method effectively simulates differences in the CH4 fluxes between different sites and regions. The model efficiency for estimating the daily CH4 fluxes in the northeastern China (NE), Inner Mongolia and northwestern China (NW), the North China plain and the Middle-Lower Yangtze Plain (E) and the Qinghai Tibetan Plateau (SW) was 0...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647250/constructed-wetlands-for-wastewater-treatment-in-cold-climate-a-review
#2
REVIEW
Mo Wang, Dong Qing Zhang, Jian Wen Dong, Soon Keat Tan
Constructed wetlands (CWs) have been successfully used for treating various wastewaters for decades and have been identified as a sustainable wastewater management option worldwide. However, the application of CW for wastewater treatment in frigid climate presents special challenges. Wetland treatment of wastewater relies largely on biological processes, and reliable treatment is often a function of climate conditions. To date, the rate of adoption of wetland technology for wastewater treatment in cold regions has been slow and there are relatively few published reports on CW applications in cold climate...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28646778/the-hydrological-functioning-of-a-constructed-fen-wetland-watershed
#3
Scott J Ketcheson, Jonathan S Price, Owen Sutton, George Sutherland, Eric Kessel, Richard M Petrone
Mine reclamation requires the reconstruction of entire landforms and drainage systems. The hydrological regime of reclaimed landscapes will be a manifestation of the processes operating within the individual landforms that comprise it. Hydrology is the most important process regulating wetland function and development, via strong controls on chemical and biotic processes. Accordingly, this research addresses the growing and immediate need to understand the hydrological processes that operate within reconstructed landscapes following resource extraction...
June 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28646776/characterizing-the-pahs-in-surface-waters-and-snow-in-the-athabasca-region-implications-for-identifying-hydrological-pathways-of-atmospheric-deposition
#4
S J Birks, S Cho, E Taylor, Y Yi, J J Gibson
The composition of polycyclic aromatic hydrocarbons present in snow and surface waters in the Athabasca Oil Sands Region (AOSR) was characterized in order to identify major contributors to the organics detected in rivers and lakes in the region. PAH concentrations, measured by three monitoring programs in 2011, were used to compare the PAH compositions of snow and surface waters across the AOSR. The 2011 dataset includes total (dissolved+particulate) concentrations of thirty-four parent and alkylated PAH compounds in 105 snow, 272 river, and 3 lake samples...
June 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28646571/comparison-of-reed-water-lettuce-in-constructed-wetland-for-sewage-water-treatment
#5
Abdullah Yasar, Ayesha Zaheer, Amtul Bari Tabinda, Marryam Khan Yusra Mahfooz
In the present study two designs Vertical and Horizontal system were used and two different plant species, water lettuce (Pistia stratiotes) and reed plant (Phragmites karka) were compared for their removal efficiency. Vertical system appeared to be more stable and efficient for almost all the parameters. Vertical planted with water lettuce showed % removal efficiency for BOD, phosphate and chloride as 82, 95.4 and 51 respectively while turbidity and total suspended solids (TSS) removal efficiency was almost same...
June 21, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28646313/domestic-wastewater-treatment-by-constructed-wetlands-enhanced-with-bioremediating-rhizobacteria
#6
Irina Salgado, Herlen Cárcamo, María Elena Carballo, Mario Cruz, María Del Carmen Durán
Constructed wetlands (CWs) offer several advantages for treating waters; however, the successful application of these systems remains a challenge. Practical solutions to pollution through CWs remain incipient because wetlands are still studied as "black boxes"; further studies are required regarding the involvement of rhizosphere bacteria in the removal of pollutants. This research focused on increasing the performance of CWs treatment systems for the removal of inorganic and organic pollutants from domestic wastewater, by the application of native bioremediating rhizobacteria...
June 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28644715/biological-responses-of-the-american-coot-fulica-americana-in-wetlands-with-contrasting-environmental-conditions-basin-of-m%C3%A3-xico
#7
María Eugenia López-Islas, Itzel Ibarra-Meza, Esperanza Ortiz-Ordóñez, Liliana Favari, J Elías Sedeño-Díaz, Eugenia López-López
Wetland ecosystems are subject to severe impacts (physical and chemical) and to the input of various xenobiotics that provoke toxicological consequences. Waterbirds are potential sentinel species of these environments. To analyze how habitat conditions affect the health of Fulica americana, early-warning biomarkers, histopathology, somatic indices, and water quality were examined in two wetlands of the Basin of Mexico: Xochimilco, an urban wetland highly eutrophic with a mixture of pollutants, and Tecocomulco (the reference site), a rural wetland with hunting migratory birds in winter, and with some agricultural contaminants...
June 23, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28641229/effects-of-short-term-invasion-of-spartina-alterniflora-and-the-subsequent-restoration-of-native-mangroves-on-the-soil-organic-carbon-nitrogen-and-phosphorus-stock
#8
Jianxiang Feng, Jian Zhou, Liming Wang, Xiaowei Cui, Cunxin Ning, Hao Wu, Xiaoshan Zhu, Guanghui Lin
The exotic cordgrass Spartina alterniflora has severely invaded the mangrove wetlands in southern China and ecological restoration using native mangroves was conducted in an attempt to control this invasive species. In this study, the contents and pools of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) were quantified to investigate the invasive effects of S. alterniflora and then to evaluate whether the ecological restoration of native mangrove could reverse those effects. S. alterniflora only showed significantly higher organic carbon content in the surface 0-10 cm of soil than in the uninvaded mudflat...
June 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28639021/evapotranspiration-versus-oxygen-intrusion-which-is-the-main-force-in-alleviating-bioclogging-of-vertical-flow-constructed-wetlands-during-a-resting-operation
#9
Guofen Hua, Qiuwen Chen, Jun Kong, Man Li
Clogging is the most significant challenge limiting the application of constructed wetlands. Application of a forced resting period is a practical way to relieve clogging, particularly bioclogging. To reveal the alleviation mechanisms behind such a resting operation, evapotranspiration and oxygen flux were studied during a resting period in a laboratory vertical-flow constructed wetland model through physical simulation and numerical model analysis. In addition, the optimum theoretical resting duration was determined based on the time required for oxygen to completely fill the pores, i...
June 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28634416/new-climatic-targets-against-global-warming-will-the-maximum-2%C3%A2-%C3%A2-c-temperature-rise-affect-estuarine-benthic-communities
#10
Daniel Crespo, Tiago Fernandes Grilo, Joana Baptista, João Pedro Coelho, Ana Isabel Lillebø, Fernanda Cássio, Isabel Fernandes, Cláudia Pascoal, Miguel Ângelo Pardal, Marina Dolbeth
The Paris Agreement signed by 195 countries in 2015 sets out a global action plan to avoid dangerous climate change by limiting global warming to remain below 2 °C. Under that premise, in situ experiments were run to test the effects of 2 °C temperature increase on the benthic communities in a seagrass bed and adjacent bare sediment, from a temperate European estuary. Temperature was artificially increased in situ and diversity and ecosystem functioning components measured after 10 and 30 days. Despite some warmness effects on the analysed components, significant impacts were not verified on macro and microfauna structure, bioturbation or in the fluxes of nutrients...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28629102/bioelectrochemical-approach-for-control-of-methane-emission-from-wetlands
#11
Shentan Liu, Xiaojuan Feng, Xianning Li
To harvest electricity and mitigate methane emissions from wetlands, a novel microbial fuel cell coupled constructed wetland (MFC-CW) was assembled with an anode placing in the rhizosphere and a cathode on the water surface. Plant-mediated methane accounted for 71-82% of the total methane fluxes. The bioanode served as an inexhaustible source of electron acceptors and resulted in reduced substantial methane emissions owing to electricigens outcompeting methanogens for carbon and electrons when substrate was deficient...
June 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28626041/reply-to-yang-et-al-coastal-wetlands-are-not-well-represented-by-protected-areas-for-endangered-birds
#12
Weihua Xu, Yi Xiao, Jingjing Zhang, Wu Yang, Lu Zhang, Vanessa Hull, Zhi Wang, Hua Zheng, Jianguo Liu, Stephen Polasky, Ling Jiang, Yang Xiao, Xuewei Shi, Enming Rao, Fei Lu, Xiaoke Wang, Gretchen C Daily, Zhiyun Ouyang
No abstract text is available yet for this article.
June 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28625613/comparison-of-electrochemical-performances-and-microbial-community-structures-of-two-photosynthetic-microbial-fuel-cells
#13
Wei Zheng, Teng Cai, Manhong Huang, Donghui Chen
Microbial fuel cells (MFCs) have attracted intensive interest for their power generation and pollutants removal characteristics. Electrochemical performances and community structures of two algae cathode photosynthetic MFCs were investigated and compared. Microbial consortia of these two MFCs were taken from wetland sediment (named SMFC) and an up-flow anaerobic wastewater treatment reactor (named UMFC). Maximum power density of the SMFC and UMFC achieved 202.9 ± 18.1 mW/m(2) and 158.2±15.1 mW/m(2), respectively...
June 15, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28623505/assessment-of-arsenic-content-in-soil-rice-grains-and-groundwater-and-associated-health-risks-in-human-population-from-ropar-wetland-india-and-its-vicinity
#14
Sakshi Sharma, Inderpreet Kaur, Avinash Kaur Nagpal
In the present study, potential health risks posed to human population from Ropar wetland and its vicinity, by consumption of inorganic arsenic (i-As) via arsenic contaminated rice grains and groundwater, were assessed. Total arsenic (t-As) in soil and rice grains were found in the range of 0.06-0.11 mg/kg and 0.03-0.33 mg/kg, respectively, on dry weight basis. Total arsenic in groundwater was in the range of 2.31-15.91 μg/L. i-As was calculated from t-As using relevant conversion factors. Rice plants were found to be arsenic accumulators as bioconcentration factor (BCF) was observed to be >1 in 75% of rice grain samples...
June 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28621547/endophytic-bacteria-enhance-remediation-of-tannery-effluent-in-constructed-wetlands-vegetated-with-leptochloa-fusca
#15
Sobia Ashraf, Muhammad Afzal, Muhammad Naveed, Muhammad Shahid, Zahir Ahmad Zahir
The use of constructed wetlands (CWs) is a promising approach for the remediation of wastewater. The present study aims to develop a plant-bacterial system within CWs for efficient remediation of tannery effluent. In a vertical flow CW vegetated with Leptochloa fusca (Kallar grass), a consortium of three different endophytic bacteria, Pantoea stewartii ASI11, Microbacterium arborescens HU33, and Enterobacter sp. HU38, was used for bioaugmentation. Constructed wetlands vegetated with only L. fusca had the potential to remediate tannery effluent, but augmentation with endophytic bacteria enhanced the growth of L...
June 16, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28619793/draft-genome-sequence-of-methylocapsa-palsarum-ne2-t-an-obligate-methanotroph-from-subarctic-soil
#16
Kirill K Miroshnikov, Alena Didriksen, Daniil G Naumoff, Marcel Huntemann, Alicia Clum, Manoj Pillay, Krishnaveni Palaniappan, Neha Varghese, Natalia Mikhailova, Supratim Mukherjee, T B K Reddy, Chris Daum, Nicole Shapiro, Natalia Ivanova, Nikos Kyrpides, Tanja Woyke, Svetlana N Dedysh, Mette M Svenning
Methylocapsa palsarum NE2(T) is an aerobic, mildly acidophilic, obligate methanotroph. Similar to other Methylocapsa species, it possesses only a particulate methane monooxygenase and is capable of atmospheric nitrogen fixation. The genome sequence of this typical inhabitant of subarctic wetlands and soils also contains genes indicative of aerobic anoxygenic photosynthesis.
June 15, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28617523/electrochemical-characterization-of-geobacter-lovleyi-identifies-limitations-of-microbial-fuel-cell-performance-in-constructed-wetlands
#17
Clara Corbella, Rebecca P Steidl, Jaume Puigagut, Gemma Reguera
Power generation in microbial fuel cells implemented in constructed wetlands (CW-MFCs) is low despite the enrichment of anode electricigens most closely related to Geobacter lovleyi. Using the model representative G. lovleyi strain SZ, we show that acetate, but not formate or lactate, can be oxidized efficiently but growth is limited by the high sensitivity of the bacterium to oxygen. Acetate and highly reducing conditions also supported the growth of anode biofilms but only at optimal anode potentials (450 mV vs...
June 2017: International Microbiology: the Official Journal of the Spanish Society for Microbiology
https://www.readbyqxmd.com/read/28617290/micro-zooplankton-grazing-as-a-means-of-fecal-bacteria-removal-in-stormwater-bmps
#18
Jade M Burtchett, Michael A Mallin, Lawrence B Cahoon
A priority for environmental managers is control of stormwater runoff pollution, especially fecal microbial pollution. This research was designed to determine if fecal bacterial grazing by micro-zooplankton is a significant control on fecal bacteria in aquatic best management practices (BMPs); if grazing differs between a wet detention pond and a constructed wetland; and if environmental factors enhance grazing. Both 3-day grazing tests and 24-h dilution assays were used to determine grazing differences between the two types of BMP...
June 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28617286/improving-the-microbiological-quality-of-the-ruhr-river-near-essen-comparing-costs-and-effects-for-the-reduction-of-escherichia-coli-and-intestinal-enterococci
#19
Katharina Tondera, Kassandra Klaer, Silke Roder, Ira Brueckner, Johannes Pinnekamp
After rain events in densely populated areas, combined sewer overflows (CSOs) can have severe health-related effects upon surface water quality, as well as diffuse overland runoff and wastewater treatment plants (WWTPs). All of these sources emit pathogens and fecal indicator bacteria into the surface water, which the EU Bathing Water Directive addresses by giving threshold values for the indicators Escherichia coli and intestinal enterococci. This study presents a comparison between 21 scenarios of costs for processes that reduce the load of Escherichia coli and intestinal enterococci into the Ruhr River during and shortly after rain events...
June 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28617285/assessment-of-the-technological-reliability-of-a-hybrid-constructed-wetland-for-wastewater-treatment-in-a-mountain-eco-tourist-farm-in-poland
#20
Andrzej Jucherski, Maria Nastawny, Andrzej Walczowski, Krzysztof Jóźwiakowski, Magdalena Gajewska
The aim of the present study was to assess the technological reliability of a domestic hybrid wastewater treatment installation consisting of a classic three-chambered (volume 6 m(3)) septic tank, a vertical flow trickling bed filled with granules of a calcinated clay material (KERAMZYT), a special wetland bed constructed on a slope, and a permeable pond used as a receiver. The test treatment plant was located at a mountain eco-tourist farm on the periphery of the spa municipality of Krynica-Zdrój, Poland...
June 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
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