نتایج جستجو برای: sediment injection

تعداد نتایج: 194023  

Journal: :Applied and environmental microbiology 2005
Helen A Vrionis Robert T Anderson Irene Ortiz-Bernad Kathleen R O'Neill Charles T Resch Aaron D Peacock Richard Dayvault David C White Philip E Long Derek R Lovley

The geochemistry and microbiology of a uranium-contaminated subsurface environment that had undergone two seasons of acetate addition to stimulate microbial U(VI) reduction was examined. There were distinct horizontal and vertical geochemical gradients that could be attributed in large part to the manner in which acetate was distributed in the aquifer, with more reduction of Fe(III) and sulfate...

2017
Christine N. Shulse Brianne Maillot Craig R. Smith Matthew J. Church

Concentrated seabed deposits of polymetallic nodules, which are rich in economically valuable metals (e.g., copper, nickel, cobalt, manganese), occur over vast areas of the abyssal Pacific Ocean floor. Little is currently known about the diversity of microorganisms inhabiting abyssal habitats. In this study, sediment, nodule, and water column samples were collected from the Clarion-Clipperton Z...

Journal: :Journal of contaminant hydrology 2006
Lonnie G Kennedy Jess W Everett Erica Becvar Donald DeFeo

Biogeochemical reductive dechlorination (BiRD) is a new remediation approach for chlorinated aliphatic hydrocarbons (CAHs). The approach stimulates common sulfate-reducing soil bacteria, facilitating the geochemical conversion of native iron minerals into iron sulfides. Iron sulfides have the ability to chemically reduce many common CAH compounds including PCE, TCE, DCE, similar to zero valent ...

Journal: :Engineering Applications of Computational Fluid Mechanics 2021

Rivers in the north-western region of China have a high sediment content, and construction reservoirs on these rivers must address problem sedimentation that results loss reservoir capacity. In this study, YZD (Yazidang) was considered as typical case, to injection-type water supply Northwest China. The temporal spatial characteristics diversion project were analyzed based available 46-year dat...

2012
Marko Reinikainen Emma Åhlén

The hatching of cladoceran ephippia from a 15-cm long sediment core was investigated, and Ceriodaphnia quadrangula clones were isolated from different sediment layers. Bosmina microfossil data were also analyzed, and compared with the corresponding data from a Pb210 dated core, which allowed us to infer the age of the sediment layers. Using changes in Bosmina microfossil morphologies, we were, ...

2016
Ramazan Manav Aysun Uğur Görgün Işık Filizok

The pollution level of Lake Bafa was investigated by collecting fish samples {Dicentrarchus labrax (sea bass), Liza ramada (mullet) and Anguilla anguilla (eel)}, surface sediment, and core samples. In all these samples, 210Po and 210Pb concentrations were estimated, and total annual dose rates were obtained for each species. Some heavy metal (Cr, Ni, Pb, Cd, Mn, Fe, and Zn) concentration levels...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 0

a semi-empirical mathematical model for predicting physical part of ignition delay period in the combustion of direct - injection diesel engines with swirl is developed . this model based on a single droplet evaporation model . the governing equations , namely , equations of droplet motion , heat and mass transfer were solved simultaneously using a rung-kutta step by step unmerical method . the...

2013
Erini Yuwatini Noriko Hata Hideki Kuramitz Shigeru Taguchi

A higher enrichment of organic pollutant, di(2-ethylhexyl) phthalate (DEHP) was found in estuary of Oyabe River and Jinzu River, Japan. Based on this, the distribution of DEHP between water and bed sediment was investigated as a model of organic pollutant through both the field investigation and laboratory experiment. The laboratory experiment was performed to examine the effect of seawater, or...

Journal: :Chemosphere 2013
Ximei Liang Baowei Chen Xiangping Nie Zhen Shi Xiaoping Huang Xiangdong Li

Antibiotics released into the aquatic environment play an important role in the spread of antibiotic resistance. In the Pearl River Estuary (PRE) and the coastal zone, the concentrations of antibiotics decreased from the Pearl River to the estuary, suggesting that antibiotics primarily originated from river tributaries and terrigenous sources. Within the PRE area, the concentrations of antibiot...

Journal: :Environmental pollution 2015
Cameron G J Hoggarth Britt D Hall Carl P J Mitchell

Using enriched stable (201)Hg injections into intact sediment cores, we provide the first reported Hg methylation potential rate constants (km) in prairie wetland ponds (0.016-0.17 d(-1)). Our km values were similar to other freshwater wetlands and did not differ in ponds categorized with high compared to low surface water concentrations of sulphate. Sites with high sulphate had higher proporti...

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