Evaluation of laboratory-scale in situ capping sediments with purple parent rock to control the eutrophication

2017 ◽  
Vol 24 (8) ◽  
pp. 7114-7123 ◽  
Author(s):  
Xuejiao Huang ◽  
Wenhao Shi ◽  
Jiupai Ni ◽  
Zhenlun Li
2013 ◽  
Vol 11 (4) ◽  
pp. 629-635 ◽  
Author(s):  
L. M. Schaefer ◽  
V. S. Brözel ◽  
S. N. Venter

Investigations were carried out to evaluate and quantify colonization of laboratory-scale drinking water biofilms by a chromosomally green fluorescent protein (gfp)-tagged strain of Salmonella Typhimurium. Gfp encodes the green fluorescent protein and thus allows in situ detection of undisturbed cells and is ideally suited for monitoring Salmonella in biofilms. The fate and persistence of non-typhoidal Salmonella in simulated drinking water biofilms was investigated. The ability of Salmonella to form biofilms in monoculture and the fate and persistence of Salmonella in a mixed aquatic biofilm was examined. In monoculture S. Typhimurium formed loosely structured biofilms. Salmonella colonized established multi-species drinking water biofilms within 24 hours, forming micro-colonies within the biofilm. S. Typhimurium was also released at high levels from the drinking water-associated biofilm into the water passing through the system. This indicated that Salmonella could enter into, survive and grow within, and be released from a drinking water biofilm. The ability of Salmonella to survive and persist in a drinking water biofilm, and be released at high levels into the flow for recolonization elsewhere, indicates the potential for a persistent health risk to consumers once a network becomes contaminated with this bacterium.


2014 ◽  
Vol 53 (51) ◽  
pp. 14153-14157 ◽  
Author(s):  
Johann H. Sattler ◽  
Michael Fuchs ◽  
Francesco G. Mutti ◽  
Barbara Grischek ◽  
Philip Engel ◽  
...  
Keyword(s):  

2021 ◽  
Author(s):  
Alexey V. Vakhin ◽  
Irek I. Mukhamatdinov ◽  
Firdavs A. Aliev ◽  
Dmitriy F. Feoktistov ◽  
Sergey A. Sitnov ◽  
...  

Abstract A nickel-based catalyst precursor has been synthesized for in-situ upgrading of heavy crude oil that is capable of increasing the efficiency of steam stimulation techniques. The precursor activation occurs due to the decomposition of nickel tallate under hydrothermal conditions. The aim of this study is to analyze the efficiency of in-situ catalytic upgrading of heavy oil from laboratory scale experiments to the field-scale implementation in Boca de Jaruco reservoir. The proposed catalytic composition for in-reservoir chemical transformation of heavy oil and natural bitumen is composed of oil-soluble nickel compound and organic hydrogen donor solvent. The nickel-based catalytic composition in laboratory-scale hydrothermal conditions at 300°С and 90 bars demonstrated a high performance; the content of asphaltenes was reduced from 22% to 7 wt.%. The viscosity of crude oil was also reduced by three times. The technology for industrial-scale production of catalyst precursor was designed and the first pilot batch with a mass of 12 ton was achieved. A «Cyclic steam stimulation» technology was modified in order to deliver the catalytic composition to the pay zones of Boca de Jaruco reservoir (Cuba). The active forms of catalyst precursors are nanodispersed mixed oxides and sulfides of nickel. The pilot test of catalyst injection was carried out in bituminous carbonate formation M, in Boca de Jaruco reservoir (Cuba). The application of catalytic composition provided increase in cumulative oil production and incremental oil recovery in contrast to the previous cycle (without catalyst) is 170% up to date (the effect is in progress). After injection of catalysts, more than 200 samples from production well were analyzed in laboratory. Based on the physical and chemical properties of investigated samples and considering the excellent oil recovery coefficient it is decided to expand the industrial application of catalysts in the given reservoir. The project is scheduled on the fourth quarter of 2021.


2012 ◽  
Vol 438 ◽  
pp. 334-341 ◽  
Author(s):  
Di Xu ◽  
Shiming Ding ◽  
Qin Sun ◽  
Jicheng Zhong ◽  
Wei Wu ◽  
...  

Cryogenics ◽  
1984 ◽  
Vol 24 (4) ◽  
pp. 171-174 ◽  
Author(s):  
H. LeHuy ◽  
L. Germain ◽  
R. Roberge ◽  
S. Foner
Keyword(s):  

2006 ◽  
Vol 3 (6) ◽  
pp. 13342 ◽  
Author(s):  
JT Olsta ◽  
CJ Hornaday ◽  
JW Darlington

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