Hydrogen Production by Green Alga GAF99 in Sea Water Bioreactor: II Modeling the Effect of Temperature

2012 ◽  
Vol 11 (4) ◽  
pp. 258-262 ◽  
Author(s):  
Farqad F.M. Saeed ◽  
Mohammed A. Ibrahim
Keyword(s):  
Hydrogen Production ◽  
Green Alga ◽  
Sea Water ◽  
Effect Of Temperature

HYDROGEN FROM HYDROGEN SULPHIDE IN BLACK SEA

2019 ◽  
pp. 49-55
Author(s):  
S. Z. Baykara ◽  
E. H. Figen ◽  
A. Kale ◽  
T. N. Veziroglu
Keyword(s):  
Hydrogen Production ◽  
Black Sea ◽  
Hydrogen Sulphide ◽  
Sea Water ◽  
Economic Value ◽  
Environmental Pollutant ◽  
The Black Sea ◽  
Fuel Processing ◽  
Acid Gas ◽  
Reducing Bacteria

Hydrogen sulphide, an acid gas, is generally considered an environmental pollutant. As an industrial byproduct, it is produced mostly during fuel processing. Hydrogen sulphide occurs naturally in many gas wells and also in gas hydrates and gas-saturated sediments especially at the bottom of the Black Sea where 90% of the sea water is anaerobic.The anoxic conditions exist in the deepest parts of the basin since nearly 7300 years, caused by the density stratification following the significant influx of the Mediterranean water through the Bosphorous nearly 9000 years ago. Here, H2S is believed to be produced by sulphur reducing bacteria at an approximate rate of 10 000 tons per day, and it poses a serious threat since it keeps reducing the life in the Black Sea. An oxygen–hydrogen sulphide interface is established at 150–200 m below the surface after which H2S concentration starts increasing regularly until 1000 m, and finally reaches a nearly constant value of 9.5 mg/l around 1500 m depth.Hydrogen sulphide potentially has economic value if both sulphur and hydrogen can be recovered. Several methods are studied for H2S decomposition, including thermal, thermochemical, electrochemical, photochemical and plasmochemical methods.In the present work, H2S potential in the Black Sea is investigated as a source of hydrogen, an evaluation of the developing prominent techniques for hydrogen production from H2S is made, and an engineering assessment is carried out regarding hydrogen production from H2S in the Black Sea using a process design based on the catalytic solar thermolysis approach. Possibility of a modular plant is considered for production at larger scale.

scholarly journals CHARACTERISTICS OF UHF WAVES DISTRIBUTION IN LAND AND WATER SURFACE TROPOSPHERIC WAVEGUIDE

2019 ◽  
pp. 115-121
Author(s):  
Oxana Vladimirovna Kalambatskaya ◽  
Oleg Nickolaevich Pishchin
Keyword(s):  
Communication Systems ◽  
Water Surface ◽  
Sea Water ◽  
Systems Design ◽  
Cellular Communication ◽  
Effect Of Temperature ◽  
Radio Waves ◽  
Wave Direction ◽  
Surface Atmospheric Layer ◽  
Cellular Communication Systems

The article considers examples of ultra-long propagation of UHF radio waves in mobile cellular communication systems. The phenomena are mainly observed in the Astrakhan region in the spring-summer period (May-June) and are presumably associated with sharp seasonal changes of air temperature followed by rains. The effect of temperature inversion results in changing the refraction index in the surface layer and, as a result, in changing the wave direction as the effect of superrefraction in the surface atmospheric layer. The properties of radio waves in their propagation in the land and sea-water surface waveguide are investigated. The values of the heights of land and sea-water surface tropospheric waveguides for cellular communication systems of different ranges are obtained. The features of existing of tropospheric land and sea-water surface tropospheric waveguides are described. The need to use their properties in the mobile communication systems design is stated.

Laboratory Investigation of Current Distribution On Brass Tube Plates and Tube Ends of Condensers Using Sea Water

CORROSION ◽  
1961 ◽  
Vol 17 (1) ◽  
pp. 8t-10t ◽  
Author(s):  
P. G. ATTWOOD ◽  
W. G. RICHARDS
Keyword(s):  
Current Distribution ◽  
Sea Water ◽  
Effect Of Temperature ◽  
Zinc Alloy ◽  
Tube Sheet ◽  
Condenser Tube ◽  
Galvanic Current ◽  
Brass Tube ◽  
Dynamic Experiments ◽  
Velocity Effect

Abstract Static and dynamic experiments were made on brass tube plates and tube ends of condensers to determine the current distribution on them in sea water. Factors evaluated in this connection include effect of water velocity, effect of coatings, effect of temperature, and effect of composition of the anode and tube materials. It was found that most of the galvanic current flowing from ferrous components (or a steel anode) to a non-ferrous condenser tube sheet flowed to the tubes with only a small proportion going to the tube plate. A zinc alloy anode provided a much higher current than a steel anode to both an Admiralty brass tube and an aluminum brass tube. 7.4.2, 3.6.6, 4.6.11, 5.2.1

Enhanced hydrogen production by optimization of immobilized cells of the green alga Tetraspora sp. CU2551 grown under anaerobic condition

2018 ◽  
Vol 111 ◽  
pp. 88-95 ◽  
Author(s):  
Thanaporn Maswanna ◽  
Saranya Phunpruch ◽  
Peter Lindblad ◽  
Cherdsak Maneeruttanarungroj
Keyword(s):  
Hydrogen Production ◽  
Green Alga ◽  
Anaerobic Condition ◽  
Immobilized Cells

Light-Dependent Hydrogen Production of the Green Alga Scenedesmus obliquus

BioHydrogen ◽  
2007 ◽  
pp. 243-251
Author(s):  
Rüdiger Schulz ◽  
Jörg Schnackenberg ◽  
Kerstin Stangier ◽  
Röbbe Wünschiers ◽  
Thomas Zinn ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Green Alga ◽  
Scenedesmus Obliquus

Hydrogen production by a green alga,Chlamydomonas reinhardtii, in an alternating light/dark cycle

1982 ◽  
Vol 24 (7) ◽  
pp. 1555-1563 ◽  
Author(s):  
Yoshiharu Miura ◽  
Kiyohito Yagi ◽  
Mitsuru Shoga ◽  
Kazushisa Miyamoto
Keyword(s):  
Hydrogen Production ◽  
Chlamydomonas Reinhardtii ◽  
Green Alga ◽  
Dark Cycle
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