Free Water Content and Sludge Retention Time: Impact on Oxygen Transfer in Activated Sludge

2009 ◽  
Vol 43 (22) ◽  
pp. 8561-8565 ◽  
Author(s):  
Jochen Henkel ◽  
Peter Cornel ◽  
Martin Wagner
Keyword(s):  
Activated Sludge ◽  
Water Content ◽  
Retention Time ◽  
Oxygen Transfer ◽  
Free Water ◽  
Sludge Retention Time ◽  
Free Water Content

Fermentation Problem in Spanish North-Coast Honey

1995 ◽  
Vol 58 (5) ◽  
pp. 515-518 ◽  
Author(s):  
SUSANA SANZ ◽  
GLORIA GRADILLAS ◽  
FUENCISLA JIMENO ◽  
CONSUELO PEREZ ◽  
TERESA JUAN
Keyword(s):  
Water Content ◽  
Water Activity ◽  
Microbiological Quality ◽  
Free Water ◽  
High Water ◽  
North Coast ◽  
High Water Content ◽  
Free Water Content ◽  
Cantabrian Coast ◽  
Mold And Yeast

Twenty-one samples from the Cantabrian coast were analyzed to establish their microbiological quality and fermentation tendency. In a food with a very low free-water content like honey, microbiological growth is only possible when there is an increase in water activity. Since most of the samples studied were not extensively granulated, the risk of fermentation is mostly due to high water content. Among our samples, only two had a water content below 17.1% (no risk of fermentation), whereas the high water activity of the rest of the samples indicates the possibility of microbial growth. In fact, four of the samples analyzed showed a moisture content over the Spanish maximum legal limit, which means a high risk of fermentation. The absence of Enterobacteriaceae, coliforms, and Escherichia coli in our samples indicates an appropriate cleanliness during extractions and handling of honey. No Salmonella or Shigella were found. The relationship between water activity and mold and yeast counts found for the honeys analyzed allowed us to divide our samples in two groups: honeys with a high or a low risk of fermentation. Changes observed during storage of the samples confirmed this classification.

Short-Term Snow Melt and Ablation Derived from Heat- and Mass-Balance Measurements

1973 ◽  
Vol 12 (65) ◽  
pp. 275-289 ◽  
Author(s):  
Paul M. B. Föhn
Keyword(s):  
Mass Balance ◽  
Water Content ◽  
Free Water ◽  
Liquid Water Content ◽  
Snow Melt ◽  
Snow Pack ◽  
Density Profiles ◽  
Run Off ◽  
Free Water Content ◽  
Meteorological Observations

AbstractThe daily snow melt calculated from meteorological observations is compared with detailed mass-balance measurements taking into account internal changes in density and free water content in the surface layers of a glacier snow-pack. The energy balance is calculated from measurements obtained by a meteorological station at the experimental site. In addition to the standard ablation measurements the run-off from the melting snow-pack was obtained for a few days. The snow-density profiles were measured with a portable gamma-transmission probe and the liquid-water content of snow was determined by a calorimetric method.Agreement between the melt calculated by the heat-balance method and the mass changes observed in the mass-balance measurements is fair for daily periods. It appears that about 20% of the daily snow melt takes place internally as a result of penetration of solar radiation.

Removal of selected endocrine disrupters in activated sludge systems: Effect of sludge retention time on their sorption and biodegradation

2010 ◽  
Vol 101 (7) ◽  
pp. 2090-2095 ◽  
Author(s):  
Athanasios S. Stasinakis ◽  
Constantinos I. Kordoutis ◽  
Vasiliki C. Tsiouma ◽  
Georgia Gatidou ◽  
Nikolaos S. Thomaidis
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Endocrine Disrupters ◽  
Sludge Retention Time ◽  
Activated Sludge Systems

Infrared Measurement Of Free-Water Content And Grain Size Of Snow

1987 ◽  
Vol 26 (4) ◽  
pp. 264342 ◽  
Author(s):  
T. Hyvarinen ◽  
J. Lammasniemi
Keyword(s):  
Grain Size ◽  
Water Content ◽  
Free Water ◽  
Free Water Content ◽  
Infrared Measurement

scholarly journals Investigations of internal structure and transformational processes from firn to ice in a perennial snow patch

1993 ◽  
Vol 18 ◽  
pp. 117-122 ◽  
Author(s):  
Katsuhisa Kawashima ◽  
Tomomi Yamada ◽  
Gorow Wakahama
Keyword(s):  
Water Content ◽  
Internal Structure ◽  
Formation Mechanism ◽  
Free Water ◽  
Ice Cores ◽  
Cold Wave ◽  
Mass Budget ◽  
Free Water Content ◽  
Water Saturated

To investigate the internal structure and transformational processes from firn to ice of the Hisago snow patch on Daisetsu Mountain, Hokkaido, Japan, many drillings were made during the ablation period in 1986 and 1987. The ice cores were analyzed for stratigraphy, density and free water content. The internal structure of the snow patch was characterized by a wet firn layer with abundant ice layers and ice glands overlying a 4.3 m-thick ice body. The thickness of the firn layer varied from 12.7 m in June to 1.3 m in October. A water-saturated firn layer about 1 m thick existed just above the firn-ice transition. The annual layers were identified by dirt layers which showed that 1–2 m of ice was formed each year when the mass budget was positive. Although the densification of the water-saturated firn layer proceeded rapidly, the transformation from firn to ice could not be recognized during the ablation period. It was concluded that the formation mechanism of the ice body comprised three processes: the formation of superimposed ice, the densification of a water-saturated firn layer and the freezing of wet and/or water-saturated firn by cold wave penetration.

scholarly journals Lost Circulation Effect of Bagasse, Coconut Fibers, Banana Tree Bark and Sawdust on Cement Grade G Characteristics

2018 ◽  
Vol 1 (3) ◽  
Author(s):  
Samuel Renjaan ◽  
Sugiatmo Kasmungin ◽  
Abdul Hamid
Keyword(s):  
Physical Properties ◽  
Water Content ◽  
Free Water ◽  
Tree Bark ◽  
Lost Circulation ◽  
Banana Tree ◽  
Free Water Content ◽  
Coconut Fibre ◽  
Coconut Fibers

<p>The quality of cement is very important because it will greatly help the production well activities especially to make the construction of wells can last long. In this study the influence of lost circulation material (LCM) was analyzed, such as Bagasse, Coconut Fibers, Banana Tree Bark and Sawdust on the physical properties of G-class cement such as rheology, density, free water content, thickening time, and compressive strength. This research was conducted in the laboratory by varying the percentage of LCM from 0% to 6% and temperature from 95oF to 200oF. From this research, it can be known <br />that the addition of LCM can change the physical properties of cement. The highest increase of plastic viscosity (PV) and yield point (YP) values was occurred at 6% concentration of Bagasse, Coconut Fibers, Banana Tree Bark and Sawdust that was 105 cp – 92 lbs/100ft2, 105 cp – 90 lbs/100ft2, 90 cp – 110 lbs/100ft2, and 95 cp – 110 lbs/ft2. The longest thickening time was occurred at 6% concentration of Bagasse, Coconut Fibers, Banana Tree Bark and Sawdust with a soaking temperature of 200 oF which that was 65 minutes, 60 minutes, 66 minutes, and 63 minutes. The highest reduction of density <br />value occured at 6% concentration of Bagasse, Coconut Fibers, Banana Tree Bark and Sawdust that was 15.0 ppg, 15.2 ppg, 15.2 ppg and 15.0 ppg. The decrease in the highest free water content value occurs with the addition of 6% in each type of LCM, namely 0.9 ml, 0.95 ml, 0.9 ml and 1 ml. The increase in the strong press rate occurs in the addition of 1% sugar cane, which is 2838 psi; 1% Coconut fibre is 2926 psi, 0.5% of the banana tree bark is 3080 psi and 1% of sawdust is 2728 psi all at 200 º temperature.</p>

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