scholarly journals Supplementary material to "Kinetics of calcite precipitation by ureolytic bacteria under aerobic and anaerobic conditions"

2018 ◽  
Author(s):  
Andrew C. Mitchell ◽  
Erika J. Espinosa-Ortiz ◽  
Stacy L. Parks ◽  
Adrienne Phillips ◽  
Alfred B. Cunningham ◽  
...  
Keyword(s):  
Anaerobic Conditions ◽  
Calcite Precipitation ◽  
Supplementary Material ◽  
Kinetics Of ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions ◽  
Ureolytic Bacteria

Evaluation of state variable interface between the Activated Sludge Models and Anaerobic Digestion Model no 1

2008 ◽  
Vol 57 (6) ◽  
pp. 901-907 ◽  
Author(s):  
H. Yasui ◽  
K. Komatsu ◽  
R. Goel ◽  
Y. Y. Li ◽  
T. Noike
Keyword(s):  
Activated Sludge ◽  
State Of The Art ◽  
Degradation Kinetics ◽  
The State ◽  
State Variables ◽  
Anaerobic Conditions ◽  
State Variable ◽  
Kinetics Of ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions

For plant wide modelling of wastewater treatment, it is necessary to develop a suitable state variables interface for integrating state of the art models of ASM and ADM1. ADM1 currently describes such an interface, however, its suitability needs to be experimentally evaluated. In this study, we characterised activated sludge under aerobic and anaerobic conditions to obtain representative state variables for both models. ASM state variables of XS, XH and XI (as obtained from aerobic tests) and ADM1 state variables of XC and XI (as obtained from anaerobic tests) were then correlated to assess the suitability of current interface. Based on the seven datasets of this study and seven datasets from literatures, it was found that in general ASM state variables were well correlated to the state variables of ADM1. The ADM1 state variable of XC could be correlated to the sum of state variables of XS and XH, while XI in both the models showed direct correspondence. It was also observed that the degradation kinetics of XC under anaerobic condition could be better described by individual degradation kinetics of XS and XH. Therefore, to establish a one to one correspondence between ASM and ADM1 state variables and better description of degradation kinetics in ADM1, replacing the composite variable of XC by the state variables of XS and XH is recommended.

Effect of pH, Buffer, and Viscosity on the Photolysis of Formylmethylflavin: A Kinetic Study

2013 ◽  
Vol 66 (5) ◽  
pp. 579 ◽  
Author(s):  
Iqbal Ahmad ◽  
Tania Mirza ◽  
Kefi Iqbal ◽  
Sofia Ahmed ◽  
Muhammad Ali Sheraz ◽  
...  
Keyword(s):  
Rate Constants ◽  
Anaerobic Conditions ◽  
First Order ◽  
Phosphate Ions ◽  
First Order Kinetics ◽  
Ph Buffer ◽  
Ph Range ◽  
Kinetics Of ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions

The kinetics of the photolysis of formylmethylflavin, a major intermediate product in the aerobic and anaerobic photolysis of riboflavin, was studied in the pH range 2.0–11.0. Formylmethylflavin and its photoproducts, lumichrome and lumiflavin, were determined in degraded solutions using a specific multicomponent spectrophotometric method. The photolysis of formylmethylflavin in alkaline medium takes place by first-order kinetics and the rate constants (kobs) at pH 7.5–11.0 range from 0.27 × 10–4 to 3.88 × 10–4 and 0.36 × 10–4 to 5.63 × 10–4 s–1 under aerobic and anaerobic conditions respectively. In acid medium, the photolysis involves a second-order mechanism and the rate constants at pH 2.0–7.0 range from 1.37 to 2.11 and 2.03 to 2.94 M–1 s–1 under aerobic and anaerobic conditions respectively. The rate–pH profiles for the photolysis reactions indicate the highest rate of formylmethylflavin degradation is at ~pH 4 and above pH 10. In the alkaline region, the increase in rate with pH is due to higher reactivity of the flavin triplet state. The photolysis of formylmethylflavin is catalyzed by phosphate ions and is affected by the solvent viscosity.

Reduction rate of neptunium(V) in heterogeneous solution with magnetite

2004 ◽  
Vol 92 (3) ◽  
Author(s):  
K. Nakata ◽  
S. Nagasaki ◽  
S. Tanaka ◽  
Y. Sakamoto ◽  
T. Tanaka ◽  
...  
Keyword(s):  
Reduction Rate ◽  
Sorption Kinetics ◽  
Anaerobic Conditions ◽  
Kinetics Of ◽  
Aerobic And Anaerobic ◽  
Aerobic And Anaerobic Conditions

SummaryThe sorption kinetics of neptunium on magnetite was investigated under both aerobic and anaerobic conditions in 0.1mol L

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