scholarly journals Kinetic Modeling of Phosphate Adsorption by Preformed and In situ formed Hydrous Ferric Oxides at Circumneutral pH

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Yanpeng Mao ◽  
Qinyan Yue
Keyword(s):  
Kinetic Modeling ◽  
Phosphate Adsorption ◽  
Hydrous Ferric Oxides ◽  
Ferric Oxides ◽  
Circumneutral Ph

Study on the effects of soluble microbial product on phosphate adsorption onto fresh hydrous ferric oxides by surface complexation models

2016 ◽  
Vol 74 (10) ◽  
pp. 2446-2453 ◽  
Author(s):  
Yanpeng Mao ◽  
Wenlong Wang ◽  
Chunyuan Ma
Keyword(s):  
Equilibrium Constants ◽  
Surface Complexation ◽  
Phosphate Adsorption ◽  
Stable Operation ◽  
Microbial Product ◽  
Music Model ◽  
Soluble Microbial Product ◽  
Hydrous Ferric Oxides ◽  
Ferric Oxides ◽  
Complexation Reactions

As one of the major soluble organic compounds in membrane bioreactors, soluble microbial product (SMP) can combine the surface sites on hydrous ferric oxides (HFO), which can compete with HFO for the uptake of phosphate. In this study, SMP was extracted from an MBR plant with long-term stable operation, and the effects of SMP on phosphate adsorption onto fresh HFO (FHFO) were investigated at pH values of 6.0 and 7.8 in a two-phase system composed of FHFO (solid phase) and SMP/phosphate (liquid phase). The phosphate adsorption capacity of FHFO was found to decrease significantly with increase in the pH value and SMP concentration. A diffuse layer model (DLM) and a charge distribution multisite complexation (CD-MUSIC) model, which take these factors into account, were developed to describe the speciation of SMP and phosphate on FHFO surface. Both of the models provided good description of phosphate adsorption behavior in the presence of SMP at different pH. The equilibrium constants of surface complexation reactions between SMP and HFO were obtained by inversion calculation as log10K = 15.1 ± 0.11 in DLM model and log10K = 12.1 ± 0.5 in CD-MUSIC model, which can improve the equilibrium constants database of surface complexation models.

scholarly journals Hydrous Ferric Oxides in Sediment Catalyze Formation of Reactive Oxygen Species during Sulfide Oxidation

2016 ◽  
Vol 3 ◽  
Author(s):  
Sarah A. Murphy ◽  
Shengnan Meng ◽  
Benson M. Solomon ◽  
Dewamunnage M. C. Dias ◽  
Timothy J. Shaw ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Sulfide Oxidation ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Hydrous Ferric Oxides ◽  
Ferric Oxides

Kinetic Modeling of the In-situ Combustion Process for Athabasca Oil Sands

2014 ◽  
Author(s):  
Xiaolin Chen ◽  
Zhangxin (John) Chen ◽  
Robert Gordon Moore ◽  
Sudarshan A. Mehta ◽  
Matthew G. Ursenbach ◽  
...  
Keyword(s):  
Kinetic Modeling ◽  
Oil Sands ◽  
Combustion Process ◽  
Athabasca Oil Sands ◽  
In Situ Combustion

Surface and Textural Heterogeneity of Fresh Hydrous Ferric Oxides in Water and in the Dry State

1993 ◽  
Vol 159 (1) ◽  
pp. 45-52 ◽  
Author(s):  
J.Y. Bottero ◽  
M. Arnaud ◽  
F. Villiéras ◽  
L.J. Michot ◽  
P. de Donato ◽  
...  
Keyword(s):  
Hydrous Ferric Oxides ◽  
Ferric Oxides

Rare earth element partitioning between hydrous ferric oxides and acid mine water during iron oxidation

2004 ◽  
Vol 19 (8) ◽  
pp. 1339-1354 ◽  
Author(s):  
Philip L. Verplanck ◽  
D.Kirk Nordstrom ◽  
Howard E. Taylor ◽  
Briant A. Kimball
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Mine Water ◽  
Earth Element ◽  
Iron Oxidation ◽  
Acid Mine Water ◽  
Acid Mine ◽  
Element Partitioning ◽  
Hydrous Ferric Oxides ◽  
Ferric Oxides
Sign in / Sign up

Export Citation Format

Share Document