Analysis of membrane fouling in the treatment of water solutions containing humic acids and mineral salts

Desalination ◽  
1999 ◽  
Vol 126 (1-3) ◽  
pp. 179-185 ◽  
Author(s):  
Małgorzata Kabsch-Korbutowicz ◽  
Katarzyna Majewska-Nowak ◽  
Tomasz Winnicki
Desalination ◽  
2005 ◽  
Vol 178 (1-3) ◽  
pp. 171-178 ◽  
Author(s):  
Zhi Wang ◽  
Yuanyuan Zhao ◽  
Jixiao Wang ◽  
Shichang Wang

1992 ◽  
Vol 38 (3) ◽  
pp. 203-208 ◽  
Author(s):  
C. Yanze Kontchou ◽  
Roland Blondeau

Biodegradation of soil humic acids by Streptomyces viridosporus ATCC 39115 growing in a mineral salts – glucose medium was demonstrated. This biodegradation accompanies bacterial growth and is, therefore, presumed to be a primary metabolic activity, but humic acids were not used as the sole source of carbon. This bacterial activity was enhanced when cells were shaken and within a pH range of 6.5–8.5. In further experiments, the relative abilities of S. viridosporus to mineralize [14C]melanoidin, used as synthetic humic acid, were also established. In contrast to the white rot fungus Phanerochaete chrysosporium, another microorganism exhibiting humic acid degrading activity at acidic pH, poor extracellular activities were found in culture medium of S. viridosporus, and veratryl alcohol does not result in increased humic acid degradation. In spite of some peroxidase activity measured in culture filtrates and analyzed by polyacrylamide gel electrophoresis, the humic acid degrading system of S. viridosporus, in these experimental conditions, seems to be cell associated. Key words: humic acid biodegradation, melanoidin mineralization, Streptomyces viridosporus, cell-bound humic acids.


1993 ◽  
Vol 39 (10) ◽  
pp. 987-989 ◽  
Author(s):  
C. Yanze Kontchou ◽  
Max Béchet ◽  
Roland Blondeau

When Streptomyces viridosporus was grown in batch culture on mineral salts – glucose medium and under oxygen, aerial mycelium formation and sporulation were suppressed. Under these conditions, biodegradation of soil or synthetic humic acids (expressed as the rate of decolorization of growth medium and the loss of radioactivity of labeled melanoidin, respectively) increased. Concurrently, both the catabolic activity of cells (expressed as peroxidase production, measured by the oxidation of N,N,N′,N′-tetramethyl-1,4-phenylenediamine as substrate) and the excretion of siderophores were stimulated.Key words: humic acid biodegradation, melanoidin mineralization, Streptomyces viridosporus, peroxidase, siderophore.


2014 ◽  
Vol 16 (3) ◽  
pp. 516-524 ◽  

<div> <p>This paper examines the effect of humic acids (HA) and other solution constituents (Ca<sup>2+</sup>, Mg<sup>2+</sup>, Na<sup>+</sup>), frequently encountered in potable water sources, on the removal of a well-known herbicide, atrazine (ATR), by a laboratory-scale pilot Photocatalytic Membrane Reactor (PMR) system. Experimental results with different HA concentrations, in the presence (or not) of background cations, demonstrate the attainment of steady-state operation with constant degradation efficiencies and controlled membrane fouling phenomena. The excellent performance of the system is attributed to the efficient photocatalytic degradation of the dissolved organics, which is enhanced by steric interactions between the HA-ATR pseudo-complexes and the membrane. The successful laboratory tests hold promise for practical water treatment applications of the proposed PMR system.</p> </div> <p>&nbsp;</p>


Desalination ◽  
2010 ◽  
Vol 264 (3) ◽  
pp. 220-227 ◽  
Author(s):  
K.S. Katsoufidou ◽  
D.C. Sioutopoulos ◽  
S.G. Yiantsios ◽  
A.J. Karabelas

2021 ◽  
Vol 447 (3) ◽  
pp. 81-86
Author(s):  
Zh.B. Rakhimberlinova ◽  
I.V. Kulakov ◽  
A.Zh. Alimzhanova ◽  
M.М. Mussirepov ◽  
N.E. Nakypbekova

This article presents the results of experimental studies of the process of grafting humic acids and their functional derivatives on modified and unmodified surfaces of burnt rock. It is shown that the inoculation of humic acids on inorganic carriers is more successful with the preliminary activation of the surface of burnt rocks. The acidic and sorption properties of grafted surfaces of humic sorbents with respect to heavy metal ions have been studied. It is shown that many of the modifying additives on the surface of the inorganic carrier can increase these properties by 1.2-2.0 times in comparison with the original rock. Surface modification was carried out by means of impregnation with water solutions of the modifier and subsequent heat treatment; heating at boiling point in water solutions with subsequent heat treatment of precipitation. The interaction of modifiers with the surface occurs by the type of ion exchange for silanol or aluminol groups with weak acidity. It is also possible to connect via hydrogen bonds or dipole-dipole and induction interactions. It was found that the degree of grafting of humic compounds is significantly higher on the activated surfaces of the burnt rock. The content of the modifier on the surface of the carrier is 10-40%, depending on the experimental conditions and the nature of the modifier. The most active modifiers are sodium phosphate and potassium carbonate. The kinetics of the interaction of the surface of the burnt rock with potassium carbonate of different concentrations to reduce the specific electrical conductivity of the reaction mixture over time is studied. A comparative study of the sorption properties of grafted surfaces was carried out, depending on the nature of the functional groups of the humic component of the sorbent, the nature and concentration of the metal ion. The degree of sorption of metal ions with mineral carriers increases from 12-15% to 20-90%, depending on various factors. The highest sorbability of new huminomineral sorbents was noted for lead ions.


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