Multipurpose filters with ion-exchanger for the equalization of ammonia peaks

1995 ◽  
Vol 32 (7) ◽  
pp. 199-206 ◽  
Author(s):  
Martin Oldenburg ◽  
Ivan Sekoulov
Keyword(s):  
Operation Time ◽  
Ion Exchanger ◽  
Filter Medium ◽  
Nitrification Rate ◽  
Ion Exchangers ◽  
Flow Rates ◽  
Hydraulic Loading ◽  
Influent Concentration

In this study the use of zeolites as ion-exchangers for equalization of ammonia peak loadings in aerated biological activated filters was investigated. For this use zeolites were mixed with a filter medium and the nitrifying filter was loaded with ammonia peaks for two hours at different flow rates. It could be demonstrated that during the phase of higher inflow concentrations the zeolite was collecting ammonia. When the influent concentration decreased ammonia was desorbed from the zeolite and could be nitrified by the bacteria growing on the filter medium. It was shown that additional zeolites can equalize variations of ammonia, especially in filter units which are working at a high nitrification rate and which are very sensitive to varying influent conditions. During the operation time of the filter no separation of the zeolite by higher hydraulic loading or by backwashing could be recognized. So the upgrading of nitrifying filters with zeolite represents an additional security for effluents containing oscillating ammonia concentrations.

Layered double hydroxide and zirconium phosphate as ion exchangers for the removal of ‘black crusts’ from the surface of ancient monuments

2018 ◽  
Vol 47 (9) ◽  
pp. 2976-2985 ◽  
Author(s):  
E. Boccalon ◽  
M. Nocchetti ◽  
M. Pica ◽  
A. Romani ◽  
M. Casciola
Keyword(s):  
Layered Double Hydroxide ◽  
Zirconium Phosphate ◽  
Ion Exchanger ◽  
Ion Exchangers ◽  
Black Crusts ◽  
Innovative Tool ◽  
Ancient Monuments ◽  
Double Hydroxide

Two ion exchanger solids (LDH and ZrP) as an innovative tool to remove gypsum from ancient monuments.

Promotion of nitrifiers through side-stream bioaugmentation: a full-scale study

2016 ◽  
Vol 74 (7) ◽  
pp. 1736-1743 ◽  
Author(s):  
F. Stenström ◽  
J. la Cour Jansen
Keyword(s):  
Wastewater Treatment ◽  
Efficient Method ◽  
Load Capacity ◽  
Treatment Plant ◽  
Full Scale ◽  
Nitrification Rate ◽  
Flow Rates ◽  
Nitrogen Loads ◽  
Side Stream ◽  
Different Temperatures

Bioaugmentation of nitrifiers from a side-stream treatment is an efficient method for boosting the mainstream process at a wastewater treatment plant (WWTP). Although this technology has been known for several years, the number of full-scale applications for it is limited. For a WWTP approaching its critical nitrogen load capacity, the benefits are doubled if the introduced side-stream treatment for digester supernatant is combined with bioaugmentation. Not only is the nitrogen load to the mainstream process decreased by 10–25%, but the mainstream process is also boosted with nitrifiers, increasing the nitrifying capacity. In this full-scale study, the increment of the nitrification rate is examined in the mainstream process at different temperatures and at different flow rates of returned activated sludge to the side-stream treatment. Our results show that the nitrification rate in the mainstream process was increased by 41% during the coldest period of the study, implying that the examined WWTP could treat considerably higher nitrogen loads if bioaugmentation were permanently installed.

Revisiting syntheses of Ti(iv)/H2PO4–HPO4 functional ion-exchangers, properties and features

2018 ◽  
Vol 42 (2) ◽  
pp. 838-845 ◽  
Author(s):  
Mylène Trublet ◽  
Daniela Rusanova ◽  
Oleg N. Antzutkin
Keyword(s):  
Metal Ions ◽  
Divalent Metal ◽  
Ion Exchanger ◽  
Divalent Metal Ions ◽  
Ion Exchangers ◽  
Strong Affinity

Systematic and readily obtainable ion-exchanger, TiO(OH)(H2PO4)·H2O, with excellent Na+ uptake and strong affinity towards divalent metal ions.

scholarly journals Alkali aluminosilicate geopolymers as binders to encapsulate strontium-selective titanate ion-exchangers

2019 ◽  
Vol 48 (32) ◽  
pp. 12116-12126 ◽  
Author(s):  
Xinyuan Ke ◽  
Susan A. Bernal ◽  
Tsutomu Sato ◽  
John L. Provis
Keyword(s):  
Ion Exchanger ◽  
Ion Exchangers ◽  
Final Disposal ◽  
Geopolymer Cements

Geopolymer cements can be used to solidify strontium-contaminated ion exchanger particles, forming a stable monolith potentially suitable for final disposal.

scholarly journals Equilibrium of aliphatic amino acids on ion exchangers forming complexes in the presence of copper (II) and nickel (II) cations

2019 ◽  
Vol 81 (3) ◽  
pp. 217-224
Author(s):  
L. P. Bondareva ◽  
Y. S. Peregudov ◽  
A. V. Astapov
Keyword(s):  
Amino Acids ◽  
Stability Constant ◽  
Stability Constants ◽  
Distribution Coefficients ◽  
Complex Compounds ◽  
Exchange Chromatography ◽  
Ion Exchanger ◽  
Ion Exchangers ◽  
Aliphatic Carboxylic Acid ◽  
The Stability

The task of isolating and separating amino acids from aqueous solutions exists in various industries. The traditional method of isolation is ligand exchange chromatography. When choosing a cation for ligand-binding chromatography based on its binding strength with the ion exchanger, often used as a sulfonated polystyrene ion exchanger keeps the copper (II) firmly enough, and therefore, it is easily replaced by other cations. Chelating ion exchangers charge cations of copper (II), which hold these ions firmly enough. In this case, separating a mixture of substances, it is due to differences in the constants of complexation agents and complexes distribution coefficients. The study of the interaction of amino acids with the aliphatic carboxylic acid, the exchange of phosphoric acid cations and the amino carboxylic and amino phosphonic polyampholytes has shown a significant effect of the pH of the medium on the nature of the sorption equilibria. Under certain conditions, in the phase of the ion exchanger in the form of complexing metal cations, the formation of new sorption centers is possible, which occur upon sorption of amino acids in the formation of mixed ligand compounds: the sorbent complex may simultaneously comprise amino acids and attached functional groups of the sorbent as ligands. The influence of the hydrogen index of the medium primarily affects the change in the nature of the formed complex compounds in the sorbent phase and the equilibrium solution and the ratio of their stability constants. If the stability constant of the ion exchanger complex is higher than the stability constant of the compound with a low molecular weight ligand, then the sorbed copper cations interact with incoming methionine ions without breaking the metal – functional group of the ion exchanger coordination bond. If the ratio of stability constants is the opposite, then the predominant elution of copper (II) cations occurs with the formation of complex compounds with an amino acid in an aqueous solution.

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