Removal of cyanobacteria and cyanotoxins from lake water by composites of bentonite with micelles of the cation octadecyltrimethyl ammonium (ODTMA)

Sukenik, Assaf; Viner-Mozzini, Yehudit; Tavassi, Mordechay; Nir, Shlomo

doi:10.1016/j.watres.2017.04.075

Cited by 31 publications

(32 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An evaluation of the maximal number of bacteria that could be retained by 1 g of the complex [5,8,9] indicates that the available area of the complex is several orders of magnitude larger than the total area of the external surfaces of bacteria. Hence, the limit on the number of bacteria which can be adsorbed is dictated by the balance between adsorption and desorption processes.…”

Section: Discussionmentioning

confidence: 99%

“…Hence, the limit on the number of bacteria which can be adsorbed is dictated by the balance between adsorption and desorption processes. For filtration of a single species of bacteria, a model of kinetics of filtration, which considered convection, adsorption, and desorption could simulate and yield predictions for the kinetics of bacteria filtration [5,6,8,9]. In the initial stages of filtration in the current experiments (on a time scale of days in the case of the filters used) only a few bacteria were found to be emerging through the filter, but eventually the pores in the filter included free bacteria, which could reproduce, and the numbers of bacteria emerging through the filter kept increasing with the volume passed and with time.…”

Section: Discussionmentioning

confidence: 99%

“…However, in a filter the powdered complex had to be mixed with an excess of a granulated material, such as sand, whereas the granulated complex can be included exclusively in filters, which enables upscaling. Recent studies demonstrated efficient removal of (i) pathogenic and indicator bacteria [7,8], and (ii) cyanobacteria [9], by filling filters with granulated micelle-clay complexes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Microwave Radiation on Regeneration of a Granulated Micelle–Clay Complex after Adsorption of Bacteria

et al. 2020

Self Cite

View full text Add to dashboard Cite

Granulated micelle–clay complexes including the organic cation octadecyltrimethylammonium (ODTMA) were shown to be efficient in removal of total bacteria count (TBC) from water. Microwave (MW) heating of granules to restore bacterial removal was investigated. Drying of granules by MW required 20-fold less energy than by conventional heating. When water content of granules approached 10%, or less, their heating period by MW had to be below 1 min, e.g., 30 s, and less, in order to avoid ignition and irreversible structural changes. Structural and thermal properties of MW heated samples were studied by FT-IR spectra and thermo gravimetric analyses (TGA). Inactivation of bacteria in water was more efficient by MW than by conventional oven, or by electric plate. For elimination of bacteria from water, MW heating was at least five-fold more efficient than by conventional heating. The results have established an adequate regeneration procedure by MW heating at durations depending on the remaining percentage of water associated with the granules. Tests of first and second regenerations by MW heating, and HCl washing of columns, were carried out. It was concluded that MW treatment may be chosen for optimal regeneration of the granulated micelle–clay complex as an efficient and low-cost procedure.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Microwave Radiation on Regeneration of a Granulated Micelle–Clay Complex after Adsorption of Bacteria

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sukenik, et al demonstrated that addition of 75 µg/L ODTMA cations abolished completely the photosynthetic activity of Aphanizomenon (cyanobacteria) cells within 20 to 40 min. Kalfa, et al suggested that a micelle-clay complex which released during filtration a larger number of QACs was more efficient in removing from water bacteria, due to the biocidal/biostatic effect of the released cations [17,22]. This might suggest that removal of bacteria from water by filtration is expected to be more efficient by a small increase of the ratio of ODTMA/ clay in the complex, which will enhance the concentrations of cations released during filtration.…”

Section: Biocidal Effects Of Quaternary Amine Cations (Qacs)mentioning

confidence: 99%

Water Purification by a Micelle-Clay Composite Alone and its Collaboration with other Technologies

Nir¹

2019

OAJWX

Self Cite

View full text Add to dashboard Cite

Removal of chemicals and pathogenic microorganisms by filtration may provide safe drinking water, and decrease the risk from harmful disinfection by products. Micelle-clay complexes produced have a relatively large surface area, large hydrophobic fractions, and are positively charged to about half of the cation exchange capacity of the clay. Their material characteristics differ from those of organo-clays of the same composition, which are formed by adsorption of cations as monomers. Granulated micelle-clay composites (0.4 to 2mm) formed by the organic cation ODTMA (Octadecyltrimethylammonium), removed efficiently from water by filtration chemicals, such as herbicides, and dissolved organic matter, pharmaceuticals, perchlorate, and microorganisms, such as bacteria, viruses and a parasite, such as crytosporidium. Bacteria removed included (a) Escherichia coli S-17; (b) total bacteria count (TBC); and (c) Cyanobacteria (Microcystis and Aphanizomenon). A model which considered convection, adsorption, and desorption simulated the filtration results and yielded predictions. The emphasis in this minireview is on collaboration of this technology with other procedures, which may enhance treated water quality and reduce the costs of treatment. Thus a new approach intends to utilize both filtration and biocidal/biostatic activity of free cations in removal of microorganisms from water. A two stage purification of greywater by a moving bed reactor followed by a micelle-clay filter yielded an order of magnitude increase in the capacity of the filter. Water purification by filtration followed by solar photocatalysis enabled removal of recalcitrant molecules and indicator bacteria from secondary treated wastewater, thus yielding high quality water for irrigation. Other examples are reduction of membrane fouling of UF membranes and a suggested reduction of fouling of RO membranes by a pretreatment by the micelle-clay filter, or its combination with granulated activated carbon filter.

show abstract

“…A resonance example of the threat of biosafety for potable water consumption, in the case of implementation of such a form of stability's disturbance in water ecosystem, is the situation in the Middle East's Lake Kinneret [4]. Another example of such the form of instability of aquatic ecosystem is the mass development of cyanobacteria, which has been observed for several years in the Baltic Sea [5].…”

Section: Introductionmentioning

confidence: 99%

Modeling Systemic Colorimetric Parameters as a Tool for Processing Images of Clumps of Toxic Cyanobacteria Targeted at Their Boundaries Detection

Bespalov

Nosov

Kabalyants

2017

Preprint

View full text Add to dashboard Cite

Removal of cyanobacteria and cyanotoxins from lake water by composites of bentonite with micelles of the cation octadecyltrimethyl ammonium (ODTMA)

Cited by 31 publications

References 28 publications

Effect of Microwave Radiation on Regeneration of a Granulated Micelle–Clay Complex after Adsorption of Bacteria

Effect of Microwave Radiation on Regeneration of a Granulated Micelle–Clay Complex after Adsorption of Bacteria

Water Purification by a Micelle-Clay Composite Alone and its Collaboration with other Technologies

Modeling Systemic Colorimetric Parameters as a Tool for Processing Images of Clumps of Toxic Cyanobacteria Targeted at Their Boundaries Detection

Contact Info

Product

Resources

About