Removal of Cadmium from Dilute Solutions by Hydroxyapatite. III. Flocculation Studies

Matis, K. A.; Zouboulis, Anastasios; Mandjiny, S.; Zamboulis, D.

doi:10.1080/01496399708000760

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…The FI curves obtained by the PDA 2000 have the typical form shown in Fig 1(b) 11, 14. At the beginning of flocculation (after coagulant addition), a small change of R (or FI ) values with time was observed.…”

Section: Methodsmentioning

confidence: 83%

“…The test water (1 L) was dosed with the appropriate dosage of coagulant. Typical conditions were applied for the coagulation experiments, according to those applied in Greek water treatment plants and to previous experience,11 as well as to relevant literature information;1 the suspensions were stirred rapidly at 160 rpm for 105 s during coagulant addition, for an extra 15 s during polyelectrolyte addition, followed by slow stirring at 45 rpm for 10 min and 40 min for settling of flocs. After the coagulant addition, a supernatant sample (30 cm 3 ) was withdrawn immediately for zeta‐potential measurements using a Laser Zee Meter (Model 501) from Pen Kem Inc (Bedford Hills, NY, USA).…”

Section: Methodsmentioning

confidence: 99%

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Comparable evaluation of various commercially available aluminium‐based coagulants for the treatment of surface water and for the post‐treatment of urban wastewater

Zouboulis

Traskas

2005

J of Chemical Tech & Biotech

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In this study the efficiency of various commercially-available coagulants, ie alum and polyaluminium chlorides (PACls), for the treatment of surface (river) water, or for the post-treatment of biologically pretreated urban wastewater were investigated. The different coagulants were comparatively evaluated, considering the removal of suspended solids (SS), natural organic matter (NOM), as well as the residual aluminium concentration, and the removal of phosphates (inorganic phosphorus), in the case of urban wastewater treatment. The dynamics of flocculation were also studied using a Photometric Dispersion Analyser (PDA) in order to compare the flocculation rates and the strength of different coagulant flocs. Finally, the optimum operational conditions, ie coagulant dosage, pH, temperature, duration and intensity of (initial) rapid-mixing rate, were determined for the examined cases. It can be generally supported that PACl coagulants were superior to alum, as they presented higher SS and NOM removal, stronger and larger flocs, higher flocculation rates and lower residual aluminium concentration, which is a very important factor, especially for the treatment of surface water destinated for potable use.

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Section: Methodsmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Comparable evaluation of various commercially available aluminium‐based coagulants for the treatment of surface water and for the post‐treatment of urban wastewater

Zouboulis

Traskas

2005

J of Chemical Tech & Biotech

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Sorptive Filtration

Matis

Lazaridis

2004

Water Encyclopedia

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A typical recent example of sorption is the removal of copper by suspended particulate matter from river water (5). Iron, silicon, and aluminum oxides were used as adsorbents, serving as models of naturally occurring suspended particles. On the other hand, sorption upstream of filtration constitutes a solution; the combined process has been also termed adsorptive filtration (6). In this module (offered by Separation Technologies), fundamental aspects of the process are illustratively given, such as inertial impaction and diffusional interception; however, the latter is effective only in gas filtration. Sorption, in general, is defined as a surface process irrespective of mechanism, adsorption or precipitation (7). Batch and column sorption studies of zinc, cadmium, and chromium were conducted on calcite to determine its retention capacity for these elements common in industrial effluents and to explore its behavior as a purification filter in a continuous flow system.

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