Evaluation of the effects of shaking intensity on the process of methylene blue discoloration by metallic iron

Noubactep, Chicgoua; Kurth, A.-M.F.; Sauter, Martin

doi:10.1016/j.jhazmat.2009.04.046

Cited by 31 publications

(50 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1 shows that CLO removal was: (i) the highest (55%) in system "Fe 0 alone", intermediate (3-15%) in systems "MnO 2 + Fe 0 , and (iii) the lowest (2%) in system "MnO 2 alone". These observations (i) demonstrate the crucial role of free precipitating corrosion product of the process of contaminant removal as recalled above and (ii) corroborate results achieved by Noubactep and colleagues while investigating the mechanism of uranium removal [28,34,35] and methylene blue discoloration [29,30] in Fe 0 /MnO 2 /H 2 O systems. It should be recalled that while uranium and CLO are reducible species, methylene blue discoloration cannot be explained by any redox process.…”

Section: Resultssupporting

confidence: 86%

“…This concept was comprehensively presented in several readily accessible papers for the investigation of the mechanism of uranium removal [27,28] and methylene blue discoloration [29,30] in Fe 0 /H 2 O systems. The author has described the important fact that MnO 2 mainly retards the availably of "free" ICPs in the early phase of Fe 0 oxidative dissolution while the net effect of MnO 2 is to sustain iron corrosion.…”

Section: The Fe 0 /Mno 2 /H 2 O Systemmentioning

confidence: 99%

See 1 more Smart Citation

Investigating the mechanism of clofibric acid removal in Fe0/H2O systems

Ghauch¹,

Assi²,

Tuqan³

2010

Journal of Hazardous Materials

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 86%

Section: The Fe 0 /Mno 2 /H 2 O Systemmentioning

confidence: 99%

Investigating the mechanism of clofibric acid removal in Fe0/H2O systems

Ghauch¹,

Assi²,

Tuqan³

2010

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…Therefore, a fourth mechanism for decontamination in packed Fe 0 beds is The concept that contaminants are fundamentally removed by adsorption and co-precipitation is consistent with many experimental observations which remained non-elucidated by the reductive transformation concept [11,12]. Although researchers are continuing to maintain the validity of the latter concept [24][25][26], the new concept was validated [27,28] and has been independently verified [29,30]. As a matter of course the concept of adsorption/co- …”

mentioning

confidence: 52%

“…Although researchers are continuing to maintain the validity of the latter concept [24][25][26], the new concept was validated [27,28] and has been independently verified [29,30]. As a matter of course the concept of adsorption/co- …”

Section: Metallic Iron For Reactive Wallsmentioning

confidence: 99%

Dimensioning metallic iron beds for efficient contaminant removal

Noubactep¹,

Caré

2010

Chemical Engineering Journal

Self Cite

View full text Add to dashboard Cite

Remediation of contaminated groundwater is an expensive and lengthy process. (ii) used Fe 0 amounts must represent 30 to 60 vol-% of the mixture, and (iii) Fe 0 beds are deep-bed filtration systems. The major output of this study is that thicker barriers are needed for long service life. Fe 0 filters for save drinking water production should use several filters in series to achieve the treatment goal. In all cases proper material selection is an essential issue. [5][6][7][8], and (ii) as reagents to assist biofiltration in household filters [3,9,10]. The fundamental process responsible for contaminant removal in both contexts is necessarily the oxidative dissolution of Fe 0 (iron corrosion) which may be coupled with contaminant reduction (reactive walls) or the subsequent precipitation of iron hydroxides which may be coupled with contaminant adsorption and co-precipitation (household filters).Adsorption, co-precipitation and chemical transformations (oxidation and/or reduction) are not mutually exclusive [11][12][13]. It is obvious that in household filters and reactive walls, a synergy between these three processes is responsible for expected and observed decontamination. Moreover, these processes proceed in the inter-granular porosity of the packed beds which are made up of Fe 0 (100 %) or a mixture of Fe 0 and an inert material (e.g. gravel, pumice, sand) [2,14]. Because of the volumetric expansive nature of the process of iron corrosion [15], the porosity of the filtrating systems certainly decreases with increasing service life, possibly yielding complete permeability loss system (filter clogging) [16,17]. The filling of the pore volume by corrosion products is necessarily coupled with improved size exclusion capacity. Therefore, a fourth mechanism for decontamination in packed Fe 0 beds is The concept that contaminants are fundamentally removed by adsorption and co-precipitation is consistent with many experimental observations which remained non-elucidated by the reductive transformation concept [11,12]. Although researchers are continuing to maintain the validity of the latter concept [24][25][26], the new concept was validated [27,28] and has been independently verified [29,30]. As a matter of course the concept of adsorption/co- Metallic iron for household filtersWhile using slow sand filtration for water treatment in rural Bangladesh, it was observed that the filter efficiency for arsenic removal depends on the iron content of natural waters. Arsenic was readily removed from Fe-rich natural waters. Accordingly, Fe 0 is used "to provide a constant input of iron (soluble or surface precipitate) for groundwater low in soluble iron"[32]. The very efficient resulting filter for As removal was the 3-Kolsi filter [10,33]. A typical 3-Kolsi filter contained a layer of about 3 kg Fe 0 (100 % Fe 0 ). However, the 3-Kolsi filter was not sustainable as it clogged after some 8 weeks of operation [3,34].The remarkable efficiency of 3-Kolsi filters has prompted researchers to further develop the system fo...

show abstract

“…under various conditions for the purpose of discoloring methylene blue with metallic iron, where it was determined that the materials considered were scrap iron, granular activated carbon, and deep sea manganese nodules. From fifty days of experimentation, discoloration of methylene blue is related to shaking intensity, where the peak shaking intensity is 50 min −1 [92].…”

Section: Soils and Groundwatermentioning

confidence: 99%