Ferrate(VI) in the Treatment of Wastewaters: A New Generation Green Chemical

Tiwari, Diwakar; Lee, Seung‐Mok

doi:10.5772/15500

Cited by 21 publications

(26 citation statements)

References 70 publications

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“…With increase in pH, BEPS content always increased, while SEPS concentration was reduced firstly and then increased and with the minimum at neutral condition. pH had important effect on chemical speciation of K 2 FeO 4 [15]. HFeO 4 − and FeO 4 2− are predominant in neutral and alkaline pH, in which Fe(VI) was known to be relatively stable towards its spontaneous decomposition to ferric ion (Fe(III)).…”

Section: Impact Of Ph On Distribution and Composition Of Eps After K mentioning

confidence: 99%

“…Furthermore, the total extractable EPS content after K 2 FeO 4 conditioning was lower than that in the blank at different pH values. It is well-known that K 2 FeO 4 cannot only act as oxidizer [15], but the ferric ions from reduction process serve as coagulants. Thus it can removed SEPS through electrical neutralization and interfacial adsorption and compress EPS structure, leading to reduction in total extractable EPS content [10].…”

Section: Impact Of Ph On Distribution and Composition Of Eps After K mentioning

confidence: 99%

“…These techniques include (photo) Fenton oxidation [11][12][13], acid/alkaline [14] and thermal treatment [1] and enzymatic treatment or the integrated processes. Potassium ferrate (K 2 FeO 4 ) is known as a new generation green chemical which can oxidize and degrade a wide variety of organic contaminants in water [15]. Additionally, ferrate(VI) ions will be reduced to Fe(III) ions or ferric hydroxide, which can serve as a coagulant in the mixing unit process.…”

Section: Introductionmentioning

confidence: 99%

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Variations in distribution and composition of extracellular polymeric substances (EPS) of biological sludge under potassium ferrate conditioning: Effects of pH and ferrate dosage

Zhang

Cao

Wang

et al. 2016

Biochemical Engineering Journal

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a b s t r a c tThe effect of pH on chemical conditioning with potassium ferrate (K 2 FeO 4 ) for improving sludge filtration dewatering performance has been studied. The variation of extracellular polymeric substances (EPS) in conditioning process was investigated in detail to unravel the reaction mechanism. The results indicated that sludge dewaterability was improved by decreasing solution pH in terms of filtration rate and cake solids content. At acid conditions, protonation of EPS resulted in reduction of negative charge and densification of sludge floc. Sludge conditioning efficiency was improved with decrease in pH. Ferrate can solubilize EPS through oxidation process and also remove a portion of soluble EPS (SEPS) by charge neutralization and interfacial adsorption of hydrolyzed ferric ions, consequently compressing EPS and decreasing total extractable EPS content. In addition, when pH and potassium ferrate were 3 and 0.1 g/gTSS, the sludge filtration dewatering rate and extent reached the maximum. Deterioration of sludge dewaterability was observed as the ferrate was overdosed (>0.2 g/gTSS). This could be attributed to the release of a large amount of bound EPS (BEPS) as a result of ferrate oxidation, consequently increasing the sludge filtration resistance.

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Section: Impact Of Ph On Distribution and Composition Of Eps After K mentioning

confidence: 99%

Section: Impact Of Ph On Distribution and Composition Of Eps After K mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variations in distribution and composition of extracellular polymeric substances (EPS) of biological sludge under potassium ferrate conditioning: Effects of pH and ferrate dosage

Zhang

Cao

Wang

et al. 2016

Biochemical Engineering Journal

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“…For example, organic compounds and colloids can compete for the surface of amorphous MnO 2 , leading to lower removal of carbamazepine (He et al, 2012). Even with selective oxidation processes like ferrate and permanganate oxidation, they will not only attack pharmaceuticals containing electron-rich organic moieties, but also aliphatic and aromatic organic compounds (Ghernaout and Naceur, 2011; Tiwari and Lee, 2011), phosphate (Lee et al, 2009), and taste and odor compounds (Srinivasan and Sorial, 2011). Thus, other compounds in the matrix compete with the pharmaceuticals for Fe or Mn.…”

Section: Nonspecificitymentioning

confidence: 99%

Pharmaceutical removal from water with iron- or manganese-based technologies: A review

Liu

Sutton

Rijnaarts

et al. 2016

Critical Reviews in Environmental Science and Technology

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Pharmaceuticals are detected at trace levels in waters. Their adverse effects on aquatic ecosystems and human health demand novel pharmaceutical removal technologies for treating wastewater effluents. Iron (Fe) or manganese (Mn) may play important roles in these new technologies since these metals are abundantly available at low costs and are known to contribute to organic conversions via physico-chemical, chemical, and biologically related processes. Few reviews describe and discuss Fe-or Mn-based technologies for the purpose to remove pharmaceuticals from water. Therefore, we review the current literature sorted into the three removal mechanisms, that is., through physico-chemical, chemical, and biological processes. The principals, performance, and influential parameters of these three types of technologies are described. Current and potential applications of these technologies are critically evaluated in order to identify advantages and challenges. In addition, the Fe-or Mn-based technologies which are currently not used but promising to further develop to remove pharmaceuticals cost efficiently are proposed.

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“…Two extreme oxidation states of iron were tested: Fe 0 nanoparticles (zero-valent iron nanoparticles, nZVI) and Fe +6 (ferrate, Fe(VI)). Ferrate is a very strong oxidant whose superior performance for environmental remediation has been demonstrated in various recent researches [11][12][13]. On the other hand, ZVI in the form of nanoparticles is a strong reductant with a large specific surface and has been utilized for groundwater remediation and wastewater treatment [14,15].…”

Section: Introductionmentioning

confidence: 99%

Chemical Degradation of PCDD/F in Contaminated Sediment

Hrabák

Homolková

Černík

2016

Ecological Chemistry and Engineering S

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Due to the extreme toxicity of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F), the remediation of PCDD/F aquifer source zones is greatly needed; however, it is very difficult due to their persistence and recalcitrance. The potential degradability of PCDD/F bound to a real matrix was studied in five systems: iron in a high oxidation state (ferrate), zero-valent iron nanoparticles (nZVI), palladium nanopowder (Pd), a combination of nZVI and Pd, and persulfate (PSF). The results were expressed by comparing the total toxicity of treated and untreated samples. This was done by weighting the concentrations of congeners (determined using a standardized GC/HRMS technique) by their defined toxicity equivalent factors (TEF). The results indicated that only PSF was able to significantly degrade PCDD/F. Toxicity in the system decreased by 65% after PSF treatment. Thus, we conclude that PSF may be a potential solution for in-situ remediation of soil and groundwater at PCDD/F contaminated sites.

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Ferrate(VI) in the Treatment of Wastewaters: A New Generation Green Chemical

Cited by 21 publications

References 70 publications

Variations in distribution and composition of extracellular polymeric substances (EPS) of biological sludge under potassium ferrate conditioning: Effects of pH and ferrate dosage

Variations in distribution and composition of extracellular polymeric substances (EPS) of biological sludge under potassium ferrate conditioning: Effects of pH and ferrate dosage

Pharmaceutical removal from water with iron- or manganese-based technologies: A review

Chemical Degradation of PCDD/F in Contaminated Sediment

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