Electrochemical degradation of PAH compounds in process water: a kinetic study on model solutions and a proof of concept study on runoff water from harbour sediment purification

Muff, Jens; Søgaard, Erik Gydesen

doi:10.2166/wst.2010.129

Cited by 28 publications

(19 citation statements)

References 13 publications

(16 reference statements)

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“…) were in the same order of magnitude as degradation rates of other aromatic organics reported in the literature [8,15] and as the oxidation rates of the PAHs fluoranthene and pyrene obtained in the same setup at comparable current densities [26]. This showed that the initial oxidation of aromatic organics by the applied anode material was predominantly independent on the chemical nature of the molecules.…”

Section: Rno Absorbance Versus Ph By Chemical Adjustmentsupporting

confidence: 83%

Study of electrochemical bleaching of p-nitrosodimethylaniline and its role as hydroxyl radical probe compound

2011

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In the present paper, research on the electrochemical bleaching of p-nitrosodimethylaniline (RNO) in different electrolyte systems is presented with special attention to the role of RNO as a selective hydroxyl radical probe compound. At a Ti/Pt 90 -Ir 10 anode, RNO was found to be bleached in 0.050 M sodium sulphate electrolyte due to lattice active oxygen without hydroxyl radicals being intermediately present. In 0.050 M sodium chloride, the bleaching rate was greatly enhanced due to indirect bulk oxidation by active chlorine species, again without the presence of hydroxyl radicals in the oxidation mechanisms. Under galvanostatic electrolysis, a linear relationship was found between the concentration of added chloride to a supporting sodium sulphate electrolyte and the first order rate constant of the bleaching reaction, showing the importance of the indirect bulk chlorine bleaching in chloride electrolyte systems. In this fashion both the chemically bonded active oxygen and the chemical bulk oxidation by active chlorine species proved to be valid bleaching pathways of RNO that according to these findings cannot be regarded as a fully selective hydroxyl radical probe compound. In addition, the difference in the mechanisms of chloride electrolysis at Ti/ Pt 90 -Ir 10 and Si-BDD anodes was clearly demonstrated using t-BuOH as hydroxyl radical scavenger.

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Section: Rno Absorbance Versus Ph By Chemical Adjustmentsupporting

confidence: 83%

Study of electrochemical bleaching of p-nitrosodimethylaniline and its role as hydroxyl radical probe compound

2011

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“…6a and b). This supports prior findings [27], where the applied current density of 25 mA cm −2 was found as the most efficient setting during galvanostatic electrolysis of a similar PAH solution.…”

Section: Fate Of Halogenated Pahs During Eosupporting

confidence: 91%

“…PAHs as naphthalene, fluoranthene, and pyrene have in prior research been showed to be readily oxidized through EO in chloride electrolyte [27]. However, when increasing concentrations of sodium hypochlorite were added to batches of 0.10 M NaCl and PAH solutions no significant removal was observed (Fig.…”

Section: Identification Of Chlorinated Pahsmentioning

confidence: 88%

Identification and fate of halogenated PAHs formed during electrochemical treatment of saline aqueous solutions

Muff

Søgaard

2011

Journal of Hazardous Materials

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a b s t r a c tHalogenations of polycyclic aromatic hydrocarbons (PAHs) comprise a serious problem, when electrochemical oxidation (EO) is applied for treatment of chloride and bromide containing polluted sea water. In this study, the possible non-polar halogenated byproducts formed were identified in a series of chemical hypochlorination experiments using GC-MS, and the analytical information from these experiments was used in the primary EO treatment tests. An electrochemical cell equipped with a Ti/Pt 90 -Ir 10 anode was used in a batch recirculation setup with naphthalene, pyrene, and fluoranthene as the parent PAHs. Contrary to the chemical hypochlorination experiments, naphthalene as the most soluble compound was the only one to be halogenated in detectable amounts during EO. In a single sodium chloride electrolyte, up to 13% of the initial naphthalene was chlorinated at the peak concentration during treatment before it was subsequently removed. Even small concentrations of added bromide in a mixed electrolyte completely dominated the byproduct pattern with formation of primarily mono brominated naphthalene in peak concentrations up to 30-39% of the initial naphthalene. All of the considered byproducts were despite a more recalcitrant behavior degraded at prolonged treatment times, which need to be applied to ensure a safe discharge of the treated water.

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“…Using the water purification techniques and with suitable production we can eliminate these problems (11,13).…”

Section: Discussionmentioning

confidence: 99%

“…Within this method, Salmonella did not exist any longer after being washed by the neutral anolyte. Washing and sterilizing the meat processing instruments by neutral anolyte has many advantages in comparison with other approaches (10,11).…”

Section: Contextmentioning

confidence: 99%

Study of Electrochemical Water Reactor Concerning Food Safety in Industerial Food Processing

Ahari

Anvar

2016

Ann Mil Health Sci Res

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Context: Water molecule is one of the best known polar molecules in nature, on the grounds that this molecular property gives special importance to its chemical structure and its role in life. Our objective was to investigate cleaning in place with electrochemical water. Evidence Acquisition: Provided that the water molecule with its oxygen and hydrogen parts does not get completely decomposed, its structure changes in terms of shape and quality. The changed shape will be preserved for long hours and the activation trend for such kind of water molecule will increase. Methods: This process is called "Electrochemical Activation". The reactor is able to produce two kinds of Catholyte and Anolyte waters. The electrochemical water is produced with different pHs. In the present study, the bacteriostatic and bacteriocidic ability of the anolyte water were studied with respect to four bacterial species including Staphylococcus areus, Entrobacter, Pseudomonas florescence, and Bacillus cereus. The effective factor of the natural anolyte included active chlorine and a compound of oxygen (hypochlorous, ozone, and peroxide). Results: The function range of this natural anolyte has been emphasized for cleaning and sterilizing medical equipment. Conclusions: Electrochemical water reactor in food safety is important and sutible for cleaninig in place and is envoirementalfriendly.

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Electrochemical degradation of PAH compounds in process water: a kinetic study on model solutions and a proof of concept study on runoff water from harbour sediment purification

Cited by 28 publications

References 13 publications

Study of electrochemical bleaching of p-nitrosodimethylaniline and its role as hydroxyl radical probe compound

Study of electrochemical bleaching of p-nitrosodimethylaniline and its role as hydroxyl radical probe compound

Identification and fate of halogenated PAHs formed during electrochemical treatment of saline aqueous solutions

Study of Electrochemical Water Reactor Concerning Food Safety in Industerial Food Processing

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