Toxic effects of thiol-reactive compounds on anaerobic biomass

Tepe, Nalan; Shimko, Leah A.; Duran, Metin

doi:10.1016/j.biortech.2005.03.029

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…Regarding to solvent, a decrease of COD removal efficiency occurred only when the biomass was saturated, more than 200 h after the shock load began. Anaerobic biomass can acclimate to toxic compounds and recover from inhibition as long as the toxicant concentration is below a threshold level (Tepe et al, 2006). Therefore, strategies that make the contaminants concentration entering in the reactor lower, for example increasing the dilution rate, should be implemented after toxic state recognition to overcome/minimize the possible problematic contamination of the process.…”

Section: Differentiate the Shock Loadsmentioning

confidence: 99%

Principal component analysis and quantitative image analysis to predict effects of toxics in anaerobic granular sludge

Costa

Alves

Ferreira

2009

Bioresource Technology

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Principal component analysis (PCA) was applied to datasets gathering morphological, physiological and reactor performance information, from three toxic shock loads (SL1 - 1.6 mg(detergent)/L; SL2 - 3.1mg(detergent)/L; SL3 - 40 mg(solvent)/L) applied in an expanded granular sludge bed (EGSB) reactor. The PCA allowed the visualization of the main effects caused by the toxics, by clustering the samples according to its operational phase, exposure or recovery. The aim was to investigate the variables or group of variables that mostly contribute for the early detection of operational problems. The morphological parameters showed to be sensitive enough to detect the operational problems even before the COD removal efficiency decreased. As observed by the high loadings in the plane defined by the first and second principal components. PCA defined a new latent variable t[1], gathering the most relevant variability in dataset, that showed an immediate variation after the toxics were fed to the reactors. t[1] varied 262%, 254% and 80%, respectively, in SL1, SL2 and SL3. The high loadings/weights of the morphological parameters associated with this new variable express its influence in shock load monitoring and control, and consequently in operational problems recognition.

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Section: Differentiate the Shock Loadsmentioning

confidence: 99%

Principal component analysis and quantitative image analysis to predict effects of toxics in anaerobic granular sludge

Costa

Alves

Ferreira

2009

Bioresource Technology

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“…In these reactions, oxo-bridged Fe(III) dimer was reduced to Fe(II) and the thiols were oxidized as follows; glutathione was oxidized to disulphide [39], methionine to sulphoxide [40], while Lcysteine and mercaptoacetic acid [37,38] were oxidized to sulphonic acid respectively. These observed behaviours were rationalized on the basis that though oxidation of thiols is dependent on the nature of oxidant [34,35], thiol oxidation can also occur through N, O, or S atom. For Lcysteine and mercaptoacetic acid reaction systems, electron transfer occurred more readily via S atom since S is more nucleophilic than N or O atoms [37].…”

Section: Introductionmentioning

confidence: 99%

“…Other bridged complexes of iron like phthalocyanines and porphyrazines have been synthesized [32] but their redox reactions not fully reported. The structures of μ-oxo diiron (III) porphyrazine complex and the schematic representation of two μ-oxo diiron complexes with unsubstituted phthalocyanine ligands and their principal properties [32] are shown in Figures 3 and 4 Stronger oxidants oxidize thiols to sulphonic acid but they are oxidized to disulphide by the weaker oxidants [34,35].…”

Section: Introductionmentioning

confidence: 99%

Electron Transfer Reactions of Bridged Binuclear Iron(iii)- Complexes: a Review

Ukoha¹,

Anidobu²,

Egwuonwu³

2023

JCSN

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Binuclear iron (III) complexes comprising of the -oxo-bridged form, [Fe2O]4+ or [Fe(OH)2]4+, and the dicarboxylic bridged chains incorporating salen or saloph ligands have been synthesized and characterized. Their close resemblance to some haeme and non-haeme iron-based enzymes has elicited a lot of interest in studying them. Biological studies have shown some of them to be good mimics of superoxide dismutase. The saloph and salen analogues also showed physiological actions very close to the porphyrins. The study of their electron transfer reactions, with a view of understanding their potential as electron transfer enzymes, has generated interesting results and some unusual kinetic behaviours. Reactions of [(FeHEDTA)2O]2+ with ascorbic acid and some thiols were second order and followed outer-sphere path mediated by ion-pairs formation. However, reaction of [Fe2(bipy)O]4+ with some reductants were zero order with respect to the oxidant and also followed outer-sphere path. Reduction of the adipato-bridged dimer, [Fe(saloph)2µ-adi], by SO32- and SO42-, S2O52-, benzyl mercaptan, mercaptobenzothiazole and thioglycolic acid followed inner-sphere paths. However, all the reactions were acid-catalysed and were mediated by intervening protonated oxidant precursor complexes.

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Toxic effects of thiol-reactive compounds on anaerobic biomass

Cited by 2 publications

References 18 publications

Principal component analysis and quantitative image analysis to predict effects of toxics in anaerobic granular sludge

Principal component analysis and quantitative image analysis to predict effects of toxics in anaerobic granular sludge

Electron Transfer Reactions of Bridged Binuclear Iron(iii)- Complexes: a Review

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