Search results for: G. Guibaud

Items from 1 to 17 out of 17 results

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Experimental Estimation of 44 Pharmaceutical Polar Organic Chemical Integrative Sampler Sampling Rates in an Artificial River under Various Flow Conditions

R. Guibal, S. Lissalde, G. Guibaud

Environmental Toxicology and Chemistry > 39 > 6 > 1186 - 1195

The present study pertains to a polar organic chemical integrative sampler (POCIS) laboratory calibration to estimate the sampling rates for 44 pharmaceuticals featuring a wide range of polarity (–0.6 < octanol/water partition coefficient [log K_OW] < 5.4). The calibration was performed at 16.0 ± 1.5 °C for 4 water flow velocities (0, 2–3, 6–7, and 20 cm/s) in both a tank (for calibration at...

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Investigation on damaged planar-oxide of 1200V SiC power MOSFETs in non-destructive short-circuit operation

F. Boige, F. Richardeau, D. Trémouilles, S. Lefebvre, more

Microelectronics Reliability > 2017 > 76-77 > C > 500-506

The purpose of this paper is to present an extensive study of three 1200V silicon carbide (SiC) Power MOSFETs in non-destructive, but leading to degradations, short-circuit operation. Unusually, as compared with equivalent device built on silicon, the damage signature is a significant gate current increase but the components are still functional. In order to find the damage location, non-destructive...

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Potential of DGT in a new fractionation approach for studying trace metal element impact on anaerobic digestion: the example of cadmium

I. Bourven, M. Casellas, R. Buzier, J. Lesieur, more

International Biodeterioration & Biodegradation > 2017 > 119 > C > 188-195

Cadmium impact during anaerobic digestion (AD) of lactoserum was investigated by DGT (Diffusive Gradients in Thin films) considering not only total trace metallic element (TME) concentration, but also three operational fractions: particulate, inert soluble and available. During the lactoserum AD process, the effect of addition of different Cd concentrations (1; 5 and 10 μg l⁻¹) was investigated in...

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Mineralogy and metals speciation in Mo rich mineral sludges generated at a metal recycling plant

M. Vemic, F. Bordas, G. Guibaud, E. Joussein, more

Waste Management > 2015 > 38 > Complete > 303-311

In France, more than 250 million metric tons of sludges need to be treated each year. These sludges are either dumped on the landfills or reused as secondary resources in order to preserve natural resources. A large portions of these sludges are mineral sludges, originating from metal recycling plants. In order to estimate their metal recovery potential, these mineral sludges were characterized. Four...

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Effects of physico-chemical factors on the viscosity evolution of anaerobic granular sludge

A. Pevere, G. Guibaud, E. Goin, E. van Hullebusch, more

Biochemical Engineering Journal > 2009 > 43 > 3 > 231-238

The rheological properties of anaerobic granular sludge samples from four full-scale and one lab-scale anaerobic bioreactors were characterized by determining their “limit viscosity” values. These values were deducted from the evolution of the apparent viscosity of granular sludge samples (20mL) at steady shear rate (200s ⁻¹ ) recorded using rotation tests with a wings type measurement cell...

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Biosorption properties of extracellular polymeric substances (EPS) towards Cd, Cu and Pb for different pH values

S. Comte, G. Guibaud, M. Baudu

Journal of Hazardous Materials > 2008 > 151 > 1 > 185-193

The aim of this study was to assess the influence of pH on the metal biosorption of extracellular polymeric substances (EPS) extracted from two different activated sludges called A and B. The composition and physico-chemical characteristics of EPS were determined. The biosorption capacities of the EPS were examined at pH 4, 6, 7 and 8 successively with three metals Cu, Pb and Cd using differential...

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Effect of Na+ and Ca2+ on the aggregation properties of sieved anaerobic granular sludge

A. Pevere, G. Guibaud, E.D. van Hullebusch, W. Boughzala, more

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2007 > 306 > 1-3 > 142-149

Interactions between fine particles (0–50μm) of anaerobic granular sludge were investigated by studying the effect of Na ⁺ or Ca ²⁺ supply on the evolution of the zeta potential and viscosity of granular sludge suspensions. In the Na ⁺ or Ca ²⁺ concentration range investigated, the Na ⁺ addition affected only slightly the evolution of the viscosity of fine particles...

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Identification of rheological parameters describing the physico-chemical properties of anaerobic sulphidogenic sludge suspensions

A. Pevere, G. Guibaud, E. van Hullebusch, P. Lens

Enzyme and Microbial Technology > 2007 > 40 > 4 > 547-554

This work determined rheological parameters able to describe the rheological properties of the flocculant sludge presents in sulphidogenic anaerobic bioreactors, i.e. a MBR (membrane bioreactor) and a CSTR (continuous stirred tank reactor). Both sludges displayed a non-Newtonian rheological behaviour with shear thinning properties, slightly thixotropic for a TSS content ranging from 0 to 23gl ...

article

Part I. Comparison of the efficiency of eight EPS extraction methods

S. Comte, G. Guibaud, M. Baudu

Enzyme and Microbial Technology > 2006 > 38 > 1-2 > 237-245

The efficiency of eight extracellular polymeric substances (EPS) extraction methods was compared on two different activated sludges. Three chemical methods (EDTA, formaldehyde+NaOH, glutaraldehyde), four physical methods (sonication, cation exchange resin, sonication+cation exchange resin, heating) and a control method (centrifugation alone) were tested.EPS quantities extracted were more greater for...

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Part II. Consequences of EPS extraction methods on Pb2+ and Cd2+ complexation

S. Comte, G. Guibaud, M. Baudu

Enzyme and Microbial Technology > 2006 > 38 > 1-2 > 246-252

To study the effect of extraction protocols on extracellular polymeric substances (EPS) metal binding ability, EPS from two activated sludges were extracted by eight extraction protocols: three chemical treatments, four physical treatments and a control. Two pK _a , for each EPS, were determined: pK _a1 may be specific for carboxyl and phosphoric and pK _a2 may be attributed to...

article

Viscosity evolution of anaerobic granular sludge

A. Pevere, G. Guibaud, E. van Hullebusch, P. Lens, more

Biochemical Engineering Journal > 2006 > 27 > 3 > 315-322

The evolution of the apparent viscosity at steady shear rate of sieved anaerobic granular sludge (20–315μm diameter) sampled from different full-scale anaerobic reactors was recorded using rotation tests. The “limit viscosity” of sieved anaerobic granular sludge was determined from the apparent viscosity. The limit viscosity values depended on the applied shear rate, indicating a non-Newtonian behaviour...

article

Characterisation of the evolution of activated sludges using rheological measurements

G. Guibaud, P. Dollet, N. Tixier, C. Dagot, more

Process Biochemistry > 2004 > 39 > 11 > 1803-1810

The rheological characterisation of activated sludge originating from different aeration tanks (ATs) and from lab scale plants was carried out using rotation tests. Two rheological parameters from Bingham's model were used: viscosity (μ _B ) and shear stress (τ _B ). Viscosity and shear stress were strongly influenced by the total suspended solid (TSS) content of sludge, an exponential...

article

Use of a polarographic method to determine copper, nickel and zinc constants of complexation by extracellular polymers extracted from activated sludge

G. Guibaud, N. Tixier, A. Bouju, M. Baudu

Process Biochemistry > 2004 > 39 > 7 > 833-839

The constants of complexation of extracellular polymers (ECPs) extracted from sludges for three metals, Cu, Ni and Zn at pH 7, were determined using a polarographic method (stripping mercury dropping electrode mode (SMDE)). The curves obtained were exploited according to Chau's or Ruzic's method. The influence of the biochemical composition of ECP on the binding of Cu, Ni and Zn was investigated on...

article

Determination of some rheological parameters for the characterization of activated sludge

N. Tixier, G. Guibaud, M. Baudu

Bioresource Technology > 2003 > 90 > 2 > 215-220

The rheological characterization of activated sludge originating from different aeration tanks and from a lab-scale plant was carried out using rotation tests. Two rheological parameters were used: limit viscosity (μ _~ ) and reduced hysteresis area (rHa). μ _~ was strongly influenced by the total suspended solids (TSS) content of sludge and an exponential relation was found between...

article

Relation between extracellular polymers' composition and its ability to complex Cd, Cu and Pb

G. Guibaud, N. Tixier, A. Bouju, M. Baudu

Chemosphere > 2003 > 52 > 10 > 1701-1710

Activated sludges originated from wastewater treatment plants (WWTPs) play an important role in heavy metal removal from effluents. Extracellular polymers (ECP) form a major part of the activated sludge and are heavily involved in biosorption of heavy metals. The complexation of three heavy metals (Cd, Cu and Pb) with ECP extracted from six activated sludges, originated from different WWTPs, was investigated...

article

Towards a rheological parameter for activated sludge bulking characterisation

N. Tixier, G. Guibaud, M. Baudu

Enzyme and Microbial Technology > 2003 > 33 > 2-3 > 292-298

An examination of the rheological behaviour of activated sludge presenting filamentous bulking was carried out. It was shown that rheograms from filamentous sludge exhibit a particular behaviour due to its thixotropic characteristic, contrary to non-filamentous ones. A rheological protocol of measurement of thixotropy consisting of submitting sludge to increasing-decreasing shear rates was proposed...

article

The influence of some parameters upon the aluminium leaching out by limousin soils through batch reactor

G. Guibaud, J. Ayele, M. Mazet

Water Science and Technology > 1996 > 33 > 6 > 271-277

In order to evaluate the influence of an intensive forestry on the monomeric aluminium and organic matter release by the Limousin forest (France), an acidic brown earth soil planted with 3 different forests (centenary Douglas, young Douglas and Chesnuts) was selected. According to batch reactor experiments, the results show that all A horizons the most contaminated distilled water with monomeric...

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