Center Technique du Papier

UST, France

Center Technique du Papier

UST, France
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Ketep S.F.,Center Technique du Papier | Ketep S.F.,National Polytechnic Institute of Toulouse | Fourest E.,Center Technique du Papier | Bergel A.,National Polytechnic Institute of Toulouse
Bioresource Technology | Year: 2013

Microbial bioanodes were formed in pulp and paper effluent on graphite plate electrodes under constant polarization at -0.3V/SCE, without any addition of nutriment or substrate. The bioanodes were characterized in 3-electrode set-ups, in continuous mode, with hydraulic retention times from 6 to 48h and inlet COD from 500 to 5200mg/L. Current densities around 4A/m2 were obtained and voltammetry curves indicated that 6A/m2 could be reached at +0.1V/SCE. A theoretical model was designed, which allowed the effects of HRT and COD to be distinguished in the complex experimental data obtained with concomitant variations of the two parameters. COD removal due to the electrochemical process was proportional to the hydraulic retention time and obeyed a Michaelis-Menten law with respect to the COD of the outlet flow, with a Michaelis constant KCOD of 400mg/L. An inhibition effect occurred above inlet COD of around 3000mg/L. © 2013 Elsevier Ltd.


Ketep S.F.,Center Technique du Papier | Bergel A.,French National Center for Scientific Research | Bertrand M.,French Atomic Energy Commission | Bertrand M.,Aix - Marseille University | And 3 more authors.
Bioresource Technology | Year: 2013

Microbial anodes were formed under polarisation at -0.2V/SCE on smooth graphite plate electrodes with paper mill effluents. Primary, secondary and tertiary biofilms were formed by a successive scratching and re-inoculation procedure. The secondary and tertiary biofilms formed while decreasing the polarisation potential allowed the anodes to provide current density of 6A/m2 at -0.4V/SCE. In contrast, applying -0.4V/SCE initially to form the primary biofilms did not lead to the production of current. Consequently, the scratching/re-inoculation procedure combined with progressive lowering of the applied potential revealed an efficient new procedure that gave efficient microbial anodes able to work at low potential. The observed progressive pH drift to alkaline values above 9 explained the open circuit potentials as low as -0.6V/SCE. The remarkable performance of the electrode at alkaline pH was attributed to the presence of Desulfuromonas acetexigens as the single dominant species in the tertiary microbial anodes. © 2012 Elsevier Ltd.


Huber P.,Center Technique du Papier | Carre B.,Center Technique du Papier
BioResources | Year: 2012

Process waters in deinking mills often feature a strong coloration, due to dyes and pigments released from the recovered paper. This can usually be remediated by pulp bleaching treatment with appropriate chemicals. However, the red shade (from rhodamine dye) is resistant to conventional bleaching treatments. This largely limits the use of deinked pulp in white paper grades. In this review, the available technologies for process water decolorization are discussed (chemical methods, physico-chemical methods and biological treatments). Ozonation of the process water appears to be the most promising technique for decolorization of process water in deinking mills. Other emerging technologies such as photo-catalytic treatment or mineralization by white-rot fungi (after adsorption on low-cost agricultural residues) should be considered as well.


Huber P.,Center Technique du Papier | Nivelon S.,Center Technique du Papier | Ottenio P.,Center Technique du Papier | Nortier P.,CNRS Structural Engineering
Industrial and Engineering Chemistry Research | Year: 2013

Papermills manufacturing recycled board usually face severe calcium carbonate scaling problems. We present a mass flow balance simulation of this papermaking process (PS2000, G2-based), coupled with a chemical reaction engine (IPhreeqc). The simulation allows predicting the pH and calcite saturation index throughout the process. Developed chemistry modules can simulate anaerobic microbial activity in the process waters, together with local contact with the atmosphere. Also, chemistry models of the integrated wastewater treatment (with anaerobic and aerobic treatment steps) are developed. The coupled simulation accurately describes the scaling tendency of process waters. This makes it possible to study curative solutions to the scaling problems in recycled board mills. The effect of a biocide treatment is simulated and discussed. This is predicted to largely reduce scaling in the wastewater treatment and limit the amount of generated sludge. © 2012 American Chemical Society.


Vena A.,CNRS System Conception and Integration Laboratory | Perret E.,CNRS System Conception and Integration Laboratory | Tedjini S.,CNRS System Conception and Integration Laboratory | Tourtollet G.E.P.,Center Technique du Papier | And 3 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2013

In this paper, we demonstrate for the first time that a 19-bit chipless tag based on a paper substrate can be realized using the flexography technique,which is an industrial high-speed printing process. The chipless tag is able to operate within the ultra-wide band (UWB) and has a reasonable size ( cm ) compared to state-of-the-art versions. Thus, it is possible to use this design for various identification applications that require a low unit cost of tags. Both the simulation and measurement results are shown, and performance comparisons are provided between several realization processes, such as classical chemical etching, flexography printing, and catalyst inkjet printing. © 2013 IEEE.


Huber P.,Center Technique du Papier | Nivelon S.,Center Technique du Papier | Nortier P.,CNRS Structural Engineering
Tappi Journal | Year: 2012

Calcium carbonate scaling often is a critical problem for recycled board mills that have closed water circuits. The objective of this study was to determine local scaling risks throughout the production process. To predict scaling potential, we calculated several saturation indexes, based on speciation determined from detailed water analyses. Calculated scaling trends are in accordance with observed dissolution and precipitation of calcium carbonate in the process, when considering local aeration phenomena. The importance of volatile fatty acids (resulting from anaerobic bacterial activity) in calco-carbonic equilibriums is discussed, and taken into account in the speciation calculation. We also demonstrate the need to measure inorganic carbon instead of alkalinity in such conditions. This makes typical scaling indexes, such as the Ryznar Stability Index, irrelevant to predict scaling risk in closed circuit conditions; thus, it is necessary to use general speciation methods, as described in this paper. Application: By using speciation and appropriate analytical methods, papermakers have access to scaling risk indexes that are reliable, even in contaminated closed water circuit conditions.


Torres C.E.,Complutense University of Madrid | Lenon G.,Center Technique du Papier | Craperi D.,Center Technique du Papier | Wilting R.,Data Management | Blanco A.,Complutense University of Madrid
Applied Microbiology and Biotechnology | Year: 2011

Microbiological control programmes at industrial level should aim at reducing both the detrimental effects of microorganisms on the process and the environmental impact associated to the use of biocides as microbiological control products. To achieve this target, new efficient and environmentally friendly products are required. In this paper, 17 non-specific, commercial enzymatic mixtures were tested to assess their efficacy for biofilm prevention and control at laboratory and pilot plant scale. Pectin methylesterase, an enzyme found in the formulation of two of the mixtures tested, was identified as an active compound able to reduce biofilm formation by 71% compared to control tests. © Springer-Verlag 2011.


Calcium carbonate scaling is a critical problem in papermills. It often has been observed that scaling occurs in aerated sections of the process, where CO 2 stripping from the solution is responsible for the saturation increase with respect to CaCO 3. To better cope with scaling problems, it is important to be able to predict both supersaturation levels after aeration and the rate at which the system becomes supersaturated. In this study, trials are performed on a bubble column. Air is bubbled to strip out the dissolved CO 2 from a CaCO 3-CO 2-H 2O system. The saturation kinetics with respect to CaCO 3 are followed by recording pH, and analyzed by speciation calculations. Aeration conditions are determined through gas hold-up and bubble size measurements. A general kinetic model is proposed to estimate how fast a solution will become saturated with respect to calcium carbonate during aeration. The model is applied to water quality and aeration conditions typically encountered in some unit operations of the papermaking process. Knowing the rate of change of calcium carbonate saturation will help papermakers to better estimate scaling risk in their process, and will help equipment suppliers to either minimize scaling problems in aerated sections of the process or design aeration units for calcium carbonate removal by controlled precipitation. © 2011 American Chemical Society.


Patent
Center Nationale Of La Recherche Scientique and Center Technique Du Papier | Date: 2013-02-04

A process for treating a solid substrate coupled to a polyol, wherein said polyol bears free hydroxyl groups, comprising the grafting of at least one fatty acid having an aliphatic chain comprising at least 12 carbon atoms onto said solid substrate coupled to a polyol by esterification of at least one free hydroxyl group of said polyol.


Patent
French National Center for Scientific Research and Center Technique Du Papier | Date: 2013-12-30

Film having liquid-water, grease, gas and water-vapour barrier properties, comprising a PVA film grafted on the surface with a fatty acid.

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