Adsorption of small organic solutes from beet distillery condensates on reverse-osmosis membranes: Consequences on the process performances

International audienceReverse osmosis (RO) is an attractive process for the detoxification of distillery condensates before their recycling at the fermentation stage. However, transfer mechanisms through dense NF and RO membranes are still not well understood for the organic solutes to eliminate, and rejection results could be disappointing. This study aims at correlating the membrane and solute characteristics (polarity, surface charge, molecular weight, etc.) to the transfer results and further to the process performances. This was achieved through the study of the sorption isotherms of five target inhibitory compounds (acetic and butanoic acids, furfural, 2-phenethyl alcohol and 2,3-butanediol) on three commercial RO membranes (ESPA2, CPA2 and BW30), the compounds being alone as well as mixed in order to evaluate the competition effects. Results reveal that acetic acid and 2,3-butanediol develop few interactions with the membrane material while furfural and 2-phenethyl alcohol present strong sorption of Langmuir type. Extended Langmuir equation succeeded in accounting for the solutes' sorption in mixtures insofar as acetic acid is not considered as competitor since it follows a different transfer mechanism. Coupled with their molecular weight (MW), low rejections obtained for acetic acid and furfural at pilot-scale as well as high rejection results for 2,3-butanediol and 2-phenylethanol could be explained

Extraction of a tricarboxylic acid from a sugar-cane by-product – Study and modeling of the anion-exchange step

Extraction of a tricarboxylic acid from a sugar-cane by-product – Study and modeling of the anion-exchange step . 16. Congrès de la Société Française de Génie des Procédés "Le Génie des Procédés au Service de l'Homme" (SFGP 2017

ANTONIO [Material gráfico]

Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 201

Principes de la modélisation de procédés continus de séparation chromatographique dans l'industrie sucrière

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Innovations en matière de procédés pour une gestion durable de l'eau dans les industries alimentaires

Innovations en matière de procédés pour une gestion durable de l'eau dans les industries alimentaires. Sustainable and efficient food systems: food, water and energy nexu

Gestion de l'eau dans les industries des sucres: traitement de condensats d'évaporation en vue de leur recyclage

Disponibles en quantité souvent importante et de bonne qualité, les condensats issus de la concentration thermique de liquides constituent une source d’eau recyclable en fabrication, moyennant un traitement approprié aux usages recherchés. La problématique illustrée ici au travers de deux exemples pris dans les industries des sucres, qui gèrent de grandes quantités d’eau et d’effluent : le premier, en sucrerie, concerne le recyclage en diffusion des condensats issus de la concentration de sirop, ou eaux ammoniacales, le second le recyclage en fermentation des condensats d’évaporation de vinasses de distillerie

Recovering L-malic acid from a beverage industry waste water: Experimental study of the conversion stage using bipolar membrane electrodialysis

Recovery of L-malic acid from a by-product of alcoholic fermentation process containing mainly sugars, alcohols, minerals, malate and other organic salts was investigated in order to ensure a cost-effective valorisation. Environmental-friendly process could consist in a two-stage electrodialysis process associating concentration electrodialysis (CED) and bipolar membrane electrodialysis (BMED). The feasibility of the CED stage has been assessed in a previous study [1]. BMED with two-compartment cell (BP/C) was investigated on a model potassium malate solution over the range 0.4-1.2 equiv. L-1 giving current efficiency, L-malic acid recovery and specific energy consumption of 87-97%, 93-97% and 1.15-1.27 kWh kg(-1) L-malic acid, respectively. These performances were confirmed by runs on real concentrate obtained from the previous CED stage. However, specific energy consumption was significantly increased (50%) by the presence of anionic impurities, stressing the importance of a very efficient preliminary purification step. At last, the two-stage electrodialysis process allowed malate purity to be raised from 9% in the initial effluent to more than 70%. (C) 2012 Elsevier B.V. All rights reserved

Filterability and filtration experiences of viscous complex food salting solutions

The main focus of this study was to find out the suitable coupling for the regeneration of a complex concentrated ternary brine (salt/corn syrup/water) after fish fillet salting using separation technologies. Experiments were designed for analytical purposes with three selected waste brines originating from different clean solutions and salting process conditions, and processing as well as plant parameters (for example, economics, environment, technical availabilities) were considered. In this regard, several chemical and physical pretreatments were first conducted to increase the size of suspended solids (SS) and to reduce the proteinaceous matters in the suspension. Treated suspensions and their separated phases after settling were subjected to various filtration experiments. Crossflow micro- and ultra-filtration pilot trials (tubular ceramic membranes) showed their inefficiency in terms of permeation flux density, even at high temperature. This was mainly because of the high viscosity of solutions which in turn lowered the shear stress near the membrane. Laboratory- and industrial-scale cake filtration experiments using a rotary vacuum precoat filter (RVPF) were also conducted to find the optimal filtration conditions with the help of a unifying filterability parameter. The best coupling appeared to be pH pretreatment, followed by a settling time adjusted to the salting process conditions. Using body feed for the SS-rich phase, a differential RVPF filtration of the settled phases allowed the regeneration of solution with minimal filter-aid consumption

Flow cytometry: a relevant tool to assess the integrity, polarization, and fluidity of bacterial cytoplasmic membrane

Flow cytometry: a relevant tool to assess the integrity, polarization, and fluidity of bacterial cytoplasmic membrane. 33. Congress of the International Society for Advancement of Cytometry (CYTO 2018

Membrane separation in food processing

International audienc