Search results for "Nanofiltration"

Identification of tasty compounds of cooked cured ham : physico-chemical and sensory approaches

1997

Abstract Tasty compounds from meat have not been studied in depth. The aim of this work was to isolate, identify and quantify tasty compounds from cooked cured ham and to link them to the sensory evaluations of the fractions from which they are extracted. The extraction of the water-soluble fraction from ham was done by an hydraulic press. The crude extract was ultrafiltered and both gel filtration and nanofiltration allowed to obtain edible fractions. Some links between the physicochemical and sensory data have been found, in particular, the umami taste was related to the presence of IMP and monosodium glutamate. The direct influence of proteolytic peptides on this taste is discussed. More…

Reverse osmosis and nanofiltration membranes for highly efficient PFASs removal: overview, challenges and future perspectives

2021

Today, it is extremely urgent to face the increasing shortage of clean and safe water resources, determined by the exponential growth of both world population and its consumerism, climate change and pollution. Water remediation from traditional chemicals and contaminants of emerging concerns (CECs) is supposed to be among the major methods to solve water scarcity issues. Reverse osmosis (RO) and nanofiltration (NF) membrane separation technologies have proven to be feasible, sustainable and highly effective methods for the removal of contaminants, comprising the extremely persistent and recalcitrant perfluoroalkyl substances (PFASs), which failed to be treated through the traditional water …

Photocatalytic Nanofiltration Reactors

2021

Comparison of different removal techniques for selected pharmaceuticals

2015

[EN] Recently, there is an emergence of endocrine-disrupting compounds, pharmaceuticals, and personal care products (EDC/PPCPs) as important pollutants to remove from drinking water and reclaimed wastewater. In this work, the efficiency of removing pharmaceuticals (PCs) from model aqueous solutions and raw wastewater with ultrafiltration (UF), nanofiltration (NF), activated carbon adsorption (AC), biological methods (SBR) and oxidation with ClO2 was investigated. Some treatments have also been used as combined processes: UF + NF, UF +AC, SBR + ClO2. Ibuprofen, Acetaminophen, Diclofenac, Sulfamethoxazole, Clonazepam, and Diazepam were selected as model compounds. In order to evaluate their r…

Status of hormones and painkillers in wastewater effluents across several European states-considerations for the EU watch list concerning estradiols …

2016

Present technologies for wastewater treatment do not sufficiently address the increasing pollution situation of receiving water bodies, especially with the growing use of personal care products and pharmaceuticals (PPCP) in the private household and health sector. The relevance of addressing this problem of organic pollutants was taken into account by the Directive 2013/39/EU that introduced (i) the quality evaluation of aquatic compartments, (ii) the polluter pays principle, (iii) the need for innovative and affordable wastewater treatment technologies, and (iv) the identification of pollution causes including a list of principal compounds to be monitored. In addition, a watch list of 10 o…

Application of a new dynamic transport model to predict the evolution of performances throughout the nanofiltration of single salt solutions in conce…

2018

Although many knowledge models describing the rejection of ionic compounds by nanofiltration membranes are available in literature, they are all used in full recycling mode. Indeed, both permeate and retentate streams are recycled in order to maintain constant concentrations in the feed solution. However, nanofiltration of real effluents is implemented either in concentration or diafiltration modes, for which the permeate stream is collected. In these conditions, concentrations progressively evolve during filtration and classical models fail to predict performances. In this paper, an improvement of the so called "Donnan Steric Pore Model", which includes both volume and concentration variat…

Preparation of fouling resistant and highly perm-selective novel PSf/GO-vanillin nanofiltration membrane for efficient water purification

2022

International audience; To meet the rising global demand for water, it is necessary to develop membranes capable of efficiently purifying contaminated water sources. Herein, we report a series of novel polysulfone (PSf)/GO-vanillin nanofiltration membranes highly permeable, selective, and fouling resistant. The membranes are composed of two-dimensional (2D) graphite oxide (GO) layers embedded with vanillin as porogen and PSf as the base polymer. There is a growing interest in addressing the synergistic effect of GO and vanillin on improving the permeability and antifouling characteristics of membranes. Various spectroscopic and microscopic techniques were used to perform detailed physicoche…

Nanofiltration of secondary effluent for wastewater reuse in the textile industry

2008

Abstract Textile industries represent an important environmental problem due to their high water consumption. In many Spanish regions with water scarcity, this fact can be an argument to make wastewater reuse necessary. In this work, a biologically treated wastewater from a cotton thread factory was subjected to nanofiltration (NF) in two ways, direct NF treatment and NF after a pre-treatment stage by ultrafiltration (UF). Nowadays, the factory effluent is treated by an activated sludge process. This effluent has high values of COD (200mgO 2 L −1 ) and TDS (5000mg L −1 ) which makes its use in the textile processes impossible. In such situations, reverse osmosis (RO) has been typically used…

Preparation of novel high permeability and antifouling polysulfone-vanillin membrane

2020

International audience; A novel high-performance nanofiltration membrane was fabricated by a simple and scalable route involving in situ cross-linking of hydrophilic, cheap, and environmentally friendly vanillin as antifouling agent with polysulfone (PSf) for salt rejection performance. Vanillin acts as a porogen, which induces a negative surface charge on the membrane surface due to the presence of polar functional groups like alcohol and aldehyde. The surface properties, including charge, morphology, and hydrophilicity, were investigated in detail using analytical instruments. The nanofiltration performance of the fabricated PSf-vanillin membranes was dependent on the percentage of vanill…

Preparation of Highly Clarified Anthocyanin-Enriched Purple Sweet Potato Juices by Membrane Filtration and Optimization of Their Sensorial Properties

2016

The aim of this work was to prepare clarified anthocyanin-enriched juices from purple sweet potatoes (PSP) and to evaluate their sensorial properties, with promising prospect for antioxidant molecules. Four PSP juice samples were prepared and annotated as (1) crude PSP extract, (2) PSP extract followed by microfiltration, (3) by ultrafiltration and (4) by nanofiltration (4). Although anthocyanins retention was observed during the filtration process, PSP microfiltrated juices generated better permeate with compromising between appearance transparency and anthocyanin content. Juice sensory properties (color, flavor, mouthfeel and clarity) were optimized by an L9(34) orthogonal design using PS…