Dennemeyer Octimine

Membrane technology patents

Laura HorcajadaLaura Horcajada

in-line quantification and characterization of membrane fouling

Methods of detecting, quantifying and/or characterizing the fouling of a device from a combination of pressure and spectroscopic data are provided. The device can be any device containing components susceptible to fouling. Components can include membranes, pipes, or reactors. Suitable devices include membrane devices, heat exchangers, and chemical or bio-reactors. Membrane devices can include, for example, microfiltration devices, ultrafiltration devices, nanofiltration devices, reverse osmosis, forward osmosis, osmosis, reverse electrodialysis, electro- deionisation or membrane distillation devices. The methods can be applied to any type of membrane, including tubular, spiral, hollow fiber, flat sheet, and capillary membranes. The spectroscopic characterization can include measuring one or more of the absorption, fluorescence, or raman spectroscopic data of one or more foulants. The methods can allow for the early detection and/or characterization of fouling. The characterization can include determining the specific foulant(s) or type of foulant(s) present. The characterization of fouling can allow for the selection of an appropriate de-fouling method and timing.

Publication number: WO2016092371A1 | Search similar patents

A cross-flow filtration apparatus

The present invention concerns a cross-flow filtration apparatus (10) comprising a filtration means (50) having a feed inlet means (18,22), a permeate outlet means (16) and a retentate outlet means (20).The feed inlet means of the apparatus (10) includes a first conduit (18) in fluid communication from a process zone (12) to a buffer zone (14) and a second conduit (22) in fluid communication from the buffer zone (14) to the filtration means (50).The retentate outlet means (20) is in fluid communication with the buffer zone (14) and the permeate outlet means (16) is in fluid communication with the process zone (12).In use, substantially undiluted permeate is accumulated in the process zone (12), whilst a suspension of retained matter is accumulated in the buffer zone (14).The apparatus (10) of the present invention is suitable for treating wash liquor from laundry or dishwashing machines or the like.

Publication number: EP0995483A1 | Search similar patents

Concentration polarization identification and mitigation for membrane transport

Disclosed herein is a membrane separation apparatus with reduced concentration polarization and enhanced permeate flux. Also disclosed is a method for separating permeate from retentate in a fluid using the disclosed membrane separation apparatus. Also disclosed is a method for inhibiting or preventing concentration polarization of a permeable membrane used in membrane separation.

Publication number: US2014076728A1 | Search similar patents

Method for controlling permeability by high frequency wave and method for producing organic membrane for separation

The present invention relates to a method for controlling a permeability of a substance to be separated through an organic separation membrane in a separation process of substances by an organic separation membrane, characterized in that the method comprises irradiating the organic separation membrane with a high frequency wave to cause vibration/rotation of a molecule or a domain thereof constituting the organic separation membrane and alter the molecular structure and/or polarity of the organic separation membrane, and thus altering a permeability of the substance to be separated; and also a method for producing an organic separation membrane, characterized by irradiating with a high frequency wave in a process of producing the organic separation membrane to alter the permeability thereof.

Publication number: EP1300187A1 | Search similar patents

Membrane filtration method and apparatus for simultaneously and continuously monitoring time-based membrane fouling

A membrane filtration method and an apparatus for continuously monitoring the state of a membrane during the filtration, particularly for membrane fouling due to cake or gel layers of solutes developed on the surfaces of a filtered membrane, by estimating a membrane potential and a membrane solute rejection while making measurements of a set of physical properties of feed, variations of a streaming potential difference across pores of the membrane, variation in pressure differences between an upstream side and a downstream side of the membrane, and concentration differences between the feed and permeate filtered through the membrane.

Publication number: US6463790B1 | Search similar patents

Membrane purification system

A membrane purification system and method are described in which a first membrane, an osmotically active agent, and a second membrane are utilized to separate fluid components. In general, fluid is moved through the first membrane into an osmosis compartment containing the osmotically active agent by the osmotic force of an osmotically active agent disposed between the first membrane and the second membrane. The fluid is forced from the osmotically active agent and through the second membrane while the second membrane retains the osmotically active agent in the osmosis compartment. The osmotically active agent may include a polymer.

Publication number: US2006011544A1 | Search similar patents

Spiral wound filter assembly

The invention relates to a filter assembly for membrane filtration of liquids, and more in particular a spiral wound filter assembly with improved filtration performance. Provided is a spiral wound filter assembly comprising a permeate channel (5; 305, 325) for transporting permeate to the permeate outlet (12), said permeate channel being provided with at least one flow restriction (13; 113, 120; 213; 333), for increasing the pressure in at least part of the permeate channel. The invention further relates to an apparatus comprising such a filter assembly, and to methods for using this apparatus.

Publication number: WO2009005350A1 | Search similar patents

Enzymatic treatment of alginate to reduce membrane fouling for water or wastewater purification

This disclosure examines using alginate lyase to catalytically degrade alginate in order to decrease affinity and fouling potential to membranes of 0.2 and 0.02 μm pore size, respectively within a process line of a filtration system. Enzymatically treated alginate caused less fouling on both ultrafiltration and microfiltration membranes than original alginate. Enzymatically treated alginate is predicted to cause less fouling on both membranes within the pH range of approximately 3.0 to approximately 10.0. Without the presence of calcium cation, alginate lyase reduced the foulant resistance by more than 82% for both membranes. In the presence of 1 mM calcium cation, alginate lyase reduced the foulant resistance by more than 55%. In addition, the foulant structure composed of enzymatically treated alginate was more readily removed by backwashing, suggesting reversible fouling. The advantages of using enzymatic technique to control membrane fouling include high efficiency and no damage to the membrane materials.

Publication number: US2013037484A1 | Search similar patents

Liquid recovery and purification in biomass pretreatment process

The invention includes a process for recovering the liquids used in pretreatment of biomass for production of bio-fuels and other biomass based products. Liquid recovery and purifications minimizes waste production and enhances process profitability.

Publication number: EP2499296A1 | Search similar patents

Membrane surface cleaning using particles

The present invention relates to a process for cleaning of a surface comprising treatment of the surface with a composition comprising particles of a chemical agent and with a rinse liquid wherein the chemical agent disperses and/or at least partly dissolves. The chemical agent preferably is a water insoluble salt like CaCO3.Any surface that is susceptible to fouling is suitable for the cleaning according to the invention, for instance a membrane surface used in microfiltration, ultrafiltration, nanofiltration or reverse osmosis.

Publication number: EP1920821A1 | Search similar patents

Filtration method and apparatus

An improved method and apparatus for filtration includes an outer stationary body (10), an inner rotating body (12) defining a gap with the outer body for receiving a fluid sample (14), the surface of one of the bodies defining the gap being a filter. The rotation of the inner body creates Taylor vortice which continuously displace occluded solute on the filter surface. The filter can be a membrane.

Publication number: EP0165992A4 | Search similar patents

Osmotic concentration by membrane

A hydrophobic semi-permeable membrane process (e.g., using hydrophobic microporous hollow fibers) for the concentration of a dilute solution of low osmotic pressure by osmotic distillation (also known as membrane distillation or membrane evaporation), which is a separation process using as its driving force the difference in the osmotic pressure between two fluids (e.g., fruit juice and seawater) separated by a hydrophobic semi-permeable membrane to achieve a concentration of the fluid having the lower osmotic pressure (.e., fruit juice). When coupled with reverse osmosis means there is provided a method for recovery of solvent (e.g., potable water) from the process, e.g., desalination of seawater. A process is also provided to recover part of the energy available between the two fluids i.e., between two different potential energies, due to the difference in osmotic pressure between the two fluids.

Publication number: WO8603135A1 | Search similar patents

Membrane filtration of a product

The invention refers to a method for membrane filtration of a product in a membrane plant (1), containing the phasesA) filtering the product with a first membrane system (2) of the membrane plant (1),B) cleaning the first membrane system (2) by a multi-step cleaning procedure including at least one rinsing-step with water and at least one cleaning step with a cleaning solution, resulting in at least one contaminated cleaning solution,C) filtering the at least one contaminated cleaning solution with a second membrane system (9), resulting in a recovered cleaning solution andD) using the recovered cleaning solution in a cleaning step of phase B).

Publication number: EP1888212A2 | Search similar patents

Cross-flow filtration device and method of manufacturing said device

A cross-flow filtration device (10) including a structure of porous material which defines a plurality of passageways (12) extending longitudinally from the feed end (40) of the structure to a retentate end, and a number of filtrate conduits (14) within the structure for carrying filtrate from within the structure toward a filtrate collection annulus (36). The filtrate conduits (14) provide paths of lower flow resistance than that of alternative flow paths through the porous material, and the structure is constructed such that the filtrate conduits (14) are distributed among the passageways (12) to provide low pressure drop flow paths for filtrate flow from the passageways (12) through the porous material to nearby filtrate conduits (14). The cross-flow filtration device can also be utilized as a membrane support for a device for cross-flow microfiltration, ultrafiltration, reverse osmosis, gas separations or pervaporation.

Publication number: EP0310632A4 | Search similar patents

Apparatus and method for the monitoring of membrane deposition

An in-line apparatus for monitoring membrane deposition is provided having an exterior body that defines an interior compartment for receiving a fluid stream. A coupon rack is positioned in the interior compartment and suspends at least one coupon holder. The coupon holder holds at least one membrane for collection of deposition present within a filtration system. The apparatus allows examination of membrane surface deposition without sacrificing a membrane element and also provides timely diagnostic information on a filtration system. The present invention also provides a method of monitoring membrane deposition as well as a filtration system incorporating an in-line apparatus for monitoring membrane deposition.

Publication number: US6017459A | Search similar patents

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