WO2004113239A1 - Procede permettant d'eliminer un polluant d'un milieu aqueux a l'aide d'une membrane - Google Patents

Procede permettant d'eliminer un polluant d'un milieu aqueux a l'aide d'une membrane Download PDF

Info

Publication number
WO2004113239A1
WO2004113239A1 PCT/NL2004/000347 NL2004000347W WO2004113239A1 WO 2004113239 A1 WO2004113239 A1 WO 2004113239A1 NL 2004000347 W NL2004000347 W NL 2004000347W WO 2004113239 A1 WO2004113239 A1 WO 2004113239A1
Authority
WO
WIPO (PCT)
Prior art keywords
membrane
aqueous medium
anaerobic
pollutant
catalyst
Prior art date
Application number
PCT/NL2004/000347
Other languages
English (en)
Dutch (nl)
Inventor
Rick Van Der Vaart
Hendrikus Harmen Brouwer
Jan Gerritse
Original Assignee
Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno filed Critical Nederlandse Organisatie Voor Toegepast- Natuurwetenschappelijk Onderzoek Tno
Publication of WO2004113239A1 publication Critical patent/WO2004113239A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/105—Characterized by the chemical composition
    • C02F3/108—Immobilising gels, polymers or the like
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • C02F1/705—Reduction by metals
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/306—Pesticides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/32—Hydrocarbons, e.g. oil
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to a method for removing a pollutant from an aqueous medium using a membrane.
  • Aqueous media such as drinking water, groundwater and surface water are often polluted with inorganic and/or organic pollutants which are undesirable with a view to public health and/or environment. Due to inter alia agriculture and industrial activities, such substances may end up in the groundwater and surface water on a large scale and, consequently, also in the water that is derived therefrom, particularly in drinking water. In addition, as a result of process steps such as oxidation in water treatment, undesired harmful by-products may be formed which still need to be removed.
  • ion exchange and electrodialysis for ionic pollutants
  • reverse osmosis for relatively large molecules
  • oxidation/ozonization for oxidizable compounds
  • adsorption to active carbon biological conversion and combinations thereof.
  • Biotreatment of aqueous media is relatively inexpensive and suitable for the removal of many types of pollutants.
  • the biological conversion may, for instance, be carried out in a biofilm of bacteria which have been immobilized in a packed-bed reactor, a tubular reactor or a fluidized-bed reactor.
  • anaerobic or anoxic conditions are necessary.
  • pollutants are NO 3 ", NO2", pesticides, chlorocarbons, azo dyes, (per)chlorate and bromate.
  • an electron donor is necessary for reducing pollutants. If this is insufficiently present, this needs to be added to the flow to be treated.
  • suitable electron donors are methanol, ethanol and acetic acid.
  • EP-A-1 178 017 a method is described for removing nitrate from water, in which use is made of catalyst particles comprising a metal such as palladium on a porous particle such as a porous oxide, an expanded polymer or (preferably) carbon flakes with a size of a few mm.
  • a reductor hydrogen may be used.
  • the present invention relates to a method for removing a pollutant from an aqueous medium using a membrane provided with a biofilm comprising a zone with anaerobic bacteria and provided with a catalyst which is, under the method conditions, capable of catalyzing the conversion from oxygen and hydrogen to water, comprising
  • FIG. 1 diagrammatically shows a membrane during the carrying out of a method according to the invention (Fig. 1A) and a membrane according to the state of the art, without catalyst (Fig. IB).
  • the biofilm usually comprises a zone with a very low oxygen concentration in which the anaerobic conversion takes place.
  • the zone is referred to as the anaerobic zone.
  • anaerobic means that, on location, insufficient oxygen (in the form of O 2 ) is present to inhibit the biological reduction of pollutants. More in particular, anaerobic is understood to mean that the oxygen concentration on location is less than 1 ⁇ g/1, with great preference 1 ng/1 to l ⁇ g/1.
  • the biofilm usually comprises a zone located between the bulk of the aqueous medium on the one side and the anaerobic zone and the membrane on the other side in which the oxygen concentration is between the oxygen concentrations of the anaerobic zone and the bulk. This zone is referred to as the aerobic zone.
  • a method according to the invention has been found very suitable for the treatment of groundwater, drinking water or surface water, and in particular for the treatment of an aqueous medium (such as already partly purified groundwater or surface water) in the preparation of drinking water.
  • oxygen is often present in the aqueous medium - for instance in the range of between 1 and 9 mg/1 — which has a considerable adverse effect on the desired anaerobic biological conversion. It has been found that, under such conditions, particularly the removal of pollutants to a concentration (far) below the oxygen and/or nitrate concentration is hampered or becomes unfeasible with a known method.
  • the invention is eminently suitable for the treatment of an aqueous medium, with the weight content of oxygen and/or nitrate in the aqueous medium in the bulk at the start of the conversion being higher than the weight content of pollutants to be converted, preferably at least 5 times higher, more preferably 10 to 1000 times higher.
  • the invention is very suitable for the removal of nitrogen oxides such as NO3", NO 2 - and/or N 2 O.
  • the invention has been found eminently suitable for removing one or more reducible inorganic pollutants, in particular at least one pollutant chosen from the group consisting of bromate, chlorate, perchlorate and sulfate.
  • the invention can be used for degrading all types of aromatic pollutants, including the aromates (that is, hydrocarbons with at least one benzene ring) found on the so-called “black list” published by the Netherlands Ministry of Housing, Spatial Planning and the Environment
  • the invention has been found very suitable for removing one or more reducible organic pollutants, in particular carbon compounds with at least one substituent selected from the group consisting of halogen, sulphoxy, nitro and azo groups, more in particular chloroaliphates such as per, tri and dichloroethene, vinyl chloride, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,2-dichloroethane, chloroform and tetrachloromethane and chlorobenzenes, chlorophenols and the like.
  • substituent selected from the group consisting of halogen, sulphoxy, nitro and azo groups, more in particular chloroaliphates such as per, tri and dichloroethene, vinyl chloride, 1,1,1-trichloroethane, 1,1-dichloroethane, 1,2-dichloroethane, chloroform and tetrachloromethane and chlorobenzenes, chlorophenols and the like.
  • the invention is very suitable for removing one or more pesticides, in particular one or more pesticides chosen from the group consisting of atrazine, ametryn, terbutryn, prometryn, cyanazine, propazine, simazine, simeton, cyromazine, amidine, melamine, DCP (1,2-dichloropropane) bromacil, bentazon, mecoprop, amitrole, MCPA (4-chloro-2-methylphenoxy acetic acid), DDT (dichlorodiphenyltrichloroethane), methoxychlor, lindane and TBA (trichlorobenzoic acid).
  • pesticides chosen from the group consisting of atrazine, ametryn, terbutryn, prometryn, cyanazine, propazine, simazine, simeton, cyromazine, amidine, melamine, DCP (1,2-dichloropropane) bromacil, bent
  • At least one convertible pollutant for instance bromate
  • a content in the range of, for instance, 20-100 ppb to a range of maximally 10 ppb, preferably to a content in the range of approximately 0.1-1 ppb, for instance approximately 0.5 ppb.
  • a special advantage of a method by means of the invention is further the possibility to very effectively remove a pollutant using a membrane on which a relatively thin biofilm is present compared to a known method, preferably having a thickness of approximately 0.01-100 ⁇ m, more preferably of approximately 1-100 ⁇ m, still more preferably of approximately 10-100 ⁇ m.
  • a thin biofilm means less biomass in the system and a lower diffusion resistance from the bulk to the anaerobic zone for the substances to be converted, which allows the use of a less large membrane surface, which requires lower investment costs.
  • the release of the biomass to the flow to be treated can be lower (lower erosion).
  • a hollow-fiber membrane is very suitable.
  • hydrogen gas is led through the lumen of the hollow fiber, where the gas can diffuse outwards through the porous wall and then contacts the catalyst, the biofilm and the aqueous medium.
  • An example of such a fiber in an aqueous medium which is being purified is diagrammatically shown in Fig. 1, in which a hollow fiber is shown whose wall 2 is hydrogen-permeable, has a wall thickness d m and a central lumen 1 through which the hydrogen gas is led.
  • Fig. 1A shows a membrane in a method according to the invention.
  • a porous catalyst layer hatchched layer in zone 3 in which anaerobic bacteria are also present.
  • This layer has a very low oxygen content compared to the bulk water flow 6 and forms the so-called anaerobic zone 3 here.
  • the oxygen content is kept sufficiently low under the influence of the catalyst.
  • a so-called aerobic zone 4 with bacteria may be present, in which the oxygen concentration is high compared to the anaerobic zone.
  • this zone 4 may, without any problems, be eroded by the bulk water flowing by. This allows high flow velocities.
  • the aerobic and anaerobic zones with bacteria together form the biofilm with thickness db + .
  • this is designated db-
  • the thickness of the biofilm, and particularly the aerobic zone therein is generally considerably larger.
  • the anaerobic zone is free from a catalyst layer.
  • the biofilm preferably extends over at least a part of the membrane wall side which is closest to the aqueous medium (usually the outside in the case of a hollow-fiber membrane), more preferably over essentially the whole side.
  • the thickness, specific activity and composition of the biofilm will adjust automatically if the right nutrients (including the pollutant) are present. Suitable bacteria are generally naturally present in the fluid to be purified and can contribute to a suitable biofilm without special measures being necessary.
  • bacteria of which preferably at least one species is present are Ralstonia eutropia (such as ATCC 17697), Pseudomana fluorescens, Xantthomonas maltophila, Flavobacterium indologenes, Alcaligens eutrophus, Pseudomonas maltophila and Pseudomanas putrefaciens.
  • the zone with anaerobic bacteria and the catalyst are preferably at least partly mixed with each other (or, are interwoven with each other) and are preferably in or on the side of the wall of the membrane which is closest to the aqueous medium. It has thus been found that an extremely good fixation of the biofilm and/or the catalyst occurs, so that erosion of at least a substantially anaerobic zone of the biofilm and/or the catalyst is suppressed to a considerable extent or even (virtually) completely prevented.
  • the membrane is preferably based on a hydrophobic carrier material, in particular in the case of a porous carrier material.
  • hydrophobic is defined as a material which has a contact angle with water of more than 90 degrees, preferably to virtually 180 degrees. In general, this means that force needs to be exerted (work needs to be performed) to make water penetrate into the pores.
  • PP polypropene
  • PE polyethene
  • PTFE polytetrafluoroethene
  • PNDF polyvinylidene fluoride
  • the wall of the membrane is usually porous.
  • the porosity can be chosen within broad limits, in general such that, under the method conditions, the hydrogen gas can flow through it and the aqueous medium at least substantially cannot.
  • the number average pore diameter is less than 0.5 ⁇ m. Very good results have been achieved with a number average pore diameter in the range of approximately 0.05-0.2 ⁇ m.
  • the catalyst supports the anaerobicity/anoxicity to the membrane in an aerobic environment.
  • the catalyst preferably comprises at least one precious metal from group VIII of the periodic system, with great preference at least palladium. This has been found to have a good oxygen-converting activity under conditions in which the biofilm is active.
  • the amount of catalyst in relation to the weight of the carrier material of the membrane can be chosen within broad limits and is with preference less than 10 wt.%, with great preference 0.1-1 wt.%.
  • one or more other metals may be added to the catalyst, such as for instance copper, preferably in a total content of less than 10 wt.% in relation to the catalytically active component.
  • copper preferably in a total content of less than 10 wt.% in relation to the catalytically active component.
  • the addition of copper and the like has been found to favorably influence the selectivity of the conversion reaction of nitrate and nitrite to nitrogen.
  • the catalyst can be provided on the carrier material in any manner, and is preferably present as a (finely divided) porous layer.
  • the porosity of the catalyst layer is such that it is permeable to the hydrogen gas, oxygen as well as water.
  • Very suitable is a membrane on which the catalyst has been provided by means of electroless plating. Very good results have been achieved with a membrane obtained by means of such a method as described in Dutch patent application no. 1 023 364. Very good results have been achieved with a membrane where a coating layer has been provided on the catalyst, which coating layer is permeable to oxygen and also to hydrogen, nitrogen and water. Such a layer protects the catalyst against pollutants in the aqueous medium and/or products secreted by the bacteria.
  • the coating layer is a polymeric layer, which may be provided, for instance, by dip coating from a diluted solution of the polymer and then evaporating the solvent.
  • a polymeric layer appears to contribute to keeping the catalyst clean.
  • PPO polypropene oxide
  • the aqueous medium is preferably maintained at overpressure in relation to the hydrogen gas pressure. In this manner, bubble formation is suppressed or completely prevented, which limits the gas transfer to diffusion and prevents hydrogen gas loss due to bubble formation, and/or favorably influences the integrity of the biofilm.
  • the overpressure is at least approximately 0.05 bar, with greater preference approximately 0.1 to 0.5 bar.
  • a method can be applied at any temperature at which the catalyst and the biofilm are active.
  • a skilled person will know how to choose this temperature on the basis of the catalyst and bacteria present.
  • Generally suitable is a method in which at least the anaerobic conversion — and preferably also the conversion of oxygen - takes place at a temperature in the range of 4-90°C.
  • a temperature in the range of 15-30°C is particularly preferred.
  • the invention may very suitably be carried out at a high flow velocity, for instance flow velocities corresponding to a Reynold's number (Re) of approximately 1 to 500, with great preference of approximately 10 to 500.
  • Re is based on the interstitial linear velocity, that is, the actual fluid velocity along the membrane surface.
  • the characteristic length in the calculation of Re is determined by the system and is, in particular in the case of a system with hollow-fiber membranes, the outer diameter of the fibers.
  • the flow velocity is preferably relatively low compared to a method for removing compounds in which the aerobic bacteria play no part or only a minor part.
  • very good results have been achieved with a method in which the flow velocity corresponds to a Re in the range of 1 to 100.
  • the aqueous medium may contain one or more minerals, trace elements and/or vitamins. Examples hereof are described in Dutch patent application no. 1 021 458.
  • the aqueous medium comprises at least one mineral, preferably chosen from the group of phosphates, sulfates, nitrates.
  • the aqueous medium comprises at least one mineral, preferably chosen from the group of phosphates, sulfates, nitrates.
  • the aqueous medium comprises at least one mineral, preferably chosen from the group of phosphates, sulfates, nitrates.
  • counterions one or more cations from the group formed by cations of magnesium, potassium and sodium are very suitable.
  • the aqueous medium comprises at least trace elements such as (i) the cations of iron, zinc, manganese, cobalt, nickel and/or copper; and/or (ii) acids and/or salts of molybdates (salts of MoO 2 -), tungstates (salts of WO 2 "), selenates (salts of SeO 3 2 " ) and/or borates.
  • trace elements such as (i) the cations of iron, zinc, manganese, cobalt, nickel and/or copper; and/or (ii) acids and/or salts of molybdates (salts of MoO 2 -), tungstates (salts of WO 2 "), selenates (salts of SeO 3 2 " ) and/or borates.
  • trace elements such as (i) the cations of iron, zinc, manganese, cobalt, nickel and/or copper; and/or (ii) acids and/or salts of molyb
  • the aqueous medium contains one or more vitamins.
  • the one or more vitamins are preferably chosen from the group consisting of para-aminobenzoic acid, folic acid, DT-lipoic acid, riboflavin, nicotinic acid amide, pyridoxine, pantothenate, vitamin B12 and biotin. Preferably, essentially all these vitamins are present.
  • the minerals, trace elements and vitamins contribute to the desired growth of bacteria.
  • a suitable amount can routinely be determined by a skilled person on the basis of general professional knowledge.
  • the pH can be chosen in a suitable manner on the basis of the catalyst used, bacteria used and the pollutant(s) to be converted. In general, a range of approximately 4.5 to 8.5 is very suitable, although a pH outside this range is also possible. If desired, the medium can be brought to pH in a usual manner, for instance by addition of CO 2 or a corresponding base.
  • the invention may be used in combination with one or more purification procedures for removing undesired components.
  • Such procedures are generally known in the field.
  • the invention is, for instance, very suitable to be applied to an aqueous medium which has first been subjected to ozonization. In ozonization, usually, some bromate, chlorate and/or another pollutant is formed. A pollutant formed during ozonization can then be removed by means of the invention.
  • the invention further relates to the use of a membrane as defined in the specification and/or the claims in the preparation of drinking water, process water, wastewater or ultrapure water (such as demineralized and/or distilled water).
  • the invention further relates to the use of a membrane as defined in the specification and/or claims for maintaining (virtually) anaerobic conditions in a biofilm for removal of a reducible pollutant, and in particular to the use of this membrane for removing oxygen in the biofilm.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Procédé permettant d'éliminer un polluant d'un milieu aqueux à l'aide d'une membrane pourvue d'un biofilm, qui consiste à mettre en contact de l'hydrogène gazeux avec le milieu aqueux à l'aide de la membrane, à réduire l'oxygène le nitrite et / ou le nitrate présent avec l'hydrogène, pour former de l'eau et / ou de l'azote et à convertir biologiquement de manière anaérobie un polluant par réduction avec de l'hydrogène.
PCT/NL2004/000347 2003-05-20 2004-05-19 Procede permettant d'eliminer un polluant d'un milieu aqueux a l'aide d'une membrane WO2004113239A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1023474 2003-05-20
NL1023474A NL1023474C2 (nl) 2003-05-20 2003-05-20 Werkwijze voor het verwijderen van een verontreiniging uit een waterig medium met behulp van een membraan.

Publications (1)

Publication Number Publication Date
WO2004113239A1 true WO2004113239A1 (fr) 2004-12-29

Family

ID=33536497

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2004/000347 WO2004113239A1 (fr) 2003-05-20 2004-05-19 Procede permettant d'eliminer un polluant d'un milieu aqueux a l'aide d'une membrane

Country Status (2)

Country Link
NL (1) NL1023474C2 (fr)
WO (1) WO2004113239A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7384554B2 (en) 2004-05-14 2008-06-10 Northwestern University Methods for total nitrogen removal from waste streams
CN102139897A (zh) * 2011-02-26 2011-08-03 西陇化工股份有限公司 碱金属或碱土金属氯化物中除去溴杂质的方法
CN115072933A (zh) * 2022-06-17 2022-09-20 同济大学 一种同时去除污水中溴代污染物及硝酸盐的方法及系统
CN116075588A (zh) * 2020-04-06 2023-05-05 亚利桑那州立大学董事会 在从水中去除硒酸盐的过程中生产元素硒的方法和系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5116506A (en) * 1989-06-30 1992-05-26 Oregon State University Support aerated biofilm reactor
DE19505436A1 (de) * 1995-02-17 1996-08-22 Solvay Umweltchemie Gmbh Kombiniertes Verfahren zur chemischen und biologischen Behandlung von Wasser
EP1178017A2 (fr) * 2000-07-25 2002-02-06 Süd Chemie Mt S.R.L. Procédé pour la dénitrification de l'eau
WO2002016660A1 (fr) * 2000-08-25 2002-02-28 The University Of Birmingham Procede de reduction mettant en oeuvre un cellule biologique chargee au palladium en tant que catalyseur
US6387262B1 (en) * 2000-06-05 2002-05-14 Northwestern University Hollow-fiber membrane biofilm reactor for autohydrogenotrophic treatment of water

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5116506A (en) * 1989-06-30 1992-05-26 Oregon State University Support aerated biofilm reactor
DE19505436A1 (de) * 1995-02-17 1996-08-22 Solvay Umweltchemie Gmbh Kombiniertes Verfahren zur chemischen und biologischen Behandlung von Wasser
US6387262B1 (en) * 2000-06-05 2002-05-14 Northwestern University Hollow-fiber membrane biofilm reactor for autohydrogenotrophic treatment of water
EP1178017A2 (fr) * 2000-07-25 2002-02-06 Süd Chemie Mt S.R.L. Procédé pour la dénitrification de l'eau
WO2002016660A1 (fr) * 2000-08-25 2002-02-28 The University Of Birmingham Procede de reduction mettant en oeuvre un cellule biologique chargee au palladium en tant que catalyseur

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7384554B2 (en) 2004-05-14 2008-06-10 Northwestern University Methods for total nitrogen removal from waste streams
US7491331B2 (en) 2004-05-14 2009-02-17 Northwestern University Methods for total nitrogen removal
CN102139897A (zh) * 2011-02-26 2011-08-03 西陇化工股份有限公司 碱金属或碱土金属氯化物中除去溴杂质的方法
CN116075588A (zh) * 2020-04-06 2023-05-05 亚利桑那州立大学董事会 在从水中去除硒酸盐的过程中生产元素硒的方法和系统
CN115072933A (zh) * 2022-06-17 2022-09-20 同济大学 一种同时去除污水中溴代污染物及硝酸盐的方法及系统
CN115072933B (zh) * 2022-06-17 2023-07-18 同济大学 一种同时去除污水中溴代污染物及硝酸盐的方法及系统

Also Published As

Publication number Publication date
NL1023474C2 (nl) 2004-11-24

Similar Documents

Publication Publication Date Title
Wenten et al. Extractive membrane bioreactor (EMBR): Recent advances and applications
Lu et al. Recent advances in membrane aerated biofilm reactors
Lee et al. A novel hollow-fibre membrane biofilm reactor for autohydrogenotrophic denitrification of drinking water
Ergas et al. Hydrogenotrophic denitrification of drinking water using a hollow fibre membrane bioreactor
Rittmann The membrane biofilm reactor is a versatile platform for water and wastewater treatment
US7910009B1 (en) Apparatus and methods for water treatment
Sahu et al. Hydrogenotrophic denitrification and perchlorate reduction in ion exchange brines using membrane biofilm reactors
Ravnjak et al. Denitrification of drinking water in a two-stage membrane bioreactor by using immobilized biomass
EP0579630B1 (fr) Membranes sur lesquelles et/ou dans lesquelles sont immobilises des microorganismes, leur procede de production, reacteur les comportant, et procede consistant a les utiliser, notamment pour l'elimination de metaux ou la degradation de composes organiques xenobiotiques
Werkneh Application of membrane-aerated biofilm reactor in removing water and wastewater pollutants: Current advances, knowledge gaps and research needs-A review
Wenten et al. Membrane biosorption: recent advances and challenges
JP2009136725A (ja) アンモニア含有廃水の処理装置
US7186340B1 (en) Perchlorate reduction and related water treatment methods
WO2004113239A1 (fr) Procede permettant d'eliminer un polluant d'un milieu aqueux a l'aide d'une membrane
Morrison et al. Use of membrane bioreactor for biodegradation of MTBE in contaminated water
Modin et al. Simultaneous removal of nitrate and pesticides from groundwater using a methane-fed membrane biofilm reactor
EP3818017A1 (fr) Système et procédé de traitement biologique à biomasse fixée et traitement de charbon actif d'un courant d'eaux usées
Shah et al. Membrane-based Hybrid Processes for Wastewater Treatment
Okabe et al. Biofilm formation potentials in drinking waters treated by different advanced treatment processes
Kajitvichyanukul et al. Potable water biotechnology, membrane filtration and biofiltration
Mansell et al. Biological denitrification in a continuous flow membrane reactor
Lim et al. Microbial community structure of membrane fouling film in an intermittently and continuously aerated submerged membrane bioreactor treating domestic wastewater
Pathak et al. Membrane bioreactors for the removal of micro-pollutants
Grimberg et al. Trinitrophenol treatment in a hollow fiber membrane biofilm reactor
Ghosh et al. Comparative study on treatment of kitchen-sink wastewater using single and multichannel ceramic membrane

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase