WO2007105974A1 - Procédé biologique de traitement des eaux usées - Google Patents

Procédé biologique de traitement des eaux usées Download PDF

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Publication number
WO2007105974A1
WO2007105974A1 PCT/PT2006/000007 PT2006000007W WO2007105974A1 WO 2007105974 A1 WO2007105974 A1 WO 2007105974A1 PT 2006000007 W PT2006000007 W PT 2006000007W WO 2007105974 A1 WO2007105974 A1 WO 2007105974A1
Authority
WO
WIPO (PCT)
Prior art keywords
biomass
chamber
zeolites
wastewater treatment
effluent
Prior art date
Application number
PCT/PT2006/000007
Other languages
English (en)
Inventor
António Manuel CARDOSO MARQUES FERREIRA
Original Assignee
Tecnia-Processos E Equipamentos Industriais E Ambientais
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 Tecnia-Processos E Equipamentos Industriais E Ambientais filed Critical Tecnia-Processos E Equipamentos Industriais E Ambientais
Priority to PCT/PT2006/000007 priority Critical patent/WO2007105974A1/fr
Publication of WO2007105974A1 publication Critical patent/WO2007105974A1/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
    • C02F3/101—Arranged-type packing, e.g. stacks, arrays
    • 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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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 current invention is a biological process to treat wastewater that uses zeolites and can simultaneously carry out secondary and tertiary treatment. It is essentially constituted by one or more stages combined in series, each one of them having a chamber for aeration of the effluent with suspended biomass followed by a chamber with immobilized zeolites and also a module for biomass retention that separates the suspended biomass and the clarified effluent.
  • Primary treatment reduces the suspended solids and biochemical oxygen demand (BOD) load in downstream treatment processes.
  • Secondary treatment removes the dissolved and suspended organic matter and is normally processed through contact between microorganisms and the organic content of the effluent.
  • Tertiary treatment has as its fundamental objective the removal nutrients such as nitrogen and phosphorous .
  • Wastewater containing pollutants is usually- treated using biological processes.
  • the process is characterized by the wastewater passing through some type of reactor, tank or basin where microorganisms are utilized for converting impurities existing in the water into harmless products such as carbon dioxide and water.
  • the suspended growth method know as the activated sludge process, is one of the most widely used biological processes .
  • Most municipal wastewater treatment plants use this technology in their secondary stage for removing organic pollutants from the wastewater.
  • the conventional activated sludge system comprises an aerobic tank (operating under aerobic conditions) and a clarifier (know as a secondary clarifier) .
  • the wastewater and the activated sludge recirculated from the clarifier flow into the aeration tank. Air or oxygen is supplied to the aeration tank through an aeration system.
  • the pollutants are either degraded or adsorbed by the activated sludge.
  • the aeration tank mixed liquor then enters the clarifier for the solid-liquid separation phase.
  • the clarified liquid is discharged through the clarifier outlet. Part of the settled sludge in the clarifier is recirculated to the aeration tank.
  • the wastewater besides containing organic pollutants, also has nitrogen, ammonia and phosphorous. These are called wastewater nutrients because they can cause excessive growth of algae (algae blooming) in the receiving water body. These nutrients are not removed in the aeration basin.
  • Some tertiary treatment using aerobic treatment systems with the application of zeolites also currently exist .
  • the zeolites are used in the form of powder, applied as in additive to water filtration and for wastewater treatment plants, as an inducer for sludge flocculation, sedimentation and nutrient reduction, together with the capacity to absorb recalcitrant substances. They are added to the influent stream or directly to the aeration basin.
  • patent JP 10080697 is to eliminate the need for a nitration stage requiring a long time, to regenerate zeolite and to rationally dispose of regenerated waste liquid by recycling the regenerated waste water from a zeolite regenerating stage to a biological denitrification part.
  • a slurry is discharged from a denitrification tank and is aerobically treated in an aeration tank, the treated slurry is introduced into a settling tank to settle and separate the sludge, and the supernatant water is sent to a first zeolite-packed tank to remove ammonia.
  • the water leaving the first zeolite-packed tank is mostly drawn off as a treated water.
  • Part of the treated water is introduced into a second zeolite-packed tank having adsorbed ammonia, air is blown into the tank, hence the water is biologically treated to regenerate zeolite, and the discharged water is joined to raw water as a biologically regenerated wastewater.
  • the two zeolite-packed tanks are prepared in this way, the raw water is introduced into one zeolite- packed tank while the other zeolite-packed tank is biologically regenerated to adsorb and remove ammonia, and the process is alternately repeated.
  • Patent KR 2005018777 relates to a carrier comprising zeolite, scoria and ion charged minerals to biologically treat wastewater and wastewater treatment apparatus comprising a carrier disposed in a multistage aeration tank.
  • the carrier has a granular structure constructed by bonding alkaline scoria usefully used as a carrier of living bodies, zeolite powder having high absorption capability and mineral powder charged with anions to prevent the acidification of the zeolite using cement and a wastewater treatment apparatus for effectively treating wastewater using the carrier.
  • the wastewater treatment apparatus is characterized in that the wastewater is treated by continuously forming activated sludge layers at water inlet ports of aeration tanks and filling the carrier in the activated sludge layers.
  • Patent RU 2060968 relates to the treatment of organic sewage that comprises an installation with an aeration tank having a body with a rectangular cross section, bottom and aeration system, branch pipes supplying the untreated sewage water and discharging the unpurified sewage water and the charge in the form of a cassette .
  • the cassette consists of screens arranged at a distance and zeolite tuff.
  • the screens are made of an inert material with a layer of crushed zeolite tuff applied on them on both sides.
  • the screens can also be made of pressed or monolithic zeolite tuff or in the form of two perforated walls with the crushed zeolite tuff placed between them.
  • the unit is used in the aerobic purification of industrial wastewater ans sewage containing organic substances.
  • Patent WO 85/04390 relates to a process and equipment for removal of suspended material, biogenetic nutrients and dissolved metal compounds from sewage contaminated with organic and/or inorganic substances.
  • contaminated water is contacted with an agent which contains salts or cations of mono, di or trivalent metals in a maximum amount of 50 Mp. cent and rock granules containing at least 25 Mp. cent zeolite, preferably clinoptlolite and/or mordenite .
  • the amount of metal slats resp. cations present in the parent zeolitic rock can be increased according to necessity by ion- exchange, adsorption and/or impregnation, i.e. by combination of these processes following eventual dehydration.
  • the agent obtained is homogenized. It is favorable to carry out biological treatment without nitrification, up to an oxidation of carbon compounds. After secondary settling the water flows through one or more beds - if there are more, connected in series or parallel - filled with zeolite of a grain size between 1 and 10 mm, preferably between 2 and 5 mm, wherein residual ammonia is bound.
  • the exhausted bed can be regenerated biologically or with an aqueous solution of potassium salt .
  • the equipment consists of a primary settling tank, of an aeration basin and a secondary settling tank.
  • the above agent from the preparation container and excess sludge from the secondary settling tank are admixed to the effluent of the primary settling tank in the mixing tank and the mixture is transferred in an adsorption zone communicating with the aerating basin.
  • the rest of the ammonia and of the suspended materials of the effluent are bound and filtered out resp. in beds filled with zeolite in order to remove mechanical impurities.
  • the beds are reflushed with purified water from a buffer tank and in order to reactivate the zeolite filling, aqueous potassium salt is fed from the container.
  • Patent WO 02/044094 relates to a process for enhancing the efficiency of sewage water purification and decreasing the reagent demand. This process is used to remove the dissolved and insoluble, organic and inorganic contaminating materials or combinations thereof from waters.
  • the main feature of the process is that one or more artificial or natural materials containing at least 1% weight crystalline alumino-hydrosilicate having a three dimensional crystal lattice comprising a pore structure of molecular size, preferably one or more types of rock granules containing clinoptilolite, mordenite and/or other zeolites are added to the water to be treated or to the activated sludge, and macromolecules comprising a large number of positively charged groups, preferably cation active polymers are bonded previously to the said materials by physical -chemical bonds so that free positively charged groups still remain on the bonded macromolecules.
  • the bond between the solid material and the organic macromolecules is formed in a one or two step process.
  • Treatment in separate stages automatically implies additional costs with regard to the treatment plant, which has to be equipped with separate basins or reactors for carrying out each stage, namely the second and third stages .
  • the process of this invention carries out simultaneously the second and third stages, i.e. in the same reactor, and the zeolites are in modules inside a reactor. In this process, the zeolites are confined and they are not lost with the excess biomass.
  • the present invention has as its subject matter a process to be applied in the field of water treatment. It can be used to improve existing treatment plants or in new small, medium and large scale aerobic wastewater treatment plants, for either domestic or industrial effluents.
  • this process can carry out at the same time secondary and tertiary treatment. Furthermore, it uses zeolites for the tertiary treatment and uses them without losses, i.e. the zeolites are confined in a special pack that the effluent crosses.
  • Zeolites are three-dimensional, microporous, crystalline solids with well-defined structures that contain aluminum, silica and oxygen in their regular framework; cations and water are located in the pores.
  • the silicon and aluminum atoms are tetrahedrally coordinated with each other through shared oxygen atoms.
  • Zeolites are natural minerals that are mined in many parts of the world. Zeolites have void space (cavities or channels) that can host cations, water or other molecules.
  • Zeolites are natural minerals and they can be found in mines in several parts of the world.
  • zeolites unique.
  • Zeolites applied to wastewater treatment can increase biological activity, improve process efficiency, prevent bulking sludge, remove nutrients and reduce odours.
  • the present invention refers to a wastewater treatment process using one or more stages
  • each one including one chamber (4,9,%) for oxigen-enriched effluent aeration with biomass in suspension where secondary treatment takes place, followed by a chamber (5, 10,%) with immobilized zeolites where tertiary treatment takes place for additional biological conversion, of the biomass and specially for nutrient removal, and finally a module (12) for biomass retention in order to separate the suspended biomass and the clarified effluent.
  • the configuration of the reactor is of the plug flow type, where each pair of chambers, ordered from chamber (4) followed by chamber (5) , is combined together in one stage (6) and the several stages (11, ...) , being grouped in series to obtain the specific required treatment efficiency.
  • Each stage (6, 11%) is characterized by an aeration section or chamber (4) and a zeolite section or chamber (5, 10, ...) , thus in each stage suspended and attached biomasses coexist.
  • the chamber (4) can operates under very -high concentrations of dissolved oxygen, and with very high concentrations of biomass, due to the fact that the aeration process (3), for example using air ejectors, can supply up to 4.6 Kg O 2 /Kwh, and the MLVSS (Mixed Liquor Volatile Suspended Solids) are kept above 10,000 mg/L, because all the biomass existing at the final stage of the process is recirculated to the first stage.
  • MLVSS Mated Liquor Volatile Suspended Solids
  • the biomass filtration at the final stage in the module (12) is carried out using ultra- filtration membranes .
  • the chamber (5) consists of immobilized modules of zeolites, where the modules are box-like parts of adequate configuration, for instance a rectangular prism, containing macro-sized zeolites with a granulometry greater than 0.5 mm.
  • the modules walls are made of a net with space smaller than the zeolite granulometry, to retain all the zeolites and at the same time allow the effluent to pass through the chamber (5) .
  • the modules are packed in such a way as to avoid any preferred flow through the chamber (5) .
  • the chambers (5, 10,%) operate under aerobic conditions in the outer layers in contact with the chambers
  • the process combines secondary and tertiary treatment in one stage. This constitutes a great advantage as it makes it possible to eliminate tanks, reactors and lagoons after secondary treatment in order to proceed with the tertiary treatment, as happens in the treatment plants of the prior art.
  • the reactor that uses the process of this invention is a combination of one or more stages in series, thus the effluent (1) is fed at stage (6) through the chambers (4) and (5) , passing from this stage, if necessary, to stage two (11) through chambers (9) and (10) and continuing through the following stages, in the quantity necessary to obtain final treated water with the required quality.
  • the effluent (13) is filtered in ultra-filtration membranes and discharged. The sludge retained in the membranes is totally recirculated to stage (6) .
  • the excess biomass produced in the chambers (4, 9, ...) is eliminated in view of the oxygen levels in the various chambers, by the cellular retention time in the zeolite chambers and by the biological conversion which occurs in the chambers (5. 10, ...) .
  • the process operates continuously.
  • the back flush of the biomass fixed in the chambers (5, 10,%) is ensured by discontinuous effluent circulation from chamber (4) to the chamber (9) , by pumping with the pump (15) the effluent from one aeration chamber
  • the concentration of the MLVSS Mated Liquor Volatile Suspended Solids
  • the bacteria are accessible in high concentrations for the utilization of substrate and oxygen
  • the sludge activity per unit volume is increased; operating load: 10 - 50 Kg of BOD 5 /m 3 process volume; secondary and tertiary treatment together in one st age ; and zeolites are not released and discharged together with the excess sludge produced in the process. They are confined in their own chamber.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Water Treatment By Sorption (AREA)
  • Activated Sludge Processes (AREA)

Abstract

L'invention concerne un traitement biologique des eaux usées utilisant une ou plusieurs étapes combinées en série, chaque étape comprenant une chambre d'aération des effluents (4) dont la biomasse est en suspension locale dans laquelle le traitement secondaire s'effectue, suivie d'une chambre (5) contenant des zéolites immobilisées dans laquelle le traitement tertiaire s'effectue afin d'obtenir une conversion de la biomasse et une extraction de nutriments supplémentaires, et enfin un module (12) de filtration de la biomasse. À la sortie de l'étape finale (13), l'effluent est filtré à l'aide de membranes d'ultrafiltration (12), avant d'être déversé. Les boues retenues dans (12) sont totalement recyclées vers l'étape (6). Le réacteur combine une aération hautement enrichie en oxygène et les capacités d'absorption, d'échange d'ions et de tamisage moléculaire des zéolites.
PCT/PT2006/000007 2006-03-10 2006-03-10 Procédé biologique de traitement des eaux usées WO2007105974A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/PT2006/000007 WO2007105974A1 (fr) 2006-03-10 2006-03-10 Procédé biologique de traitement des eaux usées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/PT2006/000007 WO2007105974A1 (fr) 2006-03-10 2006-03-10 Procédé biologique de traitement des eaux usées

Publications (1)

Publication Number Publication Date
WO2007105974A1 true WO2007105974A1 (fr) 2007-09-20

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Country Status (1)

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WO (1) WO2007105974A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102951749A (zh) * 2012-11-12 2013-03-06 同济大学 纳米零价铁-多级反滤式系统去除工业废水中重金属的方法及其装置
WO2014181943A1 (fr) * 2013-05-08 2014-11-13 주식회사 그룬 Appareil de filtration utilisant de la tourmaline

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1584373A (en) * 1976-09-21 1981-02-11 Besik F Process for purifying waste waters
WO1985004390A1 (fr) * 1984-04-02 1985-10-10 Vizépito^"Ipari Tröszt Procede et equipement permettant d'extraire un materiau suspendu, des substances nutritives biogenetiques et des composes metalliques dissous a partir d'eaux d'egouts contaminees par des substances organiques et/ou inorganiques
JPH0910793A (ja) * 1995-06-30 1997-01-14 Japan Organo Co Ltd 有機性廃水処理装置
DE19601714A1 (de) * 1996-01-18 1997-07-24 Linde Ag Verfahren zur trägergebundenen biologischen Reinigung von Flüssigkeiten in einem Festbettreaktor
EP0861808A2 (fr) * 1997-02-28 1998-09-02 Kuraray Co., Ltd. Installation de traitement des eaux usées

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1584373A (en) * 1976-09-21 1981-02-11 Besik F Process for purifying waste waters
WO1985004390A1 (fr) * 1984-04-02 1985-10-10 Vizépito^"Ipari Tröszt Procede et equipement permettant d'extraire un materiau suspendu, des substances nutritives biogenetiques et des composes metalliques dissous a partir d'eaux d'egouts contaminees par des substances organiques et/ou inorganiques
JPH0910793A (ja) * 1995-06-30 1997-01-14 Japan Organo Co Ltd 有機性廃水処理装置
DE19601714A1 (de) * 1996-01-18 1997-07-24 Linde Ag Verfahren zur trägergebundenen biologischen Reinigung von Flüssigkeiten in einem Festbettreaktor
EP0861808A2 (fr) * 1997-02-28 1998-09-02 Kuraray Co., Ltd. Installation de traitement des eaux usées

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102951749A (zh) * 2012-11-12 2013-03-06 同济大学 纳米零价铁-多级反滤式系统去除工业废水中重金属的方法及其装置
WO2014181943A1 (fr) * 2013-05-08 2014-11-13 주식회사 그룬 Appareil de filtration utilisant de la tourmaline

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