WO2019155105A1 - Installation de traitement d'eaux résiduelles - Google Patents

Installation de traitement d'eaux résiduelles Download PDF

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Publication number
WO2019155105A1
WO2019155105A1 PCT/ES2019/070061 ES2019070061W WO2019155105A1 WO 2019155105 A1 WO2019155105 A1 WO 2019155105A1 ES 2019070061 W ES2019070061 W ES 2019070061W WO 2019155105 A1 WO2019155105 A1 WO 2019155105A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
installation according
filtration
wastewater
biological treatment
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/ES2019/070061
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English (en)
Spanish (es)
Inventor
Victorino Diez Blanco
Cipriano Ramos Rodriguez
José María Cámara Nebreda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Universidad de Burgos
Original Assignee
Universidad de Burgos
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 Universidad de Burgos filed Critical Universidad de Burgos
Publication of WO2019155105A1 publication Critical patent/WO2019155105A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • 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
    • 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

Definitions

  • the present invention encompasses in the field of wastewater treatment facilities, specifically, with an installation where biological treatment occurs, for example, by aerobic or anaerobic digestion, of the wastewater to be treated by subsequently filtering the resulting effluent of said biological treatment, significantly improving water quality. If anaerobic digestion is used, the facility allows biogas to be obtained, which can be used both in the facility itself and for refining and use as fuel. The installation is especially useful in the treatment of so-called complex wastewater.
  • Document CA 2943072 shows a wastewater treatment that includes a primary water treatment by means of a micro-sieve to produce a primary effluent and a primary sludge. There is a secondary treatment of the primary effluent by means of a bioreactor that uses a membrane through which oxygen is supplied and on which a film of microorganisms is developed to produce a secondary effluent and an activated sludge as waste.
  • WO 2008121373 shows an apparatus for the treatment of contaminated water, particularly for the simultaneous elimination of nitrate, perchlorate and other organic pollutants contained in said contaminated water.
  • MfR biofilm membrane bioreactor
  • a system for the biological purification of wastewater consisting of a reactor body that employs biofilms, an aeration system and filtration membranes for the purification of wastewater , as well as, comprises a hopper for the digestion and storage of sludge.
  • the object of the invention is a wastewater treatment facility.
  • the technical problem to solve is how to maintain high concentrations of biomass active and low concentration of suspended solids in the internal currents, which reduce the fouling of the filtration membranes of the installation, with a view to increasing the performance and effectiveness of said installation.
  • the installation comprises a first biological treatment tank and a second filtration tank.
  • the biological treatment could be aerobic or anaerobic.
  • the first tank is filled with a messy material adapted to form a bed with a surface extension on which microorganisms responsible for the biological treatment of wastewater adhere, which convert an organic matter of the wastewater into dioxide of carbon (C0 2 ), if the biological treatment is aerobic, or in biogas in the case that said treatment is anaerobic.
  • the disordered material may comprise a density lower than that of water, so as to form a floating bed within the first reservoir.
  • the second tank contains micro-filtration or submerged ultrafiltration membrane modules.
  • the first tank and the second tank are communicated with each other both by upper ends and by lower ends, and the second tank is adapted to be stirred with a first gas stream, for example, air or other oxygen-containing gas (0 2 ), in the event that the biological treatment applied in the first tank is aerobic, or an inert gas for anaerobic digestion in the event that said treatment is anaerobic.
  • a first gas stream for example, air or other oxygen-containing gas (0 2 )
  • the first gas stream is injected below the membrane modules.
  • “below” implies that the first gas stream can be injected, either through a lower part of the membrane modules themselves, or by means of an injector element independent of the means of membrane, which is disposed separately from these, that is, below a certain distance from said membrane means.
  • an inert gas for anaerobic digestion means any gas other than oxygen (0 2 ) that does not interfere with anaerobic microorganisms that break down organic matter in the first tank of the facility.
  • said inert gas is the biogas itself generated in said first tank.
  • the injection of the first gas stream below the membrane modules is adapted to create a gas-lift effect between the tanks, where, the wastewater to be treated circulates downwardly through the first tank and the effluent resulting from the biological treatment in said first tank circulates upwards through the second tank.
  • the bed of disordered material that is crossed by the wastewater to be treated acts as a filter of the suspended solids of greater size, when there is an adhesion of said solids to the disordered material, thus reducing their concentration in the effluent resulting from the biological treatment in said first tank that reaches the second filtration tank, whereby the fouling of the membrane modules is minimized, increasing the filtration capacity of said membranes with respect to the membrane bioreactors (MBR) Conventional, as well as, reduces the frequency of the cleaning operations of said membranes, which, increases the useful life of the same, as well as, reduces the costs in chemical and operational reagents caused by the shutdown of the installation to lead to clean out
  • the use of the gas-lift effect reduces pumping costs, and above all, eliminates the mechanical stress caused by commonly used electromechanical pumps, which damage the biomass and worsen the quality of the effluent resulting from biological treatment in the First deposit
  • Figure 1 represents a diagram of a first embodiment of the wastewater treatment installation, where an anaerobic treatment is carried out in the first tank, part of the generated biogas is used in the installation, and the second tank is arranged next to the first deposit.
  • Figure 2 represents a diagram of a second embodiment of the wastewater treatment installation, wherein, an aerobic treatment is carried out in the first tank, the second tank is arranged next to the first tank, both tanks are open, and the gas used is air or another gas containing oxygen (O2).
  • O2 another gas containing oxygen
  • Figure 3 represents a scheme of a third embodiment of the wastewater treatment installation, where an anaerobic treatment is carried out in the first tank, part of the generated biogas is used in the installation, and the second tank is arranged inside the first deposit.
  • Figure 4 represents a diagram of a fourth embodiment of the wastewater treatment installation, wherein, an aerobic treatment is carried out in the first tank, the second tank is arranged inside the first tank, both tanks are open , and the gas used is air or another gas that contains oxygen (O2).
  • Figure 5 represents an enlarged detail of the lower end of the second reservoir of any of the embodiments of the preceding figures, wherein a second embodiment of the injection of the first gas stream below the membrane modules is shown.
  • the present invention is a wastewater treatment facility.
  • the installation object of the invention comprises a first biological treatment tank (1) and a second filtration tank (2).
  • the first deposit (1) and the second deposit (2) are communicated directly with each other both by their upper ends (1.1, 2.1) and by their lower ends (1.2, 2.2).
  • the biological treatment carried out in the first reservoir (1) be anaerobic, however, also, as another possible alternative, said treatment It could be aerobic.
  • said tanks (1, 2) must be closed, as shown in Figures 1 and 3, unlike when an aerobic treatment is performed, where the deposits (1, 2 ) could be open at their upper ends (1.1, 2.1), for example, the embodiments shown in Figures 2 and 4.
  • the tanks (1, 2) are separated and arranged side by side, however, in other preferred embodiments, shown in Figures 2 and 4, the second tank (2) is disposed within the first biological treatment tank (1), where the upper ends (1 .1, 2.1) of both tanks (1, 2) are communicated through an overflow (9) connected to the second tank (2) , and its lower ends (1.2, 2.2) are communicated by openings (2.21) made in the second tank (2).
  • the first reservoir (1) is filled with a messy material (3) of high surface area per unit volume, which is adapted to form a bed with a surface extension on which microorganisms adhere charge of biological waste water treatment, which, convert organic matter (pollutant) of the wastewater in carbon (C0 2) dioxide, if the biological treatment applied is aerobic or in biogas, if such treatment is anaerobic.
  • a messy material (3) of high surface area per unit volume which is adapted to form a bed with a surface extension on which microorganisms adhere charge of biological waste water treatment, which, convert organic matter (pollutant) of the wastewater in carbon (C0 2) dioxide, if the biological treatment applied is aerobic or in biogas, if such treatment is anaerobic.
  • the disordered material (3) comprises a density lower than that of water and forms a floating bed within the first reservoir (1).
  • said disordered material (3) could comprise a density greater than that of water, and in this case, be supported within the first tank (1) on a perforated plate or a grid (5).
  • each unit that makes up the bed of messy material (3) can have the shape of a sphere, cylinder, ring, etc., which in turn is formed by a plurality of reliefs or enlarged surfaces that ultimately add the surface area suitable for adhering the biomass
  • the biomass used to inoculate the installation can come from an anaerobic digester or reactor external to the installation (not shown in the figures).
  • the first tank (1) comprises a wastewater inlet (1.3), which, as the name implies, feeds wastewater to be treated to the first tank (1) ⁇
  • the latter contains membrane modules (4) of micro-filtration or submerged ultra-filtration.
  • the membrane modules (4) are selected from hollow, flat fibers or a combination thereof.
  • the second tank (2) is adapted to be agitated vigorously with a first gas stream (b1), either air or another gas containing oxygen (O2) in case of applying an aerobic treatment, or an inert gas for Anaerobic digestion in case of applying anaerobic treatment.
  • a first gas stream (b1) is biogas generated in the first tank (1).
  • the first gas stream (b1) is injected below the membrane modules (4).
  • a compressor (6) can be used.
  • the compressor (6) takes said biogas from the upper end (1.1) of the first tank (1) and / or the upper end (2.1) of the second tank (2) and injects it through the lower end (2.2) of the second tank (2), specifically, as mentioned, below the membrane modules (4). It is evident that, in embodiments where an anaerobic treatment is performed but part of the biogas generated in the installation is not used, or the treatment is aerobic, the foregoing is not fulfilled.
  • an inert gas would be injected for anaerobic digestion other than the generated biogas (in case of anaerobic treatment), or air or other gas containing oxygen (O2) (in case of aerobic treatment), coming from an external source ( 15) to the installation, as shown in figures 2 and 4.
  • the first gas stream (b1) can be injected, either, through a lower part (4.1) of the membrane modules (4), seen in the figures from 1 to 4, or, as shown by the Figure 5, by means of an injector element (16), for example, a through tubes with perforations between 1 mm and 10 mm, which are arranged separated at a certain distance from the membrane means (4), in both cases, generating thick bubbles that ascend through the second reservoir (2).
  • an injector element (16) for example, a through tubes with perforations between 1 mm and 10 mm, which are arranged separated at a certain distance from the membrane means (4), in both cases, generating thick bubbles that ascend through the second reservoir (2).
  • the thick ascending bubbles generated in the second deposit (2) reduce the fouling by deposition of solids on the surface of the membranes that make up said modules (4), and also generate a gas-lift effect between the deposits (1, 2) which circulates the wastewater to be treated downwardly through the first tank (1) and the effluent resulting from the biological treatment in said first tank (1) to penetrate the second tank (2), through its lower end (2.2), and circulating upwardly through said second tank (2).
  • the wastewater to be treated that circulates through the bed of disordered material (3) in the first tank (1) is mixed with a rejection current from the filtration from the second tank (2), the latter, accesses to the first tank (1) through the overflow (9) that distributes it homogeneously at the upper end (1.1) of the first tank (1).
  • This rejection stream turns out to be a second portion of the effluent resulting from anaerobic digestion in the first reservoir (1) that has circulated through the second reservoir (2) but has not been filtered by the membrane modules (4).
  • the growth of adhered biomass and the filter effect of the bed of disordered material (3) allows the accumulation of active biomass in the digestion zone, that is, in the first tank (1), while mixing wastewater and rejection water to be filtered, it circulates downwards through said first tank (1) by the gas-lift effect induced in the second tank (2), reducing the concentration of suspended solids that pass to the second filtration tank (2), which increases the efficiency and effectiveness of the membrane modules (4) and reduces their fouling.
  • the downward flow of the mixture of wastewater and rejection water gently agitates the bed of disordered material (3), minimizing the formation of dead zones by accumulation of biogas or carbon dioxide (CO2) generated and / or starches of biomass detached from the surface of the messy material (3).
  • a second stream of gas (b2) either air or other gas containing oxygen (O2), or inert gas for anaerobic digestion, according to the biological treatment applied, is injected under the bed of disordered material (3), so as to momentarily agitate said bed of disordered material (3).
  • the second gas stream (b2) is air or another gas containing oxygen (0 2 ), or inert gas to Anaerobic digestion respectively from an external source (15) to the installation, as shown in Figures 2 and 4.
  • the injection of the second gas stream (b2) could be for less than one minute once or twice a day or week, depending on the mass of suspended solids retained by bed of messy material (3).
  • the bed of untidy material (3) inside the first tank (1) must occupy a volume that allows the contact time of the residual water with the retained biomass on the surface of the disordered material to be adequate for the correct development.
  • the biological process carried out in the first tank (1) for example, in the case of anaerobic treatment, between 12 hours and 48 hours, depending on the concentration of organic matter (pollutant), as well as the proportions of oils and fats, suspended solids, slowly biodegradable materials, salinity, temperature, among other specific characteristics of the wastewater to be treated.
  • the installation allows to achieve yields of elimination of organic matter (contaminant) of between 94% and 98%, operating with organic loading speeds of up to 7 kilograms of COD (chemical oxygen demand) at day per cubic meter of reactor, with biogas production between 330 and 370 liters of methane (CH 4 ) per kilogram of COD.
  • the biogas not used in the installation leaves it through the biogas outlet (1 1), which is in communication with the upper end (1 .1) of the first tank (1) and / or with the upper end (2.1) of the second tank (2).
  • the installation may comprise pumping means (7) of adjustable flow adapted to cause, alternatively, filtration of the effluent or counter-washing of the membrane modules (4).
  • the pumping means (7) are the combination of two opposing pumps: one for filtration (7.1) and one for counter-washing (7.2) (as shown in figures 1 to 4), or, a reversible pump (not shown in the figures) that evidently performs the functions of the previous ones (7.1, 7.2).
  • the filtration pump (7.1) by suction, separates a first portion of the effluent resulting from anaerobic digestion in the first reservoir (1), which passes through the modules membrane (4) and leaves the installation through the filtered effluent outlet (10).
  • the second portion of the effluent resulting from anaerobic digestion in the first reservoir (1) that was introduced into the second reservoir (2) through its lower end (2.2) and which does not pass through the membrane modules (4) is the so-called rejection current, which returns to the first tank (1) through the overflow (9).
  • a tank of permeate (8) adapted to remain full and retain a sufficient amount of filtered water to effect the counter-washing of the membrane modules (4) by means of the backwash pump (7.2).
  • the anti-washing pump (7.2) take filtered water from the permeate tank (8) to introduce it into the membrane modules (4) in the opposite direction to the filtration, recovering to a large extent the permeability of its membranes.
  • a metering pump (13) add to the water used in the anti-wash at least one chemical reagent (chemical anti-wash), contained in a tank (14), to eliminate both organic and inorganic fouling.
  • the chemical reagent added to the counter-wash could be soda, citric oxalic or other weak acid, or sodium hypochlorite (NaCIO), in a proportion between 5 mg / L and 50 mg / L, in order to increase the effectiveness of the anti-wash

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

L'invention concerne une installation de traitement d'eaux résiduelles qui comprend un premier réservoir de traitement biologique rempli d'un matériau désordonné conçu pour former un lit avec une extension de surface sur laquelle adhèrent des micro-organismes qui traitent biologiquement l'eau résiduelle, et un second réservoir de filtration qui contient des modules à membrane immergée de microfiltration ou d'ultrafiltration, le premier réservoir et le second réservoir communiquant entre eux au niveau des extrémités supérieures respectives comme au niveau des extrémités inférieures respectives, et le second réservoir est conçu pour être agité avec un gaz injecté sous les modules à membrane, créant un effet d'ascension par poussée de gaz qui fait circuler l'eau résiduelle de manière descendante dans le premier réservoir et un effluent issu du traitement dans ledit premier réservoir circulaire de manière ascendante dans le second réservoir.
PCT/ES2019/070061 2018-02-08 2019-02-06 Installation de traitement d'eaux résiduelles Ceased WO2019155105A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201830110A ES2722277B2 (es) 2018-02-08 2018-02-08 Instalación de tratamiento de aguas residuales
ESP201830110 2018-02-08

Publications (1)

Publication Number Publication Date
WO2019155105A1 true WO2019155105A1 (fr) 2019-08-15

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PCT/ES2019/070061 Ceased WO2019155105A1 (fr) 2018-02-08 2019-02-06 Installation de traitement d'eaux résiduelles

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ES (1) ES2722277B2 (fr)
WO (1) WO2019155105A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112661349A (zh) * 2020-12-03 2021-04-16 河北化工医药职业技术学院 一种环境工程用水污染处理装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2930064B2 (es) * 2021-06-03 2023-04-12 Univ Burgos Instalación para el tratamiento de aguas residuales

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0861808A2 (fr) * 1997-02-28 1998-09-02 Kuraray Co., Ltd. Installation de traitement des eaux usées
ES2213461A1 (es) * 2002-07-31 2004-08-16 Universidad De Cantabria Sistema mixto para la depuracion biologica de aguas residuales combinando biopeliculas y membranas de filtracion.
WO2011130089A1 (fr) * 2010-04-12 2011-10-20 Veolia Water Solutions & Technologies Support Bioréacteur à membrane ayant des conduites de liqueur mixte et d'air dans un réservoir de filtration

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0861808A2 (fr) * 1997-02-28 1998-09-02 Kuraray Co., Ltd. Installation de traitement des eaux usées
ES2213461A1 (es) * 2002-07-31 2004-08-16 Universidad De Cantabria Sistema mixto para la depuracion biologica de aguas residuales combinando biopeliculas y membranas de filtracion.
WO2011130089A1 (fr) * 2010-04-12 2011-10-20 Veolia Water Solutions & Technologies Support Bioréacteur à membrane ayant des conduites de liqueur mixte et d'air dans un réservoir de filtration

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112661349A (zh) * 2020-12-03 2021-04-16 河北化工医药职业技术学院 一种环境工程用水污染处理装置

Also Published As

Publication number Publication date
ES2722277A1 (es) 2019-08-08
ES2722277B2 (es) 2020-03-03

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