ES2562379B2 - Method and system of autotrophic removal of nitrogen in wastewater by biofiltration in a fixed bed - Google Patents
Method and system of autotrophic removal of nitrogen in wastewater by biofiltration in a fixed bed Download PDFInfo
- Publication number
- ES2562379B2 ES2562379B2 ES201531526A ES201531526A ES2562379B2 ES 2562379 B2 ES2562379 B2 ES 2562379B2 ES 201531526 A ES201531526 A ES 201531526A ES 201531526 A ES201531526 A ES 201531526A ES 2562379 B2 ES2562379 B2 ES 2562379B2
- Authority
- ES
- Spain
- Prior art keywords
- granular particles
- nitrogen
- influent
- fixed bed
- wastewater
- 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.)
- Active
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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
Abstract
Método y sistema de eliminación autotrófica de nitrógeno en aguas residuales mediante biofiltración en lecho fijo. Consiguen la eliminación de nitrógeno en un influente de aguas residuales con un contenido de nitrógeno inferior a 1500 mgN{sub,total}/L y una relación de DBO{sub,5}/Ntotal de entre 0,01 y 1 mediante un proceso biopelícula de oxidación anaerobia autotrófica en el que se hace pasar al influente por un biofiltro en lecho fijo constituido por un conjunto de partículas granulares colonizadas por bacterias AOB y bacterias ANAMMOX, teniendo dichas partículas granulares un tamaño efectivo (d{sub,10}) comprendido entre 2,0-8,0 mm y una superficie específica mínima de 800 m{sup,2}/m{sup,3}.Method and system of autotrophic removal of nitrogen in wastewater by biofiltration in a fixed bed. They achieve the elimination of nitrogen in an influent of wastewater with a nitrogen content of less than 1500 mgN {sub, total} / L and a BOD ratio {sub, 5} / Total of between 0.01 and 1 through a biofilm process of autotrophic anaerobic oxidation in which the influent is passed through a fixed bed biofilter consisting of a set of granular particles colonized by AOB bacteria and ANAMMOX bacteria, said granular particles having an effective size (d {sub, 10}) comprised between 2.0-8.0 mm and a minimum specific surface area of 800 m {sup, 2} / m {sup, 3}.
Description
55
1010
15fifteen
20twenty
2525
3030
DESCRIPCIONDESCRIPTION
Metodo y sistema de elimination autotrofica de nitrogeno en aguas residuales mediante biofiltracion en lecho fijoMethod and system of autotrophic elimination of nitrogen in wastewater by biofiltration in fixed bed
CAMPO DE LA INVENCIONFIELD OF THE INVENTION
La presente invention se refiere a un metodo y un sistema de eliminacion autotrofica de nitrogeno en aguas residuales mediante biofiltracion en lecho fijo aplicable, en particular, al tratamiento de aguas residuales con un alto contenido en Nitrogeno y un bajo contenido de materia organica tales como los retornos de la lmea de fangos de las Estaciones Depuradoras de Aguas Residuales (EDAR).The present invention relates to a method and a system of autotrophic removal of nitrogen in wastewater by means of biofiltration in a fixed bed applicable, in particular, to the treatment of wastewater with a high content of Nitrogen and a low content of organic matter such as returns of the sludge line of the Wastewater Treatment Plants (WWTP).
ANTECEDENTES DE LA INVENCIONBACKGROUND OF THE INVENTION
El nitrogeno se ha convertido en los ultimos anos en uno de los contaminantes mas importantes en las aguas residuales urbanas debido a la creciente actividad industrial y agricola sufrida en los ultimos tiempos. El vertido de aguas residuales con alto contenido en nitrogeno a los cursos superficiales de agua puede ocasionar efectos negativos sobre ellas, como la reduction de la concentration de oxigeno disuelto en las aguas receptoras, toxicidad para los microorganismos presentes en el medio acuatico, riesgos sobre la salud publica y promover el proceso de eutrofizacion de las masas de agua, por lo que la legislation en cuanto a su vertido esta siendo cada vez mas restrictiva.Nitrogen has become in recent years one of the most important pollutants in urban wastewater due to the growing industrial and agricultural activity suffered in recent times. The discharge of wastewater with high nitrogen content to surface water courses can cause negative effects on them, such as reducing the concentration of dissolved oxygen in the receiving waters, toxicity to microorganisms present in the aquatic environment, risks to water public health and promote the process of eutrophication of water bodies, so the legislation regarding its discharge is becoming increasingly restrictive.
La tecnologia mas extendida para la eliminacion de nitrogeno en aguas residuales se basa en la combination de dos procesos biologicos como son la nitrification y la desnitrificacion. El primero de ellos es realizado por un conjunto de bacterias autotrofas oxidadoras de amonio y de nitrito, mientras que el segundo es realizado por un amplio conjunto de bacterias que tienen como caracteristica comun la posibilidad de emplear nitrato o nitrito como aceptores de electrones en una cadena respiratoria, principalmente en ausencia de oxigeno. Estas caracteristicas que describen ambos procesos nos obliga a realizarlos por separado, precisando un sistema aireado para llevar a cabo la nitrificacion y otro anoxico para la desnitrificacion.The most widespread technology for the elimination of nitrogen in wastewater is based on the combination of two biological processes such as nitrification and denitrification. The first one is made by a set of ammonium and nitrite oxidizing autotrophic bacteria, while the second one is carried out by a wide set of bacteria that have as a common feature the possibility of using nitrate or nitrite as electron acceptors in a chain respiratory, mainly in the absence of oxygen. These characteristics that describe both processes oblige us to perform them separately, requiring an aerated system to carry out nitrification and another anoxic for denitrification.
55
1010
15fifteen
20twenty
2525
3030
Sin embargo, y pese a que el proceso de nitrificacion-desnitrificacion ha demostrado tener una viabilidad tecnica suficiente, presenta un gran inconveniente: el alto consumo de oxigeno necesario para realizar el proceso de nitrificacion propiamente dicho y que incrementa los costes de explotacion del sistema, y ademas requiere la presencia de suficiente cantidad de materia organica, co-sustrato del proceso de desnitrificacion heterotrofo, y que a veces supone una limitation tecnica.However, and despite the fact that the nitrification-denitrification process has demonstrated sufficient technical feasibility, it has a great drawback: the high oxygen consumption necessary to carry out the nitrification process itself and that increases the operating costs of the system, and also requires the presence of sufficient amount of organic matter, co-substrate of the heterotrophic denitrification process, and that sometimes involves a technical limitation.
La evolution de la tecnica de depuration, el objetivo de reducir el consumo energetico y los costes del proceso de depuracion, y la necesidad de eliminar nitrogeno de las aguas residuales, han favorecido el desarrollo de novedosos procesos de elimination de nitrogeno, como son los sistemas autotroficos de eliminacion de nitrogeno, los cuales presentan importantes ventajas con respecto a los sistemas convencionales.The evolution of the depuration technique, the objective of reducing energy consumption and the costs of the purification process, and the need to remove nitrogen from wastewater, have favored the development of novel nitrogen elimination processes, such as systems Autotrophic nitrogen removal, which have important advantages over conventional systems.
Un aspecto muy importante a tener en cuenta en los procedimientos de eliminacion de nitrogeno en las Estaciones Depuradoras de Aguas Residuales (EDAR) son los retornos de la lmea de fangos (procedentes basicamente del espesamiento, la deshidratacion y el secado de fangos, en su caso), especialmente en plantas que disponen de digestion anaerobia, ya que suponen una elevada carga adicional de nitrogeno y fosforo que condiciona el diseno e incrementa los consumos energeticos. El proceso de digestion anaerobia produce un incremento del contenido de amonio y de fosforo soluble, debido a que se hidroliza gran parte del nitrogeno organico contenido en el fango, y se solubiliza el fosforo asimilado biologicamente. Las formas solubles de nitrogeno (amonio NH4+) y fosforo (ortofosfatos PO43") no son retenidos en el proceso de deshidratacion, pasando en muy alta concentration a la corriente de retornos que se envia a cabecera de planta. En el caso de existir secado termico se produce ademas la volatilization del amonio, que posteriormente es recuperado en el condensado. Ademas, la inclusion de procesos avanzados de hidrolisis para la mejora del rendimiento de la digestion anaerobia, producira un incremento proporcional de la hidrolisis del nitrogeno organico, aumentando la carga de amonio en el retorno. La sobrecarga de N correspondiente a los retornos se cuantifica entre un 10-20% sobre la carga de entrada a planta.A very important aspect to take into account in the nitrogen removal procedures in the Wastewater Treatment Plants (WWTP) are the returns of the sludge line (basically from thickening, dehydration and sludge drying, where appropriate ), especially in plants that have anaerobic digestion, since they suppose a high additional load of nitrogen and phosphorus that conditions the design and increases the energetic consumption. The anaerobic digestion process produces an increase in the content of ammonium and soluble phosphorus, because a large part of the organic nitrogen contained in the sludge is hydrolyzed, and the biologically assimilated phosphorus is solubilized. The soluble forms of nitrogen (NH4 + ammonium) and phosphorus (PO43 "orthophosphates) are not retained in the dehydration process, passing in a very high concentration to the flow of returns that is sent to the plant head. In the case of thermal drying In addition, the volatilization of ammonium occurs, which is subsequently recovered in the condensate, and the inclusion of advanced hydrolysis processes to improve the performance of anaerobic digestion will produce a proportional increase in the hydrolysis of organic nitrogen, increasing the loading of ammonium in the return The N overload corresponding to the returns is quantified between 10-20% on the plant entrance charge.
Todos estos retornos contienen muy baja concentracion de materia organica facilmente biodegradable, debido a que procede de un proceso de digestion anaerobia, por lo que elAll these returns contain very low concentration of easily biodegradable organic matter, because it comes from an anaerobic digestion process, so the
55
1010
15fifteen
20twenty
2525
3030
proceso convencional de nitrificacion-desnitrificacion se complica, pudiendo precisar aporte de materia organica adicional (metanol, acetato...).Conventional nitrification-denitrification process is complicated, and may require additional organic matter (methanol, acetate ...).
Sin embargo, estas caracteristicas del retorno de fangos, de elevada carga de nitrogeno y baja presencia de materia organica, son las condiciones idoneas que se precisan en los modernos sistemas de elimination autotrofica de nitrogeno que consisten en una nitrificacion parcial, donde se transforma el 50% del amonio en nitrito, y posteriormente una desnitrificacion autotrofica donde las bacterias ANAMMOX (iniciales de la expresion inglesa, ANaerobic AMMonium OXidation) toman el amonio restante y el nitrito producido y lo transforman directamente en nitrogeno molecular bajo condiciones anaerobicas y sin requerimientos de materia organica.However, these characteristics of the return of sludge, of high nitrogen load and low presence of organic matter, are the ideal conditions that are required in modern systems of autotrophic removal of nitrogen that consist of a partial nitrification, where 50 % of the ammonium in nitrite, and then an autotrophic denitrification where ANAMMOX bacteria (initials of the English expression, ANaerobic AMMonium OXidation) take the remaining ammonium and nitrite produced and transform it directly into molecular nitrogen under anaerobic conditions and without organic matter requirements .
- Etapa de nitrificacion parcial:- Partial nitrification stage:
NH4 +1.50 2 NilrosomasNH4 +1.50 2 Nilrosomes
■*N02 +2C02 +3H20■ * N02 + 2C02 + 3H20
- Etapa de desnitrificacion autotrofica:- Autotrophic denitrification stage:
NH^+N02 P'^ctomycetales >N 2H QNH ^ + N02 P '^ ctomycetales> N 2H Q
Los sistemas autotroficos de eliminacion de nitrogeno proporcionan importantes ventajas con respecto a los sistemas convencionales. Entre ellas cabe destacar el incremento de eliminacion de nitrogeno a un menor coste, debido entre otras cosas al menor requerimiento de aireacion puesto que solo se necesita de una nitrificacion parcial del 50% del nitrogeno a eliminar. Ademas, no se requiere de dosificacion de materia organica ni de recirculation interna debido a que no se precisa de materia organica durante el proceso de desnitrificacion. Todo esto supone un ahorro energetico que se puede estimar en 2,8 kWh/kg N y en un ahorro en la adicion de materia organica (3 kg metanol/kg N).Autotrophic nitrogen removal systems provide important advantages over conventional systems. These include the increase in nitrogen removal at a lower cost, due among other things to the lower aeration requirement since only a partial nitrification of 50% of the nitrogen to be eliminated is needed. In addition, no dosage of organic matter or internal recirculation is required because no organic matter is required during the denitrification process. All this means an energy saving that can be estimated at 2.8 kWh / kg N and a saving in the addition of organic matter (3 kg methanol / kg N).
Dentro de los sistemas autotroficos de eliminacion de nitrogeno el conocido como ANITATMMox esta basado en un sistema de reactor biologico en lecho movil (MBBR- Moving Bed Biological Reactor) desarrollado espedficamente para el tratamiento de efluentes con alta carga de amonio. Este sistema emplea soportes plasticos colonizados con bacterias ANAMMOX. La eliminacion de amonio se realiza en un unico reactor que contiene los soportes plasticos donde se desarrollan en forma de biopelicula las bacterias productoras de nitrito ademas de la biomasa ya colonizada por bacterias ANAMMOX. LaWithin the autotrophic nitrogen removal systems known as ANITATMMox, it is based on a mobile bed biological reactor system (MBBR-Moving Bed Biological Reactor) specifically developed for the treatment of effluents with a high ammonium charge. This system uses plastic supports colonized with ANAMMOX bacteria. The elimination of ammonium is carried out in a single reactor that contains the plastic supports where nitrite producing bacteria are developed in a biofilm in addition to the biomass already colonized by ANAMMOX bacteria. The
44
55
1010
15fifteen
20twenty
2525
3030
formation de esta biopeKcula permite alcanzar las condiciones aerobicas y anoxicas necesarias para eliminar el amonio de manera eficiente en una sola etapa.formation of this biopeKcula allows to reach the aerobic and anoxic conditions necessary to remove ammonium efficiently in a single stage.
Entre los inconvenientes del sistema ANITA™Mox cabe senalar los siguientes:Among the disadvantages of the ANITA ™ Mox system, the following should be noted:
- Implica una gran inversion.- It implies a great investment.
- Solo tiene colonizadas bacterias ANAMMOX.- You only have ANAMMOX bacteria colonized.
- Requiere un sistema de agitation con el consiguiente coste gasto energetico.- Requires a system of agitation with the consequent cost of energy expenditure.
- Necesita un sistema de rejillas para evitar perdidas de soportes del reactor.- You need a grid system to avoid losses of reactor supports.
La presente invention esta dirigida a la solution de esos inconvenientes.The present invention is directed to the solution of these inconveniences.
SUMARIO DE LA INVENCIONSUMMARY OF THE INVENTION
En un aspecto la invencion proporciona un metodo para la elimination de nitrogeno en un influente de aguas residuales con un contenido de nitrogeno inferior a 1500 mgNtotal/L y una relation de Materia organica / Nitrogeno total, expresada en mgDBO5/mg Ntotal de entre 0,01 y 1, mediante un proceso biopelicula de oxidation anaerobia autotrofica en el que se hace pasar al influente por un biofiltro en lecho fijo constituido por un conjunto de particulas granulares colonizadas por bacterias AOB y bacterias ANAMMOX, teniendo dichas particulas granulares un tamano efectivo (d10) comprendido entre 2,0-8,0 mm y una superficie espedfica minima de 800 m2/m3.In one aspect, the invention provides a method for the elimination of nitrogen in a sewage influent with a nitrogen content of less than 1500 mg Total / L and an organic matter / Total nitrogen ratio, expressed in mg DBO5 / mg Total of between 0, 01 and 1, through an autotrophic anaerobic oxidation biopelicula process in which the influent is passed through a fixed bed biofilter consisting of a set of granular particles colonized by AOB bacteria and ANAMMOX bacteria, said granular particles having an effective size (d10 ) between 2.0-8.0 mm and a minimum specific surface area of 800 m2 / m3.
Ventajosamente dichas particulas granulares tienen un coeficiente de uniformidad (d60/d10) inferior a 1,5 y/o una porosidad comprendida entre 40 y 60% y/o una densidad comprendida entre 1100 y 1500 kg/m3.Advantageously, said granular particles have a uniformity coefficient (d60 / d10) of less than 1.5 and / or a porosity between 40 and 60% and / or a density between 1100 and 1500 kg / m3.
Con dichas particulas, la densidad aparente del conjunto de particulas granulares dispuestas en dicho lecho fijo esta comprendida entre 600 y 900 kg/m3.With said particles, the bulk density of the set of granular particles arranged in said fixed bed is between 600 and 900 kg / m3.
Ventajosamente dichas particulas granulares estan hechas de arcilla expandida.Advantageously said granular particles are made of expanded clay.
En otro aspecto, la invencion proporciona un sistema para eliminacion de nitrogeno en un influente de aguas residuales con un contenido de nitrogeno nitrogeno inferior a 1500 mgNtotal/L y una relacion de DBO5/Ntotal de entre 0,01 y 1, mediante un reactor biologicoIn another aspect, the invention provides a system for nitrogen removal in a wastewater influent with a nitrogen nitrogen content of less than 1500 mg Total / L and a BOD5 / Total ratio of between 0.01 and 1, by means of a biological reactor
55
1010
15fifteen
20twenty
2525
3030
en el que se lleva cabo un proceso de biopeKcula de oxidacion anaerobia autotrofica en un biofiltro en lecho fijo constituido por un conjunto de particulas granulares colonizadas por bacterias AOB y bacterias ANAMMOX, teniendo dichas particulas granulares un tamano efectivo (d10) comprendido entre 2,0-8,0 mm y una superficie espedfica mmima de 800 m2/m3. El sistema tambien comprende un subsistema de alimentacion de dicho influente al reactor biologico y un sub-sistema de salida del efluente resultante del paso de dicho influente por el reactor biologico.in which an autotrophic anaerobic oxidation biopeKcula process is carried out in a fixed bed biofilter consisting of a set of granular particles colonized by AOB bacteria and ANAMMOX bacteria, said granular particles having an effective size (d10) comprised between 2.0 -8.0 mm and a specific surface area of 800 m2 / m3. The system also comprises a feed subsystem of said influent to the biological reactor and an effluent output sub-system resulting from the passage of said influent through the biological reactor.
Tambien se contemplan medios para controlar que en el reactor biologico se cumpla una o mas de las siguientes condiciones operativas: un contenido de oxigeno del influente menor de 2 mg/l, una temperatura de funcionamiento preferentemente entre 30 y 35°C, un tiempo de retencion hidraulico del biofiltro en lecho fijo comprendido entre 6 h y 18 h, un pH comprendido preferentemente entre 6,5 y 8,0.Means are also contemplated for controlling that one or more of the following operating conditions are met in the biological reactor: an influent oxygen content of less than 2 mg / l, an operating temperature preferably between 30 and 35 ° C, a time of Hydraulic retention of the fixed bed biofilter between 6 h and 18 h, a pH preferably between 6.5 and 8.0.
Otras caracteristicas y ventajas de la presente invention se desprenderan de la description detallada que sigue de realizaciones ilustrativas de su objeto en relation con las figuras que se acompanan.Other features and advantages of the present invention will be apparent from the following detailed description of illustrative embodiments of its object in relation to the accompanying figures.
BREVE DESCRIPCION DE LOS DIBUJOSBRIEF DESCRIPTION OF THE DRAWINGS
La Figura 1 es un diagrama esquematico ilustrativo de un sistema de elimination autotrofica de nitrogeno en aguas residuales con un alto contenido en nitrogeno y un bajo contenido de materia organica segun la invencion.Figure 1 is an illustrative schematic diagram of an autotrophic nitrogen removal system in wastewater with a high nitrogen content and a low content of organic matter according to the invention.
La Figura 2 es una foto de un conjunto de particulas utilizadas como soportes del material biologico en el biofiltro utilizado en dicho sistema.Figure 2 is a photo of a set of particles used as supports of the biological material in the biofilter used in said system.
DESCRIPCION DETALLADA DE LA INVENCIONDETAILED DESCRIPTION OF THE INVENTION
Al igual que el sistema ANITATMMox el sistema objeto de la presente invencion es un sistema autotrofico de eliminacion de nitrogeno en aguas residuales con un alto contenido en nitrogeno y un bajo contenido de materia organica como, particularmente, los retornos de la lmea de fangos de las Estaciones Depuradoras de Aguas Residuales (EDAR).El proceso tiene lugar en un unico reactor.Like the ANITATMMox system, the system object of the present invention is an autotrophic system for the elimination of nitrogen in wastewater with a high nitrogen content and a low content of organic matter such as, in particular, the sludge line returns of the Wastewater Treatment Plants (WWTP). The process takes place in a single reactor.
55
1010
15fifteen
20twenty
2525
3030
En concreto, se considera que el sistema es aplicable a aguas residuales con un contenido de nitrogeno inferior a 1500 mgNtotal/L y una relacion de Materia organica / Nitrogeno total, expresada en mgDBO5/mg Ntotal de entre 0,01 y 1.Specifically, it is considered that the system is applicable to wastewater with a nitrogen content of less than 1500 mgNtotal / L and an organic matter / Total nitrogen ratio, expressed in mgDBO5 / mg mg of between 0.01 and 1.
A diferencia del sistema ANITA™Mox, el sistema de la invention esta basado en llevar a cabo el proceso de elimination autotrofica del nitrogeno mediante el paso de un influente con las caracteristicas mencionadas por un biofiltro en lecho fijo.Unlike the ANITA ™ Mox system, the system of the invention is based on carrying out the process of autotrophic removal of nitrogen through the passage of an influent with the characteristics mentioned by a fixed bed biofilter.
En la realization ilustrada en la Figura 1, el sistema comprende:In the embodiment illustrated in Figure 1, the system comprises:
- Un reactor biologico 11 con un biofiltro de lecho fijo 13.- A biological reactor 11 with a fixed bed biofilter 13.
- Un sub-sistema de alimentation del reactor biologico 11 que comprende un deposito de influente 17 conectado con el reactor biologico 11 por una tuberia principal 19 y una bomba de piston 25 para impulsar el influente de manera que atraviese el reactor biologico 11 de abajo a arriba. Este subsistema ira provisto de las necesarias valvulas de regulation en dicha tuberia.- A sub-system for feeding the biological reactor 11 comprising an influent reservoir 17 connected to the biological reactor 11 by a main pipe 19 and a piston pump 25 to drive the influent so that it crosses the biological reactor 11 from below to above. This subsystem will be provided with the necessary regulation valves in said pipe.
- Un deposito de reactivo 21 (para controlar el pH del influente) conectado con la tuberia principal 19 a traves de una tuberia secundaria 23 y una bomba de piston 27 para impulsar el reactivo.- A reagent tank 21 (to control the pH of the influent) connected to the main pipe 19 through a secondary pipe 23 and a piston pump 27 to drive the reagent.
- Un sub-sistema de salida del efluente resultante del paso del influente por el reactor biologico 11 que comprende una tuberia de salida 29 con un sifon 31 en su parte inicial y un deposito de efluente 33.- An effluent outlet sub-system resulting from the passage of the influent through the biological reactor 11 comprising an outlet pipe 29 with a siphon 31 in its initial part and an effluent tank 33.
- Un sub-sistema de lavado del biofiltro de lecho fijo 13 que comprende una bomba de lavado 35 conectada con el reactor biologico 11 a traves de una tuberia de lavado 37 con una valvula de regulacion.- A washing system of the fixed bed biofilter 13 comprising a washing pump 35 connected to the biological reactor 11 through a washing pipe 37 with a regulating valve.
- Medios adicionales, incluyendo un compresor de aire 41 y una valvula de seguridad 43.- Additional means, including an air compressor 41 and a safety valve 43.
El biofiltro de lecho fijo 13 comprende como soporte un conjunto de particulas granulares y como material biologico bacterias AOB (iniciales de la expresion inglesa Ammonia Oxidizing Bacteria) y bacterias ANAMMOX. Esas bacterias colonizan las superficies de dichas particulas granulares y permiten que pueda llevarse a cabo el proceso de oxidacion anaerobia autotrofica del influente.The fixed bed biofilter 13 comprises as a support a set of granular particles and as biological material AOB bacteria (initials of the English expression Ammonia Oxidizing Bacteria) and ANAMMOX bacteria. These bacteria colonize the surfaces of said granular particles and allow the autotrophic anaerobic oxidation process of the influent to be carried out.
55
1010
15fifteen
20twenty
2525
3030
Las parriculas granulares deben tener las siguientes caracteristicas:Granular grids must have the following characteristics:
- un tamano efectivo (d10) comprendido entre 2,0 - 8,0 mm.- an effective size (d10) between 2.0 - 8.0 mm.
- Un coeficiente de uniformidad (d60/d10) inferior a 1,5.Una superficie espedfica minima de 800 m2/m3.- A uniformity coefficient (d60 / d10) of less than 1.5, a minimum specific surface area of 800 m2 / m3.
- Una porosidad comprendida entre 40 y 60%.- A porosity between 40 and 60%.
- Una densidad comprendida entre 1100 y 1500 kg/m3.- A density between 1100 and 1500 kg / m3.
Con esas caracteristicas la densidad aparente del conjunto de parriculas granulares dispuestas en el biofiltro de lecho fijo 13 esta comprendida entre 600 y 900 kg/m3. Preferiblemente, las parriculas granulares estan hechas de arcilla expandida.With these characteristics the apparent density of the set of granular grids arranged in the fixed bed biofilter 13 is between 600 and 900 kg / m3. Preferably, the granular grids are made of expanded clay.
En particular, las particulas comercializadas con la denominacion FILTRALITE® MC 2,5-4 por MAXIT AS, P.O. Box 216 Alnabru, 0614 Oslo, Norway (ver Figura 2) son parriculas apropiadas para constituir el soporte del biofiltro en lecho fijo 13.In particular, particles sold under the name FILTRALITE® MC 2.5-4 by MAXIT AS, P.O. Box 216 Alnabru, 0614 Oslo, Norway (see Figure 2) are appropriate grids to constitute the fixed bed biofilter support 13.
Un conjunto de parriculas granulares con las caracteristicas senaladas proporciona un soporte compacto al biofiltro en lecho fijo 13 con un bajo nivel de huecos y un soporte con una superficie espedfica apropiada para la adherencia de las bacterias AOB y ANAMMOX.A set of granular grids with the marked characteristics provides a compact support to the fixed bed biofilter 13 with a low level of holes and a support with a specific surface suitable for the adhesion of the AOB and ANAMMOX bacteria.
Entre las condiciones operativas del proceso llevado a cabo en el reactor biologico 11 cabe destacar las siguientes:Among the operational conditions of the process carried out in the biological reactor 11, the following should be noted:
- El contenido de oxigeno del influente debe ser menor de 2,5 mg/l, preferentemente menor de 2,0 mg/l.- The oxygen content of the influent should be less than 2.5 mg / l, preferably less than 2.0 mg / l.
- La relacion NH4/NO2 optima en el influente es de aproximadamente 2,55 expresada en mg/L de cada compuesto.- The optimal NH4 / NO2 ratio in the influent is approximately 2.55 expressed in mg / L of each compound.
- La temperatura de funcionamiento (T) del reactor biologico debe mantenerse entre 10 y 40°C, preferentemente entre 30 y 35°C.- The operating temperature (T) of the biological reactor should be maintained between 10 and 40 ° C, preferably between 30 and 35 ° C.
- El tiempo de retencion hidraulico del biofiltro debera estar entre 6 h y 18 h, preferiblemente proximo a las 12 h.- The hydraulic retention time of the biofilter should be between 6 h and 18 h, preferably close to 12 h.
55
1010
15fifteen
20twenty
2525
- El pH debera mantenerse en todo momento entre 6,0 y 9,5 preferentemente entre 6,5 y 8,0 para lo cual se han previsto los medios necesarios de dosificacion de reactivos- The pH should be maintained at all times between 6.0 and 9.5, preferably between 6.5 and 8.0, for which the necessary means of reagent dosing are provided.
Con independencia de las condiciones operativas indicadas, los experimentos realizados han permitido establecer que el sistema no presenta reducciones en cuanto al rendimiento del proceso siempre y cuando las concentraciones de amonio se mantengan por debajo de 1000 mg n-NH4/l. Igualmente se ha podido determinar que las concentraciones de nitrito maximo admisible varian en funcion del tipo de bacterias Anammox, pero en cualquier caso, para valores inferiores a 180 mg/l aproximadamente no se detectaron reducciones en el rendimiento del sistema. Las concentraciones de nitrato empiezan a inhibir el proceso, reduciendo los rendimientos de elimination, a partir de aproximadamente 650 mg/l.Regardless of the indicated operating conditions, the experiments carried out have allowed us to establish that the system does not show any reductions in the performance of the process as long as the ammonium concentrations are maintained below 1000 mg n-NH4 / l. It has also been possible to determine that the maximum permissible nitrite concentrations vary depending on the type of Anammox bacteria, but in any case, for values below 180 mg / l approximately no reductions in system performance were detected. Nitrate concentrations begin to inhibit the process, reducing elimination yields, from approximately 650 mg / l.
Al igual que ocurre con el sistema ANITA™Mox, la production de fangos quimicos puede considerarse despreciable. La produccion de fangos biologicos es reducida y los mismos son retirados por medio del contralavado periodico del biofiltro cuando se haya producido la colmatacion del mismo. La velocidad y frecuencia del lavado dependera fundamentalmente de las cargas influentes.As with the ANITA ™ Mox system, chemical sludge production can be considered negligible. The production of biological sludge is reduced and they are removed by means of the periodic backwashing of the biofilter when the filling of the same has occurred. The speed and frequency of the washing will depend fundamentally on the influential loads.
EjemplosExamples
En la siguiente TABLA se muestran los resultados del rendimiento de eliminacion de nitrogeno total (REND) obtenidos en 8 ejemplos de utilization de sistema de la invention variando el tiempo de retention hidraulico (TRH), la temperatura (T), el contenido de oxigeno en el influente (OD) y el pH.The following TABLE shows the results of the total nitrogen elimination performance (REND) obtained in 8 examples of system utilization of the invention varying the hydraulic retention time (TRH), the temperature (T), the oxygen content in the influent (OD) and the pH.
- TRH (h) T (°C) OD (mg/L) pH REND (%) HRT (h) T (° C) OD (mg / L) pH REND (%)
- Ejemplo 1 Example 1
- 12 35 0 8 60 12 35 0 8 60
- Ejemplo 2 Example 2
- 12 35 1 7,5 75 12 35 1 7.5 75
- Ejemplo 3 Example 3
- 12 35 2 7 92 12 35 2 7 92
- Ejemplo 4 Example 4
- 12 35 2,3 7 92 12 35 2.3 7 92
- Ejemplo 5 Example 5
- 12 20 2 6,8 20 12 20 2 6.8 20
- Ejemplo 6 Example 6
- 12 25 2 6,9 40 12 25 2 6.9 40
- Ejemplo 7 Example 7
- 12 28 2 7 70 12 28 2 7 70
- Ejemplo 8 Example 8
- 7 35 2 7 85 7 35 2 7 85
Entre las ventajas de la invention respecto al sistema ANITATMMox cabe senalar las siguientes:Among the advantages of the invention over the ANITATMMox system, the following should be noted:
5 - Menor consumo energetico porque no requiere agitation.5 - Lower energy consumption because it does not require agitation.
- No necesidad de un sistema de rejillas para evitar que los soportes del material biologico se salgan del reactor al tratarse un proceso de biofiltracion sobre lecho fijo.- No need for a grid system to prevent the supports of the biological material from leaving the reactor when treating a biofiltration process on a fixed bed.
- Soportes colonizados con bacterias AOB y ANAMMOX.- Colonized supports with AOB and ANAMMOX bacteria.
10 - Menor tamano del reactor ya que soporte del material biologico ocupa mucho10 - Smaller reactor size since biological material support occupies a lot
menos espacio.less space.
- Mejora de la eficiencia del proceso ya que el biofitro proporciona mucha superficie espedfica que permite una mayor concentration de biomasa con lo que se mejora la principal limitation de la oxidation anaerobia autotrofica que es su baja velocidad- Improvement of the efficiency of the process since the biofitro provides a lot of specific surface that allows a greater concentration of biomass, which improves the main limitation of the autotrophic anaerobic oxidation which is its low speed
15 de tratamiento.15 of treatment.
Aunque se ha descrito la presente invencion en conexion con varias realizaciones, puede apreciarse a partir de la description que pueden hacerse varias combinaciones de elementos, variaciones o mejoras en ellas y que estan dentro del alcance de la invencionAlthough the present invention has been described in connection with various embodiments, it can be seen from the description that various combinations of elements, variations or improvements can be made therein and that are within the scope of the invention
20 definido en las reivindicaciones adjuntas.20 defined in the appended claims.
Claims (13)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES201531526A ES2562379B2 (en) | 2015-10-23 | 2015-10-23 | Method and system of autotrophic removal of nitrogen in wastewater by biofiltration in a fixed bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES201531526A ES2562379B2 (en) | 2015-10-23 | 2015-10-23 | Method and system of autotrophic removal of nitrogen in wastewater by biofiltration in a fixed bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2562379A1 ES2562379A1 (en) | 2016-03-03 |
| ES2562379B2 true ES2562379B2 (en) | 2016-09-30 |
Family
ID=55400950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES201531526A Active ES2562379B2 (en) | 2015-10-23 | 2015-10-23 | Method and system of autotrophic removal of nitrogen in wastewater by biofiltration in a fixed bed |
Country Status (1)
| Country | Link |
|---|---|
| ES (1) | ES2562379B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111333188B (en) * | 2020-03-27 | 2021-05-04 | 中国科学院广州地球化学研究所 | Tide-composite flow biological filter for stably realizing anaerobic ammonia oxidation denitrification of domestic sewage |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114684913B (en) * | 2020-12-31 | 2023-02-03 | 中国石油化工股份有限公司 | Anaerobic biological filter and sewage treatment method thereof |
-
2015
- 2015-10-23 ES ES201531526A patent/ES2562379B2/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111333188B (en) * | 2020-03-27 | 2021-05-04 | 中国科学院广州地球化学研究所 | Tide-composite flow biological filter for stably realizing anaerobic ammonia oxidation denitrification of domestic sewage |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2562379A1 (en) | 2016-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102775027B (en) | Granular sludge integrated autotrophic nitrogen removal device and operating method thereof | |
| CN201756490U (en) | Continuous-flow sewage low-oxygen short-range denitrification treatment device | |
| CN103910463B (en) | Novel process for BC urban sewage treatment | |
| CN103086568B (en) | Continuous flow urban sewage partial nitrification and anaerobic ammonia oxidation denitrification method | |
| CN106745743B (en) | Sewage nitrogen and phosphorus removal system | |
| CN104556572A (en) | Efficient biochemical nitrogen and phosphorus removal method for waste water | |
| CN109574224B (en) | Livestock and poultry wastewater treatment system and method | |
| CN101767910A (en) | Continuous flow sewage hypoxia short distance denitrification treating technique | |
| CN101723510A (en) | Preliminary dexidation-anaerobism-oxygen deficit-multistage aerobic/anaerobic biological N and P removing method and device | |
| CN103601341A (en) | SBR (Sequencing Batch Reactor) and SBBR (Sequencing Biofilm Batch Reactor) municipal sewage high-efficiency biological treatment method and device based on anaerobic ammonia oxidation | |
| CN104512964B (en) | A kind of method realizing municipal effluent short-cut denitrification based on the process of mud side | |
| CN104528938A (en) | Method for starting SNAD process based on non-woven fabric ring packing | |
| CN105217890A (en) | A is strengthened based on DEAMOX 2the apparatus and method of/O+ Biological Contact Oxidation Process biological carbon and phosphorous removal | |
| CN105384247A (en) | Method for oxidizing and denitrifying part of denitrification coupled anaerobic ammonia through A/O biological membrane process | |
| CN102557258B (en) | Improved integrated sewage treatment device | |
| CN105129989A (en) | Process method of MBBR (Moving Bed Biofilm Reactor) for treating urban sewage | |
| CN103951059A (en) | Multi-cycle composite bioreactor and process thereof | |
| CN104529056A (en) | Method for realizing autotrophic nitrogen removal of city sewage through symbiosis of flocculent sludge and granular sludge | |
| CN112110615A (en) | Upgrading and reforming treatment process and system for urban sewage plant | |
| CN105084536A (en) | Biologically enhanced treatment method for medium-and-low concentration ammonia-nitrogen wastewater | |
| CN103613196B (en) | Integrated biological denitrification device and method for treating wastewater by using same | |
| ES2562379B2 (en) | Method and system of autotrophic removal of nitrogen in wastewater by biofiltration in a fixed bed | |
| Udert et al. | Biological nitrogen conversion processes | |
| CN103641241A (en) | Preposed denitrification aeration biofilter and method for treating sewage | |
| CN203593686U (en) | Anammox-based SBR+SBBR urban highly-effective wastewater biological treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG2A | Definitive protection |
Ref document number: 2562379 Country of ref document: ES Kind code of ref document: B2 Effective date: 20160930 |
|
| PC2A | Transfer of patent |
Owner name: SACYR AGUA, S. L Effective date: 20220614 |
|
| PC2A | Transfer of patent |
Owner name: SACYR AGUA, S. L Effective date: 20220624 |