The work presented in this thesis leads to the formulation of a dynamic mathematical model of an immersed membrane bioreactor (iMBR) for wastewater treatment. This thesis is organised into three parts, each one describing a different set of tasks associated with model development and simulation. In the first part, the Author qualitatively and quantitatively compares various published activated sludge models, i.e. models of biochemical processes associated with bacterial growth, decay, lysis and substrate utilisation in activated sludge systems. As the thesis is focused on modelling membrane bioreactors (MBRs) which are known to experience membrane fouling as a result of adsorption of biopolymers present in the bulk liquid onto and within the membrane, all activated sludge models considered in this thesis are able to predict, with various levels of accuracy, the concentrations of biopolymeric substances, namely soluble microbial products (SMP) and extracellular polymeric substances (EPS). Some of the published activated sludge models dedicated to modelling SMP and EPS kinetics in MBR systems were unable to predict the SMP and EPS concentrations with adequate levels of accuracy, without compromising the predictions of other sludge and wastewater constituents. In other cases, the model equations and the assumptions made by their authors were questionable. Hence, two new activated sludge models with SMP and EPS as additional components have been formulated, described, and simulated. The first model is based on the Activated Sludge Model No. 1 (ASM1) whereas the second model is based on the Activated Sludge Model No. 3 (ASM3). Both models are calibrated on two sets of data obtained from a laboratory-scale system and a full-scale system and prove to be in very good agreement with the measurements. The second part of this thesis explains the development of two membrane fouling models. These models are set to describe the loss of membrane permeability during filtration of various solutions and suspensions. The main emphasis is placed on filtration of activated sludge mixtures, however the models are designed to be as general as feasibly possible. As fouling is found to be caused by a large number of often very complex processes which occur at different spatial as well as temporal scales, the two fouling models developed here have to consider a number of significant simplifications and assumptions. These simplifications are required to balance the model's accuracy, generality and completeness with its usability in terms of execution times, identifiability of parameters and ease of implementation in general purpose simulators. These requirements are necessary to ascertain that long term simulations as well as optimisation and sensitivity studies performed in this thesis either individually on fouling models or on the complete model of a MBR can be carried out within realistic time-scales. The first fouling model is based on an idea that fouling can be subdivided into just two processes: short-term reversible fouling and long-term irreversible fouling. These two processes are described with two first order ordinary differential equations (ODEs). Whilst the first model characterises the membrane filtration process from an observer's input-output point of view without any rigorous deterministic description of the underlying mechanisms of membrane fouling, the second model provides a more theoretical and in-depth description of membrane fouling by incorporating and combining three classical macroscopic mechanistic fouling equations within a single simulation framework. Both models are calibrated on a number of experimental data and show good levels of accuracy for their designated applications and within the intended ranges of operating conditions. In the third part, the first developed biological model (CES-ASM1) is combined with the behavioural fouling model and the links between these two models are formulated to allow complete simulation of a hollow fibre (HF) immersed membrane bioreactor (iMBR). It is assumed that biological processes affect the membrane through production of mixed liquor suspended solids (MLSS), SMP and EPS which cause pore blockage, cake formation, pore diameter constriction, and affect the specific cake resistance (SCR). The membrane, on the other hand, has a direct effect on the bulk liquid SMP concentration due to its SMP rejection properties. SMP are assumed to be solely responsible for irreversible fouling, MLSS is directly linked to the amount of cake depositing on the membrane surface, whereas EPS content in activated sludge affects the cake's SCR. Other links provided in the integrated MBR model include the effects of air scouring on the rate of particle back-transport from the membrane surface and the effects of MLSS concentration on oxygen mass transfer. Although backwashing is not described in great detail, its effects are represented in the model by resetting the initial condition in the cake deposition equation after each backwash period. The MBR model was implemented in Simulink® using the plant layout adopted in the MBR benchmark model of Maere et al. [160]. The model was then simulated with the inputs and operational parameters defined in [36, 160]. The results were compared against the MBR benchmark model of Maere et al. [160] which, contrary to this work, does not take into account the production of biopolymers, the membrane fouling, nor any interactions between the biological and the membrane parts of an MBR system.

Wastewater recycling and reuse is an important issue in the coming years due to the increasing water demand and the decreasing water supply. MBR (membrane bioreactor) technology has become an important pretreatment technology for reclaiming treated effluent from, for example, domestic, dyestuff, and pharmaceutical wastewater plants. However, variations in wastewater flow rate and polluted materials can be a great influence to the performance of MBR. The applications of MBR to the treatment of various industrial wastewaters are worthy of further investigation. The present study investigated performances of MBR for treating wastewaters from a tannery plant and an industrial park. In addition, a pilot-scale UASB (upflow anaerobic sludge blanket) reactor was used for the pretreatment of the tannery plant wastewater for COD (chemical oxygen demand) removal. Results from tannery wastewater treatment indicate that using effluent from the activated sludge ponds of plant A as an influent to the pilot MBR, COD and SS (suspended solids) of the MBR filtrates could always be kept at <100 and <30 mg/L, respectively. Both COD and SS of the filtrates meet effluent regulations of <160 and <30 mg/L, respectively. The operation conditions were HRT (hydraulic retention time) = 12.2-20.4 hr, flux = 4.92-8.17 L/m2.hr, and MLSS (mixed liquor suspended solids) = 5,060-37,800 mg/L. Because the effluent had high TDS (total dissolved solids) contents of 8,700-9,700 mg/L resulted from chloride and sulfate ions, the permissible operational fluxes (4.92-8.17 L/m2.hr) were far below the normal ones (20-30 L/m2.hr). Experiments from the UASB test indicate that on an average 70% of the influent COD (2,200 mg/L) could be removed. Wastewater plant for the industrial park had influent and effluent COD of 93-144 and 11-65 mg/L, respectively. By the MBR with EBRT of 2.16-12.2 hr, flux of 5.0-28 L/m2.hr, and MLSS of 1,550 mg/L, the filtrates had COD of 11-81 mg/L. In addition, COD of the MBR filtrates could be decreased from 77 to 20-40 mg/L after supplementation of PAC (powdered activated carbon) at a concentration of 500 mg/L, and a clearer filtrate was obtained. After 30 days of operation, COD of the filtrates could be maintained at 30-48 mg/L. Regular addition of PAC to the MBR reactor is necessary for keeping the effluent quality to meet the reuse requirements.

<p>Analytical analyses conducted at the Himmerfjärden WWTP (285.000 PE connected) identified 70 pharmaceutical compounds belonging to different therapeutic classes. Such organic micropollutants at low detected concentration range of µg - ng l^-1 did not affect the treatment processes at WWTP. Results from analytical studies indicated continuous discharge of organic micropollutants to the surface water with a calculated load amounting to 1.51 kg day-1. Metoprolol, carbamazepine and naproxen were chosen for testing different removal methods. Oxygen Uptake Rate (OUR) tests were conducted to assess the bacterial activity of an activated sludge taken from a full scale aeration plant with the presence of selected target compounds.</p><p>A semi-technical scale membrane bioreactor ZeeWeed10™, treating final effluent from the Himmerfjärden WWTP (Sweden) was seeded with activated sludge from full scale biological stage. The membrane bioreactor (MBR) system placed after the final treatment appeared to be an insufficient technology for removal of residual amounts of organic micropollutants from WWTP effluents. Batch test studies with activated sludge taken from the membrane bioreactor and with application of granular activated carbon (GAC) filtration resulted in giving an overall assessment of removal efficiency. Metoprolol and carbamazepine tend to be resistant to the biodegradation process and in the dosed high concentration lead to bacterial cell decomposition in the activated sludge. Apparently, removal efficiency for naproxen exceeded the value of 46% with the spiked initial amount of 3.3 mg NAP g^-1MLSS. Application of the GAC filtration proved to be an efficient technique for removal of pharmaceutical compounds from treated wastewater.</p><p>Application of the statistical programme Modde7 was a time saving tool in studies of fouling occurrence. The effect of fouling phenomenon, which is a highly limiting factor for MBR performance, was minimised by adjusting the operational parameters as predicted by the Modde7 programme.</p>

Wastewater reuse is very important in water resource management for both environmental and economic reasons. Unfortunately, wastewater from textile industries is difficult to treat by convectional wastewater treatment technologies. Now days, polluted water due to color from textile dyeing and finishing industries is burning issue for researchers. Textile or industrial wastewaters contain non-biodegradable organic compounds, which cannot be easily biodegraded because of their complex chemical structure. Dye wastewater discharged from textile wastewaters is one example of non-biodegradable organic compounds and it is difficult to remove dye effluent by convectional wastewater treatment methods. Therefore, this thesis deals about a review of advanced treatment technologies, which can de-colorize and remove non-biodegradable organic compounds from textile wastewater effluents. In addition to this, the potential and limitation of these advanced treatment methods are reviewed. Advanced treatment technologies reviewed in this paper are; Adsorption process, Membrane bioreactor (MBR) and advanced oxidation process (AOPs).

京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第19984号 / 工博第4228号 / 新制||工||1654(附属図書館) / 33080 / 京都大学大学院工学研究科都市環境工学専攻 / (主査)教授 田中 宏明, 教授 米田 稔, 講師 山下 尚之 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

Analytical analyses conducted at the Himmerfjärden WWTP (285.000 PE connected) identified 70 pharmaceutical compounds belonging to different therapeutic classes. Such organic micropollutants at low detected concentration range of µg - ng l-1 did not affect the treatment processes at WWTP. Results from analytical studies indicated continuous discharge of organic micropollutants to the surface water with a calculated load amounting to 1.51 kg day-1. Metoprolol, carbamazepine and naproxen were chosen for testing different removal methods. Oxygen Uptake Rate (OUR) tests were conducted to assess the bacterial activity of an activated sludge taken from a full scale aeration plant with the presence of selected target compounds. A semi-technical scale membrane bioreactor ZeeWeed10™, treating final effluent from the Himmerfjärden WWTP (Sweden) was seeded with activated sludge from full scale biological stage. The membrane bioreactor (MBR) system placed after the final treatment appeared to be an insufficient technology for removal of residual amounts of organic micropollutants from WWTP effluents. Batch test studies with activated sludge taken from the membrane bioreactor and with application of granular activated carbon (GAC) filtration resulted in giving an overall assessment of removal efficiency. Metoprolol and carbamazepine tend to be resistant to the biodegradation process and in the dosed high concentration lead to bacterial cell decomposition in the activated sludge. Apparently, removal efficiency for naproxen exceeded the value of 46% with the spiked initial amount of 3.3 mg NAP g-1 MLSS. Application of the GAC filtration proved to be an efficient technique for removal of pharmaceutical compounds from treated wastewater. Application of the statistical programme Modde7 was a time saving tool in studies of fouling occurrence. The effect of fouling phenomenon, which is a highly limiting factor for MBR performance, was minimised by adjusting the operational parameters as predicted by the Modde7 programme. / QC 20101104

Made available in DSpace on 2014-06-11T19:29:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-03-19Bitstream added on 2014-06-13T19:38:24Z : No. of bitstreams: 1 bezerra_lf_me_ilha.pdf: 1874770 bytes, checksum: b6f02018abe581f4724626202c471af4 (MD5) / Universidade Estadual Paulista (UNESP) / As atividades industriais, principalmente as indústrias químicas e alimentícias que se utilizam dos processos fermentativos, geram efluentes com altas concentrações de matéria orgânica carbonácea e nitrogenada. Estas necessitam de sistemas complexos para o tratamento de suas águas residuárias, pois a emissão excessiva de nutrientes no corpo d’água pode resultar na ocorrência da eutrofização que interfere nos usos desejáveis do recurso hídrico e altera o equilíbrio ambiental. Neste sentido, o presente avaliou da remoção de matéria orgânica carbonácea e nitrogenada, bem como a determinação do fluxo crítico, em biorreator de membranas (MBR) tratando águas residuárias industriais do processo de produção de aminoácidos. Pelos resultados obtidos, constatou-se a viabilidade técnica no uso do MBR para ao tratamento dessas águas residuárias contendo 2505 mg DQO/L de material carbonáceo e 277 mg NTK/L de material nitrogenado. O biorreator foi operado com carga orgânica volumétrica de 1,91 ± 0,13 kg DQO/m³ dia e carga nitrogenada volumétrica de 0,18 ± 0,02 kg NTK/m³ dia, com recirculação interna de 4 vezes a vazão afluente. O efluente tratado apresentou concentrações médias de 59 ± 27 mg DQO/L, 0,60 ± 0,24 mg N-NH4 +/L e 20,5 ± 11,9 mg N-total/L, com eficiências médias de remoção de DQO, NTK e NT de 97,5%, 98,6% e 92,1%, respectivamente. O sistema de ultrafiltração foi testado em vários fluxos entre 25 e 37 LMH e determinou-se o fluxo crítico de 28 LMH para o sistema operando com 11,4 g/L de SST / Industrial activities, especially the chemical and food industries, that use fermentation processes, generate effluents with high concentrations of carbonaceous organic matter and nitrogen. These require complex systems to treat its wastewater, since the emission of excessive nutrients in the water body can result in the occurrence of eutrophication, which interferes with the desirable uses of water resource and changes the environmental balance. In this sense, this paper evaluated the carbonaceous organic matter and nitrogen removal as well as the determination of critical flux in membrane bioreactor (MBR) treating industrial wastewater from amino acids production. By the obtained results, it found the technical feasibility of MBR for the wastewater treatment containing 2505 mg COD / L of organic material and 277 mg TKN / L of nitrogen material. The bioreactor was operated with organic loading rate of 1.91 ± 0.13 kg COD / m³ day and nitrogen volumetric load of 0.18 ± 0,02 kg TKN / m day, with internal recirculation of 4 times. The treated effluent showed concentrations of 59 ± 27 mg COD / L, 0.60 ± 0.24 mg N-NH4 + / L and 20.5 ± 11.9 mg total N / L, with average removal efficiencies of COD , TKN and TN of 97.5%, 98.6% and 92.1%, respectively. The ultrafiltration system was tested at various flow rates between 25 and 37 LMH, to determine the critical flux of 28 LMH with the system operating at 11.4 g / L of TSS

Orientador: Tsunao Matsumoto / Banca: Milton Dall'Aglio Sobrinho / Banca: Marcelo Zaiat / Resumo: As atividades industriais, principalmente as indústrias químicas e alimentícias que se utilizam dos processos fermentativos, geram efluentes com altas concentrações de matéria orgânica carbonácea e nitrogenada. Estas necessitam de sistemas complexos para o tratamento de suas águas residuárias, pois a emissão excessiva de nutrientes no corpo d'água pode resultar na ocorrência da eutrofização que interfere nos usos desejáveis do recurso hídrico e altera o equilíbrio ambiental. Neste sentido, o presente avaliou da remoção de matéria orgânica carbonácea e nitrogenada, bem como a determinação do fluxo crítico, em biorreator de membranas (MBR) tratando águas residuárias industriais do processo de produção de aminoácidos. Pelos resultados obtidos, constatou-se a viabilidade técnica no uso do MBR para ao tratamento dessas águas residuárias contendo 2505 mg DQO/L de material carbonáceo e 277 mg NTK/L de material nitrogenado. O biorreator foi operado com carga orgânica volumétrica de 1,91 ± 0,13 kg DQO/m³ dia e carga nitrogenada volumétrica de 0,18 ± 0,02 kg NTK/m³ dia, com recirculação interna de 4 vezes a vazão afluente. O efluente tratado apresentou concentrações médias de 59 ± 27 mg DQO/L, 0,60 ± 0,24 mg N-NH4 +/L e 20,5 ± 11,9 mg N-total/L, com eficiências médias de remoção de DQO, NTK e NT de 97,5%, 98,6% e 92,1%, respectivamente. O sistema de ultrafiltração foi testado em vários fluxos entre 25 e 37 LMH e determinou-se o fluxo crítico de 28 LMH para o sistema operando com 11,4 g/L de SST / Abstract: Industrial activities, especially the chemical and food industries, that use fermentation processes, generate effluents with high concentrations of carbonaceous organic matter and nitrogen. These require complex systems to treat its wastewater, since the emission of excessive nutrients in the water body can result in the occurrence of eutrophication, which interferes with the desirable uses of water resource and changes the environmental balance. In this sense, this paper evaluated the carbonaceous organic matter and nitrogen removal as well as the determination of critical flux in membrane bioreactor (MBR) treating industrial wastewater from amino acids production. By the obtained results, it found the technical feasibility of MBR for the wastewater treatment containing 2505 mg COD / L of organic material and 277 mg TKN / L of nitrogen material. The bioreactor was operated with organic loading rate of 1.91 ± 0.13 kg COD / m³ day and nitrogen volumetric load of 0.18 ± 0,02 kg TKN / m day, with internal recirculation of 4 times. The treated effluent showed concentrations of 59 ± 27 mg COD / L, 0.60 ± 0.24 mg N-NH4 + / L and 20.5 ± 11.9 mg total N / L, with average removal efficiencies of COD , TKN and TN of 97.5%, 98.6% and 92.1%, respectively. The ultrafiltration system was tested at various flow rates between 25 and 37 LMH, to determine the critical flux of 28 LMH with the system operating at 11.4 g / L of TSS / Mestre

El reactor anaerobio de membranas sumergidas (SAnMBR) está considerado como tecnología candidata para mejorar la sostenibilidad en el sector de la depuración de aguas residuales, ampliando la aplicabilidad de la biotecnología anaerobia al tratamiento de aguas residuales de baja carga (v.g. agua residual urbana) o a condiciones medioambientales extremas (v.g. bajas temperaturas de operación). Esta tecnología alternativa de tratamiento de aguas residuales es más sostenible que las tecnologías aerobias actuales ya que el agua residual se transforma en una fuente renovable de energía y nutrientes, proporcionando además un recurso de agua reutilizable. SAnMBR no sólo presenta las principales ventajas de los reactores de membranas (i.e. efluente de alta calidad, y pocas necesidades de espacio), sino que también presenta las principales ventajas de los procesos anaerobios. En este sentido, la tecnología SAnMBR presenta una baja producción de fangos debido a la baja tasa de crecimiento de los microorganismos implicados en la degradación de la materia orgánica, presenta una baja demanda energética debido a la ausencia de aireación, y permite la generación de metano, el cual representa una fuente de energía renovable que mejora el balance energético neto del sistema. Cabe destacar el potencial de recuperación de nutrientes del agua residual bien cuando el efluente es destinado a irrigación directamente, o bien cuando debe ser tratado previamente mediante tecnologías de recuperación de nutrientes. El objetivo principal de esta tesis doctoral es evaluar la viabilidad de la tecnología SAnMBR como núcleo en el tratamiento de aguas residuales urbanas a temperatura ambiente. Por lo tanto, esta tesis se centra en las siguientes tareas: (1) implementación, calibración y puesta en marcha del sistema de instrumentación, control y automatización requerido; (2) identificación de los parámetros de operación clave que afectan al proceso de filtración; (3) modelación y simulación del proceso de filtración; y (4) desarrollo de estrategias de control para la optimización del proceso de filtración minimizando los costes de operación. En este trabajo de investigación se propone un sistema de instrumentación, control y automatización para SAnMBR, el cual fue esencial para alcanzar un comportamiento adecuado y estable del sistema frente a posibles perturbaciones. El comportamiento de las membranas fue comparable a sistemas MBR aerobios a escala industrial. Tras más de dos años de operación ininterrumpida, no se detectaron problemas significativos asociados al ensuciamiento irreversible de las membranas, incluso operando a elevadas concentraciones de sólidos en el licor mezcla (valores de hasta 25 g·L-1 ). En este trabajo se presenta un modelo de filtración (basado en el modelo de resistencias en serie) que permitió simular de forma adecuada el proceso de filtración. Por otra parte, se propone un control supervisor basado en un sistema experto que consiguió reducir el consumo energético asociado a la limpieza física de las membranas, un bajo porcentaje de tiempo destinado a la limpieza física respecto al total de operación, y, en general, un menor coste operacional del proceso de filtración. Esta tesis doctoral está integrada en un proyecto nacional de investigación, subvencionado por el Ministerio de Ciencia e Innovación (MICINN), con título ¿Modelación de la aplicación de la tecnología de membranas para la valorización energética de la materia orgánica del agua residual y la minimización de los fangos producidos¿ (MICINN, proyecto CTM2008-06809- C02-01/02). Para obtener resultados representativos que puedan ser extrapolados a plantas reales, esta tesis doctoral se ha llevado a cabo utilizando un sistema SAnMBR que incorpora módulos comerciales de membrana de fibra hueca. Además, esta planta es alimentada con el efluente del pre-tratamiento de la EDAR del Barranco del Carraixet (Valencia, España). / Robles Martínez, Á. (2013). Modelling, simulation and control of the filtration process in a submerged anaerobic membrane bioreactor treating urban wastewater [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34102 / Premios Extraordinarios de tesis doctorales