Resumen:
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[EN] A kinetic model of autotrophic microalgal growth in sewage was developed to determine the biokinetic processes involved, including carbon-, nitrogen- and phosphorus-limited microalgal growth, dependence on light ...[+]
[EN] A kinetic model of autotrophic microalgal growth in sewage was developed to determine the biokinetic processes involved, including carbon-, nitrogen- and phosphorus-limited microalgal growth, dependence on light intensity, temperature and pH, light attenuation and gas exchange to the atmosphere. A new feature was the differentiation between two metabolic pathways of phosphorus consumption according to the availability of extracellular phosphorus. Two scenarios were differentiated: phosphorus-replete and -deplete culture conditions. In the former, the microalgae absorbed phosphorus to grow and store polyphosphate. In the latter the microalgae used the stored polyphosphate as a phosphorus source for growth. Calibration and validation were performed with experimental data from a pilot-scale membrane photobioreactor (MPBR) fed with the permeate obtained from an anaerobic membrane bioreactor (AnMBR) pilot plant fed with real urban wastewater. 12 of the model parameters were calibrated. Despite the dynamics involved in the operating and environmental conditions, the model was able to reproduce the overall process performance with a single set of model parameters values. Four periods of different environmental and operational conditions were accurately simulated. Regarding the former, light and temperature ranged 10-406 mu molmiddotm-2middots-1 and 19.7-32.1 degrees C, respectively. Concerning the later, the photobioreactors widths were 0.25 and 0.10 m, and the biomass and hydraulic retention times ranged 3-4.5 and 1.5-2.5 days, respectively. The validation of the model resulted in an overall correlation coefficient (R2) of 0.9954. The simulation results showed the potential of the model to predict the dynamics of the different components: the relative proportions of microalgae, nitrogen and phosphorus removal, polyphosphate storage and consumption, and soluble organic matter concentration,as well as the influence of environmental parameters on the microalgae's biokinetic processes. The proposed model could provide an effective tool for the industry to predict microalgae production and comply with the discharge limits in areas declared sensitive to eutrophication.
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Código del Proyecto:
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info:eu-repo/grantAgreement/MECD//FPU15%2F02595/ES/FPU15%2F02595/
info:eu-repo/grantAgreement/MINECO//CTM2014-54980-C2-1-R/ES/OBTENCION DE BIONUTRIENTES Y ENERGIA DEL AGUA RESIDUAL URBANA MEDIANTE CULTIVO DE MICROALGAS, TRATAMIENTOS ANAEROBIOS, CRISTALIZACION DE FOSFORO, ABSORCION DE NH3 Y COMPOSTAJE/
info:eu-repo/grantAgreement/MINECO//CTM2014-54980-C2-2-R/ES/DESARROLLO DE UN SISTEMA DE CONTROL Y DE SOPORTE A LA DECISION PARA LA OBTENCION DE BIONUTRIENTES Y ENERGIA EN PROCESOS DE TRATAMIENTO DE AGUAS RESIDUALES URBANAS/
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Agradecimientos:
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This research work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO, Projects CTM2014-54980-C2-1-R and CTM2014-54980-C2-2-R) jointly with the European Regional Development Fund (ERDF) , both of ...[+]
This research work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO, Projects CTM2014-54980-C2-1-R and CTM2014-54980-C2-2-R) jointly with the European Regional Development Fund (ERDF) , both of which are gratefully acknowledged. It was also supported by the Spanish Ministry of Education, Culture and Sport via a pre-doctoral FPU fellowship to author Stephanie Aparicio (FPU/15/02595) .
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