Improving membrane photobioreactor performance by reducing light path: operating conditions and key performance indicators
| Autor: | L. Borrás, M. Pachés, Aurora Seco, J. González-Camejo, María Victoria Ruano, S. Aparicio, A. Jiménez-Benítez, Ramón Barat |
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| Rok vydání: | 2020 |
| Předmět: |
INGENIERIA HIDRAULICA
Environmental Engineering Hydraulic retention time Performance indicator 0208 environmental biotechnology Biomass Photobioreactor 02 engineering and technology Microorganismes Wastewater 010501 environmental sciences Membrane photobioreactor 01 natural sciences Photobioreactors chemistry.chemical_compound Nitrate Microalgae Waste Management and Disposal TECNOLOGIA DEL MEDIO AMBIENTE 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering biology Outdoor 06.- Garantizar la disponibilidad y la gestión sostenible del agua y el saneamiento para todos Ecological Modeling Chemical oxygen demand Phosphorus Pulp and paper industry biology.organism_classification Pollution 020801 environmental engineering chemistry Nitrifying bacteria Volatile suspended solids Environmental science Aigües residuals Depuració Tractament biològic Light path |
| Zdroj: | González-Camejo, J. Aparicio, S. Jiménez Benítez, Antonio Luis Pachés, María Ruano, M. Victoria Borrás Falomir, Luis Barat, Ramón Seco Torrecillas, Aurora 2020 Improving membrane photobioreactor performance by reducing light path: operating conditions and key performance indicators Water Research 172 115518 RODERIC. Repositorio Institucional de la Universitat de Valéncia instname RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| DOI: | 10.1016/j.watres.2020.115518 |
| Popis: | [EN] Microalgae cultivation has been receiving increasing interest in wastewater remediation due to their ability to assimilate nutrients present in wastewater streams. In this respect, cultivating microalgae in membrane photobioreactors (MPBRs) allows decoupling the solid retention time (SRT) from the hydraulic retention time (HRT), which enables to increase the nutrient load to the photobioreactors (PBRs) while avoiding the wash out of the microalgae biomass. The reduction of the PBR light path from 25 to 10 cm increased the nitrogen and phosphorus recovery rates, microalgae biomass productivity and photosynthetic efficiency by 150, 103, 194 and 67%, respectively.The areal biomass productivity (aBP) also increased when the light path was reduced, reflecting the better use of light in the 10-cm MPBR plant. The capital and operating operational expenditures (CAPEX and OPEX) of the 10-cm MPBR plant were also reduced by 27 and 49%, respectively. Discharge limits were met when the 10-cm MPBR plant was operated at SRTs of 3-4.5 d and HRTs of 1.25-1.5 d. At these SRT/HRT ranges, the process could be operated without a high fouling propensity with gross permeate flux (J(20)) of 15 LMH and specific gas demand (SGD(p)) between 16 and 20 Nm(air)(3)center dot M-permeate(-3). which highlights the potential of membrane filtration in MPBRs. When the continuous operation of the MPBR plant was evaluated, an optical density of 680 nm (0D680) and soluble chemical oxygen demand (sCOD) were found to be good indicators of microalgae cell and algal organic matter (AOM) concentrations, while dissolved oxygen appeared to be directly related to MPBR performance. Nitrite and nitrate (NOx) concentration and the soluble chemical oxygen demand:volatile suspended solids ratio (sCOD:VSS) were used as indicators of nitrifying bacteria activity and the stress on the culture, respectively. These parameters were inversely related to nitrogen recovery rates and biomass productivity and could thus help to prevent possible culture deterioration. 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 pre-doctoral FPU fellowship to authors J. Gonzalez-Camejo (FPU14/05082) and S. Aparicio (FPU/15/02595). |
| Databáze: | OpenAIRE |
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