Performance of bench-scale membrane bioreactor under real work conditions using pure oxygen: viscosity and oxygen transfer analysis

Rodríguez, Francisco Amador Riera; Martı́nez-Toledo, M.V.; González‐López, Jesús; Hontoria, E.; Poyatos, J. M.

doi:10.1007/s00449-010-0411-0

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…As the hydraulic parameters (such as SRT, HRT, flux) were maintained approximately constant, the decreasing trend of MLSS concentrations after day 81 might be attributed to the decreasing viscosity due to gradual temperature increased of the mixed liquor. The influence of sludge viscosity on MLSS concentration or vice-versa is also reported by other researchers [15][16][17]. Indeed, increase in the sludge temperature enhances rapid growth of microorganisms and thus biodegradation, however, the shorter sludge age maintained during the experiment might have effected on sludge rheology and microbial community.…”

Section: Effects Of Key Parameters On Mbr Operationsupporting

confidence: 79%

Incorporating Submerged MBR in Conventional Activated Sludge Process for Municipal Wastewater Treatment: A Feasibility and Performance Assessment

Gurung¹,

Ncibi²,

Fontmorin³

et al. 2016

J Membra Sci Technol

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A pilot-scale submerged membrane bioreactor (MBR) was incorporated in a conventional activated sludge (CAS) process for more than 100 days in order to assess the feasibility and performance on the municipal wastewater treatment. After a stabilization period of 50 days, the MBR unit was operated under various temperatures (21 ± 4°C), mixed liquor suspended solids (MLSS) concentrations (14000 ± 1800 mg L -1 ), and different aeration intensities (3 to 6 m 3 h -1 ). No significant deterioration in membrane flux was observed while operating with high biomass concentration. From the results, the removal of total suspended solids (TSS), chemical oxygen demand (COD), total phosphorus (TP) were enhanced using MBR. However, due to some limiting operational conditions, the total nitrogen (TN) removal was less efficient in MBR than in CAS. The MBR unit was 100% effective in removing E. coli and enterococcus, as well as noroviruses and adenovirus, making it more efficient than CAS. Also, the removal of most of the trace organic compounds (TrOCs) including personal care products, pharmaceuticals, steroid hormones and perfluorinated compounds were enhanced after the incorporation of MBR to CAS, as well as for many heavy metals in MBR.

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Section: Effects Of Key Parameters On Mbr Operationsupporting

confidence: 79%

Incorporating Submerged MBR in Conventional Activated Sludge Process for Municipal Wastewater Treatment: A Feasibility and Performance Assessment

Gurung¹,

Ncibi²,

Fontmorin³

et al. 2016

J Membra Sci Technol

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show abstract

“…Note that the viscosity is inversely proportional to the water temperature. The apparent bulk viscosity η can be modeled by equation (5) proposed by Rodríguez et al (2010):…”

Section: Introductionmentioning

confidence: 99%

Validation of a Simple Fouling Model for a Submerged Membrane Bioreactor

et al. 2015

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Most of the published membrane bioreactor (MBR) models have been proposed for process description and gain of insight, resulting in a large number of parameters to estimate from experimental data. These models are usually too complex for process control, and there is a need for simple, dedicated, dynamic models. In this study, attention is focused on the fouling phenomenon, which hampers the efficient operation of MBRs, and a simple model is proposed and validated using a large data base collected from a pilot plant. This model includes several manipulated variables, e.g., the permeate flow rate and the air scour, as well as a measurable perturbation such as the water temperature. To ease the identification procedure, a separation of the time scales of the process in slow and fast dynamics is exploited. The results show that the model can be used to predict the trans-membrane pressure behavior in a medium-term, about 10 days ahead.

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“…[9] The use of pure oxygen instead of air significantly increases Downloaded by [Northeastern University] at 20:39 17 November 2014 the driving force of oxygen mass transfer generated in the aeration. [10] The aim of these systems is to provide higher oxygen concentrations than those from air systems, allowing faster treatment rates with higher mixed liquor suspended solids (MLSS) concentrations and smaller aeration tanks. [11] Particle concentration, particle size and viscosity are the main parameters characterising the biomass and they are known due to their effect on oxygen transfer.…”

Section: Introductionmentioning

confidence: 99%

Influence of sludge retention time and temperature on the sludge removal in a submerged membrane bioreactor: Comparative study between pure oxygen and air to supply aerobic conditions

Rodríguez

Leyva‐Díaz

Reboleiro-Rivas

et al. 2013

Journal of Environmental Science and Health, Part A

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Performance of a bench-scale wastewater treatment plant, which consisted of a membrane bioreactor, was monitored daily using pure oxygen and air to supply aerobic conditions with the aim of studying the increases of the aeration and sludge removal efficiencies and the effect of the temperature. The results showed the capacity of membrane bioreactor systems for removing organic matter. The alpha-factors of the aeration were determined for six different MLSS concentrations in order to understand the system working when pure oxygen and air were used to supply aerobic conditions in the system. Aeration efficiency was increased between 30.7 and 45.9% when pure oxygen was used in the operation conditions (a hydraulic retention time of 12 h and MLSS concentrations between 4,018 and 11,192 mg/L). Sludge removal efficiency increased incrementally, from 0.2 to 1.5% when pure oxygen was used at low sludge retention time and from 1.5% to 15.4% at medium sludge retention time when temperature conditions were lower than 20°C. Moreover, the difference between calculated and experimental sludge retention time was lesser when pure oxygen was used to provide aerobic conditions, so the influence of the temperature decreased when the pure oxygen was used. These results showed the convenience of using pure oxygen due to the improvement in the performance of the system.

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Performance of bench-scale membrane bioreactor under real work conditions using pure oxygen: viscosity and oxygen transfer analysis

Cited by 14 publications

References 15 publications

Incorporating Submerged MBR in Conventional Activated Sludge Process for Municipal Wastewater Treatment: A Feasibility and Performance Assessment

Incorporating Submerged MBR in Conventional Activated Sludge Process for Municipal Wastewater Treatment: A Feasibility and Performance Assessment

Validation of a Simple Fouling Model for a Submerged Membrane Bioreactor

Influence of sludge retention time and temperature on the sludge removal in a submerged membrane bioreactor: Comparative study between pure oxygen and air to supply aerobic conditions

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