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DESIGN AND CHARACTERIZATION OF A MINIATURE PHOTOBIOREACTOR .

A Photobioreactor is a three-phase system consisting of the liquid phase, the gas phase and the cells. In designing a PBR, adequate understanding of the interaction between the environmental parameters, hydrodynamics and biological response is required. Figure 1.4 shows these interactions and their importance for the design of a PBR (3).

Altay Yuzeir – Rhine-Waal University – Kleve, Nordrhein .

• The goal of this project is to calculate the pressure loss inside a thin tube (mm dimension) in a photobioreactor (PBR). The flow pattern inside the tube contain two different heterogeneous liquids and one gaseous phase in-between, entering the tube in determined portions one after another.

Airlift Reactor - an overview | ScienceDirect Topics

An airlift reactor is one type of bubble reactor with an internal draft-tube that promotes gas–liquid mass transfer and mixing [52, 53].Airlift reactors have been largely used for algae cultures [54–59].As shown in the left of Figure 7, an airlift reactor contains three regions: air-riser, down-comer, and disengagement zone.Bubbles are sparged into the air-riser, which may be on the inside .

An experimental investigation of the multiphase flows in a .

Algal biomass is a promising feedstock for biofuels production, with photobioreactors being one of the major cultivation systems for algal cells. Light absorption, fluid dynamics, and algal metabolism are three key factors in determining the overall performance of a photobioreactor. The behavior of the multiphase flow (i.e., liquid phase - water, gas phase - CO2 and O2

Photobioreactors - an overview | ScienceDirect Topics

A typical photobioreactor is a three-phase system comprising the liquid phase (medium), the solid phase (cells), and the gas phase. Light, which is the unique feature of photoreactors and is often addressed as the fourth phase, is the main parameter affecting reactor design as it determines microalgal growth and, thus, photosynthetic efficiency .

Design principles of photo‐bioreactors for cultivation of .

Jul 30, 2009 · A typical photo‐bioreactor is a three phase system, namely the liquid phase which is the medium, the cells as the solid phase, and a gas phase. Light which is the unique feature of photo‐reactors is a superimposed radiation field, sometimes but not uniquely called a fourth phase. . A scalable photobioreactor system for efficient .

Design principles of photo‐bioreactors for cultivation of .

Jul 30, 2009 · A typical photo‐bioreactor is a three phase system, namely the liquid phase which is the medium, the cells as the solid phase, and a gas phase. Light which is the unique feature of photo‐reactors is a superimposed radiation field, sometimes but not uniquely called a fourth phase. . A scalable photobioreactor system for efficient .

Proceedings of Eurotherm78 - Computational Thermal .

Fig. 1 (a) Micrograph of A.variabilis (b) schematic of the photobioreactor system considered. but only scattering particles, (8) the phase function of bubbles is computed from the Mie the-ory assuming the liquid phase is non-absorbing and bubbles are spherical,(9) the scattering

Comparison of four outdoor pilot-scale photobioreactors .

Dec 18, 2015 · The horizontal tubular photobioreactor consists of three loops of 80 m each (Fig. 4) connected via a manifold to a bubble column used for oxygen removal, temperature control, nutrient and antifoam addition (Silicone RE20 Snapsil, BRB international, The Netherlands). The horizontal photobioreactor was operated at a liquid velocity of 0.45 m s −1.

CFD Simulation of Algae Production in Airlift Photobioreactor

Oct 04, 2017 · The present study focuses on simulation of algae production by photosynthesis in an airlift photobioreactor (PBR) in a batch process. The simulation studies are carried out using computational fluid dynamics (CFD) software, considering mass transfer of CO 2 from gas phase to liquid phase and O 2 from liquid phase to gas phase.

Tubular photobioreactor design for algal cultures

I irradiance on photobioreactor surface ( Em−2 s−1) o I irradiance in the water pool ( Em−2 s−1) w k volumetric gas–liquid mass transfer coefficient (s−1) L a L k L gas–liquid mass transfer coefficient (m s−1) K extinction coefficient for biomass (m2 g−1) a K B .

Design of a Cylindrical Photobioreactor with Central .

space. Therefore, a photobioreactor with concentric tubes was modelled to verify the circulation of the culture medium. Computational Methods: The physics interface used was Turbulent Bubbly Flow with low gas concentration approximation and k-ε turbulence model. Fluid properties were the default for water (liquid phase) and air (gas phase).

Development and optimization of algal cultivation systems

during the culturing process. We developed a revolving algae biofilm-based photobioreactor (RABP) system for easy harvesting and maximum biomass productivity. In our RABP system, algal cells were attached to a material that is rotating between nutrient-rich liquid phase and CO 2-rich gaseous phase for alternating absorption of nutrients and CO 2

ISS Utilization: PBR - Satellite Missions - eoPortal Directory

Table 1: Cultivation parameters during the long-term cultivation phase of [email protected] X = (0.2312 x OD 680) + (0.2886 x OD 750)/2 — [g/l] →Equation 2. For determination of nutrient uptake ([NH 4 +-N] and [PO 4 3-]) the culture supernatant (SN) was collected.SN samples were prepared and medial ion concentrations were measured according to manufacturer protocols (Hach , Berlin, Germany).

(PDF) Membrane Photobioreactor as a Device to Increase CO2 .

liquid- membrane interface; and (3) transfer of the gases into the liquid bulk phase. This can be illustrated as shown in Fig. 14.1 . Unlike a con ventional membrane, the main driving force for a .

An experimental investigation on the multiphase flows and .

sorokiniana in turbulently mixing short light-path photobioreactor. Biotechnol Prog 26:687–696 Lindken R, Merzkirch W (2000) Velocity measurements of liquid and gaseous phase for a system of bubbles rising in water. Exp Fluids 209:S194–S201 Liu Z, Zheng Y, Jia L, Zhang Q (2005) Study of bubble induced flow structure using PIV.

Closed Photobioreactor System For Continued Daily In Situ .

May 02, 2013 · The term "liquid phase" includes both the liquid in the culture, and the liquid as a condensate, . corresponding to the "evaporated then condensed" liquid. Photobioreactor Apparatus #5 and Photobioreactor Apparatus #6 are two example photobioreactors which embody the invention illustrate the enrichment or enhanced ethanol .

Fiber Bragg Grating with Polyimide–Silica Hybrid Membrane .

Aug 28, 2014 · A microstructured fiber Bragg grating (MSFBG) was created to accurately and simultaneously monitor the cell growth of photosynthetic bacteria (PSB) Rhodopseudomonas palustris CQK 01 and the temperature in a photobioreactor. The proposed sensor was made from an FBG unit that was separated into three regions, an unperturbed region, and two etched regions with smooth .

First Principles Model of a Tubular Photobioreactor for .

Assuming the same velocity for each component of the gas flow rate and no slip between the liquid phase and the gas phase, the gas transport can be modeled by changes in the cross-sectional area of the nitrogen A N 2 along the tube, being able to describe these changes by the following balance: (16) where A N 2,l is the cross-sectional area of .

Photobioreactor - LinkedIn SlideShare

Dec 06, 2017 · Typically PBRs consist of four-phase systems: cell as solid phase, growth medium as liquid phase, gaseous phase, and light radiation field. When considering the design of PBRs, issues such as gaseous exchange, mixing pattern, contamination control, light supply efficiency, building material, and geometrical configuration must be considered.

Photobioreactor to cultivate and reproduce phototrophic .

The photobioreactor for the cultivation and reproduction of phototrophic organisms in liquid phase by reacting with gaseous, solid and/or liquid additives during illumination with sun- and/or artificial light for the extraction of biomass (5) and/or its metabolic products and the utilization of surplus light energy, comprises a device for controlling light transparency and heat input, and semi .

Aeration in a Photobioreactor - Oilgae

The photobioreactor is designed without moving parts and equipped with two different spargers operated in dual sparging mode. . from gas phase to liquid phase five fold relative to conventional sparging. The dual-sparger system has the potential to minimize the required aeration rates for

CFD Simulation of Algae Production in Airlift Photobioreactor

Oct 04, 2017 · The present study focuses on simulation of algae production by photosynthesis in an airlift photobioreactor (PBR) in a batch process. The simulation studies are carried out using computational fluid dynamics (CFD) software, considering mass transfer of CO 2 from gas phase to liquid phase and O 2 from liquid phase to gas phase.

Photobioreactor - CO2 SOLUTION INC.

Apr 17, 2003 · [0062] The culture unit (110) preferably comprises means, such as a pump, for removing a portion of the liquid culture from the photobioreactor (10) and means (60) for separating the removed portion of liquid culture into a liquid phase and into a solid phase which contains the organisms. As mentioned above, the separating means is preferably a .

(PDF) Tubular Photobioreactors

two-phase fl o w PBR, the whole length of the piping between inlet and outlet was the site of mass transfer between the circulating gas and liquid. Compared to similar

(PDF) Photobioreactor Design and Fluid Dynamics

Photobioreactor design is a subject of great relevance for the attainment of a sustained development in modern technology,and has also considerable interest from the basic scientific and .

Algae to capture CO2

Mar 21, 2013 · The processes need a lot of water during production, CO2 is released through bubbling in the liquid phase and harvesting is difficult, time consuming and inefficient. In addition, the operation is .

Microalgae production in liquid foam-bed photobioreactors .

In order to separate the gas phase from the liquid phase containing algae, different methods for foam break-up will be tested, which are either based on self-drainage of the foam or based on the utilisation of foam breaking devices. Next, the performance of the foam-bed photobioreactor will be investigated, described and possibly further improved.

CFD simulation of multiphase (liquid–solid–gas) flow in an .

As there are fewer hydraulic restrictions to the liquid phase in the riser, a large amount of energy is dissipated by gas–liquid interactions. In the downcomer region, the gas phase is almost nonexistent, and bubble collisions are almost nonexistent as well.

MODELING ALGAL CULTIVATION IN A BUBBLE COLUMN .

The dispersed phase bubble populations were modeled with 10 size classes ranging from 0.1 to 12 mm. 3. RESULTS AND DISCUSSION Some results from the CFD simulations are presented in Figure 3. Figure 3. Liquid phase fractions and liquid velocities in the bubble column at superficial gas velocities 0.01 m/s on left, 0.025 m/s on right.