Microporous hollow fibres for carbon dioxide absorption: mass transfer model fitting and the supplying of carbon dioxide to microalgal cultures

Ferreira, Bruno Sommer; Fernandes, Helena; Reis, Alberto; Mateus, Marı́lia

doi:10.1002/(sici)1097-4660(199801)71:1<61::aid-jctb785>3.0.co;2-r

Cited by 53 publications

(46 citation statements)

References 20 publications

(3 reference statements)

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“…Studies (73,74) have been undertaken to compare k L a values obtained under bubbling (at different gas and liquid flow rates and at distinct bubble sizes) and under diffusion through hollowfiber membranes (of different areas and distinct construction materials); k L a typically increases with increasing liquid tangential flow rate, because of thinning of the liquid boundary layer. When comparing the rate of mass transfer obtained under bubbling or by diffusion (with all other operating conditions remaining similar) (75), it was observed that k L a values were higher in the latter case: an overall volumetric coefficient for CO 2 transfer of 1.48 × 10 -2 min -1 was found for a hydrophobic membrane, 1.33 × 10 -2 min -1 for a hydrophilic membrane and 7.0 × 10 -3 min -1 for plain bubbling (see Table 4).…”

Section: Transport Processmentioning

confidence: 99%

“…No examples have been reported pertaining to surface aeration in closed systems, probably owing to the huge areas that would be involved. Conversely, membranemediated transfer has already been tested in closed systems (74)(75)(76).…”

Section: Co 2 Transfer Systemsmentioning

confidence: 99%

“…An alternative possibility relies on the potential of microporous hollow-fiber membranes, i.e., bundles of polymeric porous fibers, potted to inlet/outlet ports in their ends and contained in adequate housings (74,75) (see Figure 8B), which may also function as gas exchangers in the setup or as the whole reactor itself. Commercial fiber modules usually contain tiny hollow fibers, with typical inner diameters of ca.…”

Section: Co 2 Transfer Systemsmentioning

confidence: 99%

“…Another alternative relies on use of hollowfiber membrane apparata, as they seem to lead to lower dissolved oxygen concentrations than bubbling systems do (74). The use of several small-sized reactors instead of one larger unit may also help alleviate this problem.…”

Section: Co 2 Transfer Systemsmentioning

confidence: 99%

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Microalgal Reactors: A Review of Enclosed System Designs and Performances

2006

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One major challenge to industrial microalgal culturing is to devise and develop technical apparata, cultivation procedures and algal strains susceptible of undergoing substantial increases in efficiency of use of solar energy and carbon dioxide. Despite several research efforts developed to date, there is no such thing as "the best reactor system"- defined, in an absolute fashion, as the one able to achieve maximum productivity with minimum operation costs, irrespective of the biological and chemical system at stake. In fact, choice of the most suitable system is situation-dependent, as both the species of alga available and the final purpose intended will play a role. The need of accurate control impairs use of open-system configurations, so current investigation has focused mostly on closed systems. In this review, several types of closed bioreactors described in the technical literature as able to support production of microalgae are comprehensively presented and duly discussed, using transport phenomenon and process engineering methodological approaches. The text is subdivided into subsections on: reactor design, which includes tubular reactors, flat plate reactors and fermenter-type reactors; and processing parameters, which include gaseous transfer, medium mixing and light requirements.

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Section: Transport Processmentioning

confidence: 99%

Section: Co 2 Transfer Systemsmentioning

confidence: 99%

Section: Co 2 Transfer Systemsmentioning

confidence: 99%

Section: Co 2 Transfer Systemsmentioning

confidence: 99%

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Microalgal Reactors: A Review of Enclosed System Designs and Performances

2006

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“…One example is that comparative studies (21,22) have indicated that microporous hollow fibers instead of plain bubbling enhance CO 2 mass transfer. Both passive and active modes have been devised and tested to improve transfer of CO 2 through the interface between the gaseous mixture and the liquid medium culture.…”

Section: Co 2 Transfermentioning

confidence: 99%

Subtask 7.1 - Strategic Studies

Erickson¹

2009

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The Energy & Environmental Research Center (EERC) has recently completed 11 years of research through the Cooperative Agreement with the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) focused on fossil energy technology development and demonstration. To support a significant number of the different activities being considered within all of our research contracts with NETL, a subtask (7.1 Strategic Studies) was created to focus on small research efforts that came up throughout the year which would support an existing EERC-NETL project or would help to develop a new concept for inclusion in future efforts. Typical efforts conducted under this task were usually between $15,000 and $60,000 in scope and had time lines of less than 6 months. A limited number of larger studies were also conducted, generally at the direct request of NETL.Over the life of this task, 46 projects were conducted. These efforts ranged from quick experiments to gain fundamental knowledge to support a current effort, to literature reviews, to a few larger engineering efforts.i EXECUTIVE SUMMARYThe Energy & Environmental Research Center (EERC) has recently completed 11 years of research through the Cooperative Agreement with the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) focused on fossil energy technology development and demonstration. To support a significant number of the different activities being considered within all of our research contracts with NETL, a subtask (7.1 Strategic Studies) was created to focus on small research efforts that came up throughout the year which would support an existing EERC-NETL project or would help to develop a new concept for inclusion in future efforts. Typical efforts conducted under this task were usually between $15,000 and $60,000 in scope and had time lines of less than 6 months. A limited number of larger studies were also conducted, generally at the direct request of NETL.Over the life of this task, 46 projects were conducted. These efforts ranged from quick experiments to gain fundamental knowledge to support a current effort, to literature reviews, to a few larger engineering efforts. The following is a list of the research projects conducted:• SUMMARIES OF RESULTSOver the life of this task, a variety of different formats were used to identify and track the activities conducted. These varying formats sometimes overlapped and sometimes conflicted with each other. For reporting purposes, the various activity numbers used throughout the years will not be used, but rather, each task will be identified by its title.For each of the following activities, the period of performance and an identifier to the final report is listed in addition to a brief summary of the activities conducted. Depending upon the size and scope of the project, the final reports range from a short write-up within a quarterly report to a separate final report. Since these projects and reports occurred over a period of eleven years, it is noted that the assum...

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