Characterization of gas transfer and mixing in a bubble column equipped with a rubber membrane diffuser

Membrane sparger in bubble column, airlift, and combined membrane–ring sparger bioreactors

“…In spite of the fact that small bubbles were also obtained in the ALM58 and ALM11, t M values in these reactors corresponded very well with values observed in airlift reactors with water and ring sparger aeration (Lu et al, 1994;Merchuk et al, 1996). Poulsen and Iversen (1998) found that k L a in the BCM in both coalescent and noncoalescent liquids was as high as or higher than previous values obtained in bubble columns. As mentioned above k L a in BCMR and BCM were almost identical.…”

“…The Plexiglas reactors were 2 m high with an inner diameter of 15 cm and a maximal working volume of 32 L. They were equipped with a membrane sparger. The bubble column (BCM) was described in detail by Poulsen and Iversen (1998). Airlift configurations (ALM) were made by placing a concentric inner tube in the bubble column ( Fig.…”

“…The k L a was determined by the Pressure Step Dynamic Method (PDM; Linek et al, 1989), where the pressure in the reactor was changed abruptly by approximately 20% as described by Poulsen and Iversen (1998).…”

Membrane sparger in bubble column, airlift, and combined membrane–ring sparger bioreactors

“…In spite of the fact that small bubbles were also obtained in the ALM58 and ALM11, t M values in these reactors corresponded very well with values observed in airlift reactors with water and ring sparger aeration (Lu et al, 1994;Merchuk et al, 1996). Poulsen and Iversen (1998) found that k L a in the BCM in both coalescent and noncoalescent liquids was as high as or higher than previous values obtained in bubble columns. As mentioned above k L a in BCMR and BCM were almost identical.…”

“…The Plexiglas reactors were 2 m high with an inner diameter of 15 cm and a maximal working volume of 32 L. They were equipped with a membrane sparger. The bubble column (BCM) was described in detail by Poulsen and Iversen (1998). Airlift configurations (ALM) were made by placing a concentric inner tube in the bubble column ( Fig.…”

“…The k L a was determined by the Pressure Step Dynamic Method (PDM; Linek et al, 1989), where the pressure in the reactor was changed abruptly by approximately 20% as described by Poulsen and Iversen (1998).…”

Microalgal bioreactors: Challenges and opportunities

“…Considering the high mass transfer, low energy costs, and extremely low physical stress, some bubble column photobioreactors are equipped with a rubber membrane diffuser or dual spargers to improve the mass transfer of gases: provision of CO 2 and removal of O 2 78, 79. In the case of dual sparging, the efficiency of CO 2 transfer increased fivefold relative to that of conventional sparging 79.…”

Advances in Chemical Engineering

“…A modified version of these bubble column bioreactors is porous membrane reactors, which have efficient aeration, give smaller bubbles, and pressure drop across the membrane is low compared with other rigid sparged bubble column reactors. These characteristics are achievable at high gas flow rates, with low energy costs (Poulsen & Iversen, 1997).…”

Membrane sparger in bubble column, airlift, and combined membrane–ring sparger bioreactors

“…In spite of the fact that small bubbles were also obtained in the ALM58 and ALM11, t M values in these reactors corresponded very well with values observed in airlift reactors with water and ring sparger aeration (Lu et al, 1994;Merchuk et al, 1996). Poulsen and Iversen (1998) found that k L a in the BCM in both coalescent and noncoalescent liquids was as high as or higher than previous values obtained in bubble columns. As mentioned above k L a in BCMR and BCM were almost identical.…”

“…The Plexiglas reactors were 2 m high with an inner diameter of 15 cm and a maximal working volume of 32 L. They were equipped with a membrane sparger. The bubble column (BCM) was described in detail by Poulsen and Iversen (1998). Airlift configurations (ALM) were made by placing a concentric inner tube in the bubble column ( Fig.…”

“…The k L a was determined by the Pressure Step Dynamic Method (PDM; Linek et al, 1989), where the pressure in the reactor was changed abruptly by approximately 20% as described by Poulsen and Iversen (1998).…”

Microalgal bioreactors: Challenges and opportunities

“…Considering the high mass transfer, low energy costs, and extremely low physical stress, some bubble column photobioreactors are equipped with a rubber membrane diffuser or dual spargers to improve the mass transfer of gases: provision of CO 2 and removal of O 2 78, 79. In the case of dual sparging, the efficiency of CO 2 transfer increased fivefold relative to that of conventional sparging 79.…”

Advances in Chemical Engineering

“…A modified version of these bubble column bioreactors is porous membrane reactors, which have efficient aeration, give smaller bubbles, and pressure drop across the membrane is low compared with other rigid sparged bubble column reactors. These characteristics are achievable at high gas flow rates, with low energy costs (Poulsen & Iversen, 1997).…”

Membrane sparger in bubble column, airlift, and combined membrane–ring sparger bioreactors

“…In spite of the fact that small bubbles were also obtained in the ALM58 and ALM11, t M values in these reactors corresponded very well with values observed in airlift reactors with water and ring sparger aeration (Lu et al, 1994;Merchuk et al, 1996). Poulsen and Iversen (1998) found that k L a in the BCM in both coalescent and noncoalescent liquids was as high as or higher than previous values obtained in bubble columns. As mentioned above k L a in BCMR and BCM were almost identical.…”

“…The Plexiglas reactors were 2 m high with an inner diameter of 15 cm and a maximal working volume of 32 L. They were equipped with a membrane sparger. The bubble column (BCM) was described in detail by Poulsen and Iversen (1998). Airlift configurations (ALM) were made by placing a concentric inner tube in the bubble column ( Fig.…”

“…The k L a was determined by the Pressure Step Dynamic Method (PDM; Linek et al, 1989), where the pressure in the reactor was changed abruptly by approximately 20% as described by Poulsen and Iversen (1998).…”

Microalgal bioreactors: Challenges and opportunities

“…Considering the high mass transfer, low energy costs, and extremely low physical stress, some bubble column photobioreactors are equipped with a rubber membrane diffuser or dual spargers to improve the mass transfer of gases: provision of CO 2 and removal of O 2 78, 79. In the case of dual sparging, the efficiency of CO 2 transfer increased fivefold relative to that of conventional sparging 79.…”

Advances in Chemical Engineering

“…A modified version of these bubble column bioreactors is porous membrane reactors, which have efficient aeration, give smaller bubbles, and pressure drop across the membrane is low compared with other rigid sparged bubble column reactors. These characteristics are achievable at high gas flow rates, with low energy costs (Poulsen & Iversen, 1997).…”