TY - JOUR
T1 - Supported gas membrane-based ammonia removal and recovery for a pH-dependent sink
T2 - Effect of water vapor transport
AU - Aligwe, Philip A.
AU - Sirkar, Kamalesh K.
AU - Canlas, Christian J.
AU - Cheng, Wu Cheng
N1 - Funding Information:
The authors gratefully acknowledge support for this research from the NSF Industry / University Cooperative Research Center for Membrane Science, Engineering and Technology that has been supported via two NSF Awards IIP1034710 and IIP-1822130 . We are grateful to 3 M Corporation for donating a number of MicroModules™ to our research. Philip Aligwe was supported by Chemical and Materials Engineering at NJIT during 2019. Anu Alli's help to Philip Aligwe during the experiments is acknowledged.
Funding Information:
The authors gratefully acknowledge support for this research from the NSF Industry/University Cooperative Research Center for Membrane Science, Engineering and Technology that has been supported via two NSF Awards IIP1034710 and IIP-1822130. We are grateful to 3 M Corporation for donating a number of MicroModules? to our research. Philip Aligwe was supported by Chemical and Materials Engineering at NJIT during 2019. Anu Alli's help to Philip Aligwe during the experiments is acknowledged.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - Sometimes NH3 is stripped from process/effluent streams through hydrophobic porous hollow-fiber-membranes (HFMs) via a supported-gas-membrane (SGM) process and recovered in concentrated H2SO4 solution as (NH4)2SO4. To recover relatively purified (NH4)2SO4, one can avoid excess H2SO4 with a more dilute H2SO4 strip solution. Neglect of strip-side mass-transfer resistance for low-pH strip H2SO4 solutions is not desirable with higher-pH H2SO4 strip solutions. Small hollow-fiber membrane modules (HFMMs) were used with a higher-pH H2SO4 strip solution. Mass transfer was successfully modeled using reaction-enhanced mass transport in higher-pH H2SO4 solution. Employing larger-scale crossflow HFMMs, time-dependent ammonia removal from a large tank having ammonia-containing process effluent was modeled for batch recirculation operation. The larger-scale modules employ shell-side feed liquid in crossflow with an overall countercurrent flow pattern and acid flow in the tube side. Modeling ammonia transport without water vapor transfer can cause substantial errors in batch recirculation method. Water vapor transport was considered here for low-pH and high-pH H2SO4 strip solutions for ammonia-containing feed in a large tank. Model results describe literature-based experimentally observed mass transfer behavior in industrial-treatment systems well. Model calculations were also made for continuous ammonia recovery from industrial effluents by a number of series-connected HFMMs without any batch recirculation.
AB - Sometimes NH3 is stripped from process/effluent streams through hydrophobic porous hollow-fiber-membranes (HFMs) via a supported-gas-membrane (SGM) process and recovered in concentrated H2SO4 solution as (NH4)2SO4. To recover relatively purified (NH4)2SO4, one can avoid excess H2SO4 with a more dilute H2SO4 strip solution. Neglect of strip-side mass-transfer resistance for low-pH strip H2SO4 solutions is not desirable with higher-pH H2SO4 strip solutions. Small hollow-fiber membrane modules (HFMMs) were used with a higher-pH H2SO4 strip solution. Mass transfer was successfully modeled using reaction-enhanced mass transport in higher-pH H2SO4 solution. Employing larger-scale crossflow HFMMs, time-dependent ammonia removal from a large tank having ammonia-containing process effluent was modeled for batch recirculation operation. The larger-scale modules employ shell-side feed liquid in crossflow with an overall countercurrent flow pattern and acid flow in the tube side. Modeling ammonia transport without water vapor transfer can cause substantial errors in batch recirculation method. Water vapor transport was considered here for low-pH and high-pH H2SO4 strip solutions for ammonia-containing feed in a large tank. Model results describe literature-based experimentally observed mass transfer behavior in industrial-treatment systems well. Model calculations were also made for continuous ammonia recovery from industrial effluents by a number of series-connected HFMMs without any batch recirculation.
KW - Ammonia removal
KW - Experiments and models
KW - Hollow fiber membranes
KW - Mass transfer coefficient
KW - Strip-side pH dependence
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U2 - 10.1016/j.memsci.2020.118308
DO - 10.1016/j.memsci.2020.118308
M3 - Article
AN - SCOPUS:85088126006
SN - 0376-7388
VL - 611
JO - Journal of Membrane Science
JF - Journal of Membrane Science
M1 - 118308
ER -