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Transport properties of CO2 and CH4 in hollow fiber membrane contactor for the recovery of biogas from anaerobic membrane bioreactor effluent
| Content Provider | Semantic Scholar |
|---|---|
| Author | Rongwong, Wichitpan Wongchitphimon, Sunee Goh, Kunli Wang, Rong Bae, Tae-Hyun |
| Copyright Year | 2017 |
| Abstract | Abstract A significant amount of methane (CH 4 ) produced from anaerobic digestions of wastewater is dissolved in liquid effluent and discharged. The recovery of dissolved CH 4 is therefore essential in ensuring an enhanced energy production of the anaerobic processes, and minimizing environmental impacts of the greenhouse gas. In this work, a membrane contactor is employed as a mass transfer equipment for the CH 4 recovery. A mathematical model considering simultaneous desorption of CH 4 and carbon dioxide (CO 2 ) is developed using a resistance-in-series model to calculate the overall mass transfer coefficients. The simulations were validated with experimental results obtained using an in-house fabricated hollow fiber membrane as well as a real effluent from Anaerobic Membrane Bioreactor (AnMBR) and synthetic effluent made of water saturated with biogas. Results showed that the CO 2 fluxes were higher than those of CH 4 fluxes due to its higher concentration in liquid phase. A decrease of liquid phase mass transfer resistance by an increase in liquid velocity significantly enhanced both CH 4 and CO 2 fluxes. While, an increase in gas velocity slightly affected the CH 4 flux but enhanced the CO 2 flux considerably. It was also found that the CO 2 desorption increased the CH 4 recovery rate. The desorbed CO 2 helped to increase the mass transfer driving force by reducing the partial pressure of CH 4 in the gas side, and enhancing the gas phase mass transfer coefficient to facilitate CH 4 desorption. The increase of liquid velocity increased mole fraction of CH 4 in the gas outlet but decreased the rate of CH 4 recovery. On the other hand, applying vacuum conditions to decrease gas pressure enhanced the rate of CH 4 recovery but lower the CH 4 mole fraction in the product gas. |
| Starting Page | 62 |
| Ending Page | 72 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.memsci.2017.06.090 |
| Alternate Webpage(s) | https://dr.ntu.edu.sg/bitstream/handle/10220/44700/Transport%20properties%20of%20CO2%20and%20CH4%20in%20hollow%20fiber%20membrane%20contactor%20for%20the%20recovery%20of%20biogas%20from%20anaerobic%20membrane%20bioreactor%20effluent%20%20.pdf?isAllowed=y&sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.1016/j.memsci.2017.06.090 |
| Volume Number | 541 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
