Membrane Contactors for Maximizing Biomethane Recovery in Anaerobic Wastewater Treatments: Recent Efforts and Future Prospect

Increasing demand for water and energy has emphasized the significance of energy-efficient anaerobic wastewater treatment; however, anaerobic effluents still containing a large portion of the total CH4 production are discharged to the environment without being utilized as a valuable energy source. R...

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Bibliographic Details
Published in:Applied sciences 2021-02, Vol.11 (4), p.1372
Main Authors: Lee, Yechan, Yun, Kang Hee, Sethunga, Dilhara, Bae, Tae-Hyun
Format: Article
Language:English
Subjects:
anaerobic effluents
Anaerobic treatment
Biogas
biomethane recovery
Contactors
Efficiency
Effluents
Energy
Energy conversion
Energy conversion efficiency
Energy efficiency
Energy sources
Flooding
Flow rates
Flow velocity
Gas absorption
High flow
Liquid membranes
membrane contactor
membrane modification
Membranes
Methane
Waste to energy
Wastewater treatment
Water demand
Wetting
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Summary:Increasing demand for water and energy has emphasized the significance of energy-efficient anaerobic wastewater treatment; however, anaerobic effluents still containing a large portion of the total CH4 production are discharged to the environment without being utilized as a valuable energy source. Recently, gas–liquid membrane contactors have been considered as a promising technology to recover such dissolved methane from the effluent due to their attractive characteristics such as high specific mass transfer area, no flooding at high flow rates, and low energy requirement. Nevertheless, the development and further application of membrane contactors were still not fulfilled due to their inherent issues such as membrane wetting and fouling, which lower the CH4 recovery efficiency and thus net energy production. In this perspective, the topics in membrane contactors for dissolved CH4 recovery are discussed in the following order: (1) operational principle, (2) potential as waste-to-energy conversion system, and (3) technical challenges and recent efforts to address them. Then, future efforts that should be devoted to advancing gas–liquid membrane contactors are suggested as concluding remarks.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11041372