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

2021 ◽  
Vol 11 (4) ◽  
pp. 1372
Author(s):  
Yechan Lee ◽  
Kang Hee Yun ◽  
Dilhara Sethunga ◽  
Tae-Hyun Bae
Keyword(s):  
Liquid Membrane ◽  
Energy Requirement ◽  
Waste To Energy ◽  
Net Energy ◽  
Specific Mass ◽  
Ch4 Production ◽  
Energy Conversion System ◽  
Increasing Demand ◽  
Membrane Contactors ◽  
Membrane Wetting

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.

Gas-liquid membrane contactors: Modeling study of non-uniform membrane wetting

2018 ◽  
Vol 555 ◽  
pp. 463-472 ◽  
Author(s):  
Ashkan Zolfaghari ◽  
Seyyed Abbas Mousavi ◽  
Ramin Bozorgmehri Bozarjomehri ◽  
Fatemeh Bakhtiari
Keyword(s):  
Liquid Membrane ◽  
Membrane Contactors ◽  
Membrane Wetting ◽  
Uniform Membrane ◽  
Modeling Study

A Review on CO2 Capture Using Membrane Gas Absorption Technology

2012 ◽  
Vol 616-618 ◽  
pp. 1541-1545 ◽  
Author(s):  
Yue Xia Lv ◽  
Chong Qing Xu ◽  
Gui Huan Yan ◽  
Dong Yan Guo ◽  
Qi Xiao
Keyword(s):  
Research And Development ◽  
Fossil Fuels ◽  
Liquid Membrane ◽  
Separation Efficiency ◽  
Gas Absorption ◽  
Flue Gases ◽  
Promising Technology ◽  
Future Potential ◽  
Membrane Contactors ◽  
Membrane Wetting

Membrane gas absorption technology is a promising technology for CO2 removal from flue gases produced by fossil fuels combustion, which has the potential of enhancing the separation efficiency and reducing the costs associated with CO2 capture. In the present paper, important aspects of CO2 removal by membrane gas absorption technology, including liquid absorbents, membrane materials, membrane-absorbent compatibility, membrane wetting and corresponding solutions have been reviewed. Furthermore, future potential in research and development of gas-liquid membrane contactors for CO2 removal has also been briefly discussed.

scholarly journals Interphase Surface Stability in Liquid-Liquid Membrane Contactors Based on Track-Etched Membranes

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 949
Author(s):  
Stepan Bazhenov ◽  
Olga Kristavchuk ◽  
Margarita Kostyanaya ◽  
Anton Belogorlov ◽  
Ruslan Ashimov ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Porous Structure ◽  
Pore Size ◽  
Aqueous Phase ◽  
Liquid Membrane ◽  
Target Component ◽  
Interphase Surface ◽  
Asymmetric Membrane ◽  
Interface Stability ◽  
Membrane Contactors

A promising solution for the implementation of extraction processes is liquid–liquid membrane contactors. The transfer of the target component from one immiscible liquid to another is carried out inside membrane pores. For the first time, highly asymmetric track-etched membranes made of polyethylene terephthalate (PET) of the same thickness but with different pore diameters (12.5–19 nm on one side and hundreds of nanometers on the other side) were studied in the liquid–liquid membrane contactor. For analysis of the liquid–liquid interface stability, two systems widely diverging in the interfacial tension value were used: water–pentanol and water–hexadecane. The interface stability was investigated depending on the following process parameters: the porous structure, the location of the asymmetric membrane in the contactor, the velocities of liquids, and the pressure drop between them. It was shown that the stability of the interface increases with decreasing pore size. Furthermore, it is preferable to supply the aqueous phase from the side of the asymmetric membrane with the larger pore size. The asymmetry of the porous structure of the membrane makes it possible to increase the range of pressure drop values between the phases by at least two times (from 5 to 10 kPa), which does not lead to mutual dispersion of the liquids. The liquid–liquid contactor based on the asymmetric track-etched membranes allows for the extraction of impurities from the organic phase into the aqueous phase by using a 1% solution of acetone in hexadecane as an example.

Fatty acid profiles of intramuscular, intermuscular, external and internal fat in Polish Holstein-Friesian × Hereford bulls and steers fed grass silage-based diets supplemented with concentrates

2017 ◽  
Vol 57 (2) ◽  
pp. 371 ◽  
Author(s):  
Zofia Wielgosz-Groth ◽  
Monika Sobczuk-Szul ◽  
Zenon Nogalski ◽  
Magdalena Mochol ◽  
Cezary Purwin ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Energy Requirement ◽  
Net Energy ◽  
Feeding Intensity ◽  
Fat Depots ◽  
Grass Silage ◽  
Fat Deposits ◽  
Holstein Friesian ◽  
The Impact

This paper determined the impact of gender and feeding intensity on the profile of fatty acids in different types of fat deposits. The studies were conducted with 20 young bulls and 20 steers, which were Polish Holstein-Friesian and Hereford crossbreds fattened intensively – grass silage ad libitum and concentrate covered 50% of the net energy requirement in fattened cattle or semi-intensively – concentrate covered 30% of the net energy. The fatty acid profile in intramuscular, intermuscular, external and internal fat was determined. The content of intramuscular fat was lower (P < 0.001) in the longissimus muscle in the bulls (1.74%) than in the steers (3.71%). In fat of steers, the proportion of monounsaturated fatty acids was higher whereas in fat of bulls, the content of polyunsaturated fatty acids was higher. Generally the impact of the location of fat depots on the profile of fatty acids was statistically significant (P < 0.001) but there was no effect of feeding intensity.

scholarly journals Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 361 ◽  
Author(s):  
Rubén Rodríguez-Alegre ◽  
Alba Ceballos-Escalera ◽  
Daniele Molognoni ◽  
Pau Bosch-Jimenez ◽  
David Galí ◽  
...  
Keyword(s):  
Co2 Emissions ◽  
Co2 Capture ◽  
Specific Energy Consumption ◽  
Electrical Energy ◽  
Bioelectrochemical Systems ◽  
Co2 Conversion ◽  
Ch4 Production ◽  
In Series ◽  
Real Wastewater ◽  
Membrane Contactors

Anaerobic digestion of sewage sludge produces large amounts of CO2 which contribute to global CO2 emissions. Capture and conversion of CO2 into valuable products is a novel way to reduce CO2 emissions and valorize it. Membrane contactors can be used for CO2 capture in liquid media, while bioelectrochemical systems (BES) can valorize dissolved CO2 converting it to CH4, through electromethanogenesis (EMG). At the same time, EMG process, which requires electricity to drive the conversion, can be utilized to store electrical energy (eventually coming from renewables surplus) as methane. The study aims integrating the two technologies at a laboratory scale, using for the first time real wastewater as CO2 capture medium. Five replicate EMG-BES cells were built and operated individually at 0.7 V. They were fed with both synthetic and real wastewater, saturated with CO2 by membrane contactors. In a subsequent experimental step, four EMG-BES cells were electrical stacked in series while one was kept as reference. CH4 production reached 4.6 L CH4 m−2 d−1, in line with available literature data, at a specific energy consumption of 16–18 kWh m−3 CH4 (65% energy efficiency). Organic matter was removed from wastewater at approximately 80% efficiency. CO2 conversion efficiency was limited (0.3–3.7%), depending on the amount of CO2 injected in wastewater. Even though achieved performances are not yet competitive with other mature methanation technologies, key knowledge was gained on the integrated operation of membrane contactors and EMG-BES cells, setting the base for upscaling and future implementation of the technology.

Sign in / Sign up

Export Citation Format

Share Document