Increasing the vibration frequency to mitigate reversible and irreversible membrane fouling using an axial vibration membrane in microalgae harvesting

2017 ◽  
Vol 529 ◽  
pp. 215-223 ◽  
Author(s):  
Fangchao Zhao ◽  
Huaqiang Chu ◽  
Yalei Zhang ◽  
Shuhong Jiang ◽  
Zhenjiang Yu ◽  
...  
Keyword(s):  
Vibration Frequency ◽  
Membrane Fouling ◽  
Axial Vibration ◽  
Microalgae Harvesting

Microalgae harvesting by an axial vibration membrane: The mechanism of mitigating membrane fouling

2016 ◽  
Vol 508 ◽  
pp. 127-135 ◽  
Author(s):  
Fangchao Zhao ◽  
Huaqiang Chu ◽  
Yiming Su ◽  
Xiaobo Tan ◽  
Yalei Zhang ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Axial Vibration ◽  
Microalgae Harvesting

Analysis of Coupled Bending-Axial Vibration of a Rotor

2013 ◽  
Vol 662 ◽  
pp. 608-611 ◽  
Author(s):  
Jian Feng Ye ◽  
Chun Long Zheng ◽  
Xue Shi Yao
Keyword(s):  
Axial Force ◽  
Vibration Frequency ◽  
Torsional Vibration ◽  
Stiffness Matrix ◽  
Tensile Force ◽  
Vibration Frequencies ◽  
Axial Vibration ◽  
Bending Vibration ◽  
Centrifugal Load ◽  
Rotor Model

Aiming at a rotor model, the coupled bending-axial vibration is being analyzed.Calculation results show that the prestress relative to rotational centrifugal load may influence bending vibration frequencies of a rotor.The bending vibration frequencies will increase when the prestress increases.The axial vibration frequency has not an influence because the direction of the spinning prestress is perpendicular to axis.When a rotor is applies axial force, a compressional force will tend to increase the axial vibration frequencies while a tensile force will decrease the axial vibration frequencies.The effects of the prestress(centrifugal load )of the spinning rotor and the axial prestress can be accounted by an adjustment of the stiffness matrix for analysis.By use of the stiffness matrix,the changed axial and bending vibration frequencies can be explained.The coupled bending-axial vibration may take place when the bending vibration frequencies have increased in the state of the changed prestress.In the end, the coupled bending-axial vibration frequency can be calculated.On the basis of prestress, the coupled lateral-torsional vibration and the coupled torsional-axial vibration frequency can be analysed,similarly.

scholarly journals Tapered Beam Axial Vibration Frequency: Linear Cross-area Variation Case

2014 ◽  
Vol 9 ◽  
pp. 323-327 ◽  
Author(s):  
Farid Chalah ◽  
Salah Eddine Djellab ◽  
Lila Chalah-Rezgui ◽  
Kamel Falek ◽  
Abderrahim Bali
Keyword(s):  
Vibration Frequency ◽  
Axial Vibration ◽  
Tapered Beam ◽  
Area Variation

Orifice-based membrane fouling inhibition employing in-situ turbulence for efficient microalgae harvesting

2020 ◽  
Vol 251 ◽  
pp. 117277
Author(s):  
Hoon Cho ◽  
Azeem Mushtaq ◽  
Taewoon Hwang ◽  
Hee-Sik Kim ◽  
Jong-In Han
Keyword(s):  
Membrane Fouling ◽  
Microalgae Harvesting

scholarly journals Maximizing the Impact of Air Bubbles for Membrane Fouling Control in Microalgae Harvesting

2017 ◽  
Vol 78 (1) ◽  
Author(s):  
Arthur Eliseus ◽  
Muhammad Roil Bilad
Keyword(s):  
Membrane Fouling ◽  
Membrane Surface ◽  
Air Bubbles ◽  
Membrane Cleaning ◽  
Shear Rates ◽  
Fouling Control ◽  
Microalgae Harvesting ◽  
Switching Mode ◽  
The Impact ◽  
Better Than

Harvesting microalgae using membrane is challenging due to the nature of microalgae having very high membrane fouling potential. Numerous techniques have been proposed for membrane fouling control, including optimizing operational cycles, imposing shear-rates via air bubbles and dosing chemicals for feed conditioning and membrane cleaning. As an established  method, the eficacy of air bubbles for membrane fouling control can be improved by maximizing the impact of shear-rates in  scouring foulant from the membrane surface. In this study, we investigate the effect of tilting angles, switching periods as well as aeration rates in a lab-scale submerged iltration system by iltering microalgae solution. Results showed that higher tilting angles improve the cleaning eficiency by offering higher lux of up to 2.7 times at an angle of 20◦ as opposed to the vertical one. It was also found that operating a one-sided panel (without switching) was about 20% better than a two-sided panel, in which the latter involved switching mode to offer aeration of both panel sides. This technique is effective in controlling fouling and can lead to energy saving for full-scale modules.

Membranes and Microalgae in Wastewater Treatment

2020 ◽  
pp. 306-336
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Municipal Wastewater ◽  
Membrane Bioreactors ◽  
Biofuel Production ◽  
Co2 Removal ◽  
Microalgae Harvesting ◽  
Harvesting Process ◽  
Carbon Dioxide Co2 ◽  
Nitrogen Phosphorus

The application of microalgae-based wastewater treatment was first introduced in the 1940s to treat municipal wastewater. Microalgae have been studied for its various potentials such as for nutrients removal, carbon dioxide (CO2) removal, biofuel production from biomass, etc. This chapter focuses on the potential of microalgae membrane bioreactors for wastewater treatment, microalgae cultivation, and harvesting. Furthermore, the selection of microalgae species is covered by comparison of nitrogen, phosphorus, COD, and BOD removal from various studies. Microalgae membrane bioreactors combine the biological treatment of microalgae with the conventional membrane bioreactor. Still, membrane fouling phenomenon is a challenge in microalgae membrane technology. Thus, several other technologies of immobilized microalgae are introduced which can potentially reduce the membrane fouling occurrence and concurrently remove the need for microalgae harvesting process.

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