The comparison between vibration and aeration on the membrane performance in algae harvesting

Zhao, Fangchao; Li, Zongxue; Zhou, Xiaolin; Chu, Huaqiang; Jiang, Shuhong; Yu, Zhenjiang; Zhou, Xuefei; Zhang, Yalei

doi:10.1016/j.memsci.2019.117390

Cited by 31 publications

(7 citation statements)

References 42 publications

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“…Microalgal biorefineries could be effective for reducing the demand for fossil fuel and, thus, reduce greenhouse gas emissions, which mitigates the problems associated with global warming and climate changes [1,6]. However, microalgae are small and difficult to harvest, which becomes a major bottleneck and limits widespread use [7][8][9]. There are many technologies of microalgae harvesting, mainly including centrifugation, membrane filtration, coagulation and flocculation [10][11][12][13][14][15], however, most of these methods are of low efficiency and have high costs and high energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Air Flotation and the Combination of Air Flotation and Membrane Filtration in Microalgae Harvesting

Zhao

Han

et al. 2022

Processes

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On account of its small size and poor sedimentation performance, microalgae harvesting is restricted from a wider application. Air flotation is an efficient and fast solid–liquid separation technology, which has the potential to overcome the impediments of microalgae harvesting. In this study, factors influencing microalgae harvesting by air flotation were investigated. The results illustrated that bound extracellular organic matter (bEOM) had a greater effect on microalgae harvesting by air flotation, compared with dissolved extracellular organic matter (dEOM). Microalgae harvesting by air flotation in different growth stages proceeded, and the effect of air flotation in the heterotrophic stage was better than the autotrophic stage. The molecular weight distributions demonstrated that after air flotation, the proportion of high MW substance increased, while the proportion of low MW substance decreased, regardless of whether dEOM or bEOM. Membrane filtration was carried out for the algal solutions before and after air flotation. The membrane of pre-flotation algal solution had a higher critical flux of 51 L/m2·h than that of no-pre-flotation (24 L/m2·h), and, thus, pre-flotation had an active effect on membrane filtration in microalgae harvesting. Moreover, the combination of air flotation and membrane filtration provided an efficient technology for microalgae harvesting.

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Section: Introductionmentioning

confidence: 99%

Optimization of Air Flotation and the Combination of Air Flotation and Membrane Filtration in Microalgae Harvesting

Zhao

Han

et al. 2022

Processes

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“…As a result, this process has become the main bottleneck in the microalgal industry. Nowadays, various harvesting approaches have been applied, including centrifugation, sedimentation, flotation, filtration, and flocculation [ 8 , 15 , 16 , 17 , 18 , 19 ]. Flocculation represents a relatively low-cost and efficient approach for the harvesting of algal biomass at a large scale [ 11 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Bioflocculation of Chlorella vulgaris with a Chitosan and Walnut Protein Extract

Zou

Mouradov

et al. 2021

Biology

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Bioflocculation represents an attractive technology for harvesting microalgae with the potential additive effect of flocculants on the production of added-value chemicals. Chitosan, as a cationic polyelectrolyte, is widely used as a non-toxic, biodegradable bioflocculant for many algal species. The high cost of chitosan makes its large-scale application economically challenging, which triggered research on reducing its amount using co-flocculation with other components. In our study, chitosan alone at a concentration 10 mg/L showed up to an 89% flocculation efficiency for Chlorella vulgaris. Walnut protein extract (WPE) alone showed a modest level (up to 40%) of flocculation efficiency. The presence of WPE increased chitosan’s flocculation efficiency up to 98% at a reduced concentration of chitosan (6 mg/L). Assessment of co-flocculation efficiency at a broad region of pH showed the maximum harvesting efficiency at a neutral pH. Fourier transform infrared spectroscopy, floc size analysis, and microscopy suggested that the dual flocculation with chitosan and walnut protein is a result of the chemical interaction between the components that form a web-like structure, enhancing the bridging and sweeping ability of chitosan. Co-flocculation of chitosan with walnut protein extract, a low-value leftover from walnut oil production, represents an efficient and relatively cheap system for microalgal harvesting.

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“…15 Notably, the main drawbacks of BDD anodes are their cost and technically difficult preparation, especially the difficulties to find an appropriate substrate for deposition the diamond layer (e.g., silicon substrate is very brittle and has poor conductivity; titanium is a preferable choice as a substrate, but the service life of Ti/BDD electrode is relatively short). 16,17 The 'non-active' PbO 2 anode has been demonstrated as an alternative to BDD electrode because of its low cost, easy of synthesis and relatively high eletrocatalytic activity. A general scheme for the electrochemical degradation of organic compounds on PbO 2 has been proposed.…”

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confidence: 99%

A Comprehensive Study on Nano-Diamond Doped β-PbO₂ Electrode: Preparation, Properties and Electrocatalytic Performance

Sun

Wang

Liu

et al. 2019

J. Electrochem. Soc.

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In this study, a nano-diamond modified β-PbO2 electrode with the efficiently electrochemical performance was successfully prepared by electrodeposition method (marked as Ti/SnO2-Sb/PbO2-ND). Chronoamperometric curves for PbO2 deposition reveals that the addition of nano-diamond particles could promote the growth of β-PbO2 crystallites. This can be ascribed to the enhancement in the electrochemical generation of •OH in the presence of nano-diamond. Additionally, the presence of nano-diamond could effectively improve the electromigration of Pb2+ toward the anode surface by the formation of negatively charged [Pb2+-nano-diamond] complex. The optimum doping concentration of nano-diamond for β-PbO2 preparation was 1.5 g/L. As compared with blank β-PbO2 electrode, Ti/SnO2-Sb/PbO2-1.5ND electrode has smaller grain size, more compact film and higher ratio of Oad/(Oad+OL). The electrochemical active area for Ti/SnO2-Sb/PbO2-1.5ND electrode was increased to 4.55 cm2, while it was only 2.73 cm2 for β-PbO2 electrode. Notably, the oxygen evolution overpotential of Ti/SnO2-Sb/PbO2-1.5ND electrode was approximately 2.1 V/SCE, which was higher than blank β-PbO2 electrode (1.81 V/SCE). The almost complete removal of methylene blue could be attained within 60 min at a current density of 30 mA cm−2. Generally, the Ti/SnO2-Sb/PbO2-1.5ND shows promise as an efficient and low-cost electrode for electrochemical treatment of industrial wastewater.

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The comparison between vibration and aeration on the membrane performance in algae harvesting

Cited by 31 publications

References 42 publications

Optimization of Air Flotation and the Combination of Air Flotation and Membrane Filtration in Microalgae Harvesting

Optimization of Air Flotation and the Combination of Air Flotation and Membrane Filtration in Microalgae Harvesting

Efficient Bioflocculation of Chlorella vulgaris with a Chitosan and Walnut Protein Extract

A Comprehensive Study on Nano-Diamond Doped β-PbO₂ Electrode: Preparation, Properties and Electrocatalytic Performance

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The comparison between vibration and aeration on the membrane performance in algae harvesting

Cited by 31 publications

References 42 publications

Optimization of Air Flotation and the Combination of Air Flotation and Membrane Filtration in Microalgae Harvesting

Optimization of Air Flotation and the Combination of Air Flotation and Membrane Filtration in Microalgae Harvesting

Efficient Bioflocculation of Chlorella vulgaris with a Chitosan and Walnut Protein Extract

A Comprehensive Study on Nano-Diamond Doped β-PbO2 Electrode: Preparation, Properties and Electrocatalytic Performance

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Product

Resources

About

A Comprehensive Study on Nano-Diamond Doped β-PbO₂ Electrode: Preparation, Properties and Electrocatalytic Performance