Dewatering of Chlorella pyrenoidosa using a diatomite dynamic membrane: Characteristics of a long-term operation

Chu, Huaqiang; Zhao, Yangying; Zhang, Yalei; Yang, Libin

doi:10.1016/j.memsci.2015.05.069

Cited by 18 publications

(7 citation statements)

References 41 publications

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“…With the advantage of high flux and lower risk of fouling, DM technology seems to be more suitable in this application. Chu et al [44] proved the applicability of DM technology for microalgae harvesting in long-term operation.…”

Section: Microalgae Harvestingmentioning

confidence: 99%

Dynamic Membrane Filtration: Formation, Filtration, Cleaning, and Applications

2017

Chem Eng & Technol

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Applications of dynamic membrane (DM) filtration and factors affecting formation, filtration, and cleaning are introduced. DMs have been studied extensively for wastewater treatment in recent years. DM formation methods and mechanisms are explained. Effects of supporting material, deposited material, formation pressure, and pH on the DM formation are discussed in detail. The impacts of operation pressure, aeration intensity, cross-flow velocity, temperature, and other parameters on the DM filtration process are evaluated and different DM cleaning strategies are reviewed. The applications of DMs to treatments of municipal wastewater, surface water, oily water, industrial wastewater, sludge, and microalgae harvesting are discussed. Finally, possible future research directions and some guidelines for DM technology are given.

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Section: Microalgae Harvestingmentioning

confidence: 99%

Dynamic Membrane Filtration: Formation, Filtration, Cleaning, and Applications

2017

Chem Eng & Technol

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“…When filtration was completed, the cake layer of DDM was divided into three sublayers using a medical scalpel and cut into small pieces of 1 cm × 1 cm according to previous research: the slime layer, the algae layer, and the diatomite layer [15]. The contents of protein and polysaccharides in the three sublayers were measured by means of the modified Lowry method and the enthrone-sulfuric acid method, respectively [20].…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, the main defects of this technology are membrane fouling, especially the extracellular organic matter (EOM) released by algae during the algal life cycle, which leads to high increases in filtration resistance. Chu et al investigated the dewatering of Chlorella pyrenoidosa using a DDM and found that DDM fouling can be influenced by algal growth phases as well as EOM concentration and compositions [15]. Considering that aquaculture wastewater is different from conventional natural water, a high concentration of heavy metals might exist, as heavy metal and antibiotic additives are commonly utilized during the large-scale breeding process for the treatment and prevention of diseases, promotion of animal growth, and improvement of feed utilization.…”

Section: Introductionmentioning

confidence: 99%

Diatomite Dynamic Membrane Fouling Behaviour during Dewatering of Chlorella pyrenoidosa in Aquaculture Wastewater

Huang

Chu

et al. 2021

Membranes

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Combined microalgal and membrane filtration could effectively treat aquaculture wastewater; however, the membrane fouling induced by extracellular organic matter (EOM) during the dewatering process is an issue. This study investigated diatomite dynamic membrane (DDM) fouling behaviour during the dewatering of Chlorella pyrenoidosa under the influence of copper ions. The results indicate that copper ion heavy metals in aquaculture wastewater significantly affected purification and algae dewatering by DDM. Aquaculture wastewater with a high copper concentration (1 and 0.5 mg/L) could induce serious DDM fluxes and cake layer filtration resistance (Rc), whereas fewer filtration fluxes were induced when aquaculture wastewater had a low copper concentration, particularly that of 0.1 mg/L, at which the Rc was lowest and the concentration effect was highest. Macromolecular organics of EOM, such as biopolymers, polysaccharides, and proteins, were responsible for DDM fouling and accumulated mostly in the slime layer, whereas only a small amount of them accumulated in the diatomite layer. The DDM rejected more protein-like organics of EOM in the slime layer when dewatering algae at low copper concentrations (<0.1 mg/L); however, when using the DDM to dewater algae at high copper concentrations, more polysaccharides of EOM were rejected (0.5 < Cu2+ < 5 mg/L). This result has significant ramifications for aquaculture wastewater treatment as well as algae separation and concentration by the DDM.

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“…Recent studies have reported the use of ceramic-based material for membrane in the form of a diatomite dynamic membrane (DDM) [31]. One of the studies has reported that a mixture of sand, starch, and kaoline can be used for the novel ceramic membrane production for microalgae concentration and can overcome difficulties like high shrinkage, low porosity, high thickness, poor flexibility, small pore size, etc [32].…”

Section: Figurementioning

confidence: 99%

Sustainable Cost-Effective Microalgae Harvesting Strategies for the Production of Biofuel and Oleochemicals

Rakesh

Jayakumar

Gudelli

et al. 2020

Highlights in BioScience

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Microalgae have been explored for sustainable production of biofuel and chemicals. Microalgae is promising feed stock for the production of several oleochemicals. It has the ability to utilize a variety of low cost feed stocks, accumulated large quantities of lipids and variety of value added products in their biomass. One of the major obstacles associated with the conversion of algae into value-added products is harvesting. The harvesting of algae is the most problematic area due to its low sedimentation rate, low biomass concentration, and high capital costs. Harvesting of algae is carried out by different physical, chemical, mechanical, biological, and electrolytic methods such as sedimentation, centrifugation, microstraining, dissolved air flotation, electrolytic flotation, chemical flocculation, bioflocculation, autoflocculation, Filtration. This review highlights the various methods of microalgae harvesting with advantages and future perspective of sustainable and cost-effective harvesting of microalgae.

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Dewatering of Chlorella pyrenoidosa using a diatomite dynamic membrane: Characteristics of a long-term operation

Cited by 18 publications

References 41 publications

Dynamic Membrane Filtration: Formation, Filtration, Cleaning, and Applications

Dynamic Membrane Filtration: Formation, Filtration, Cleaning, and Applications

Diatomite Dynamic Membrane Fouling Behaviour during Dewatering of Chlorella pyrenoidosa in Aquaculture Wastewater

Sustainable Cost-Effective Microalgae Harvesting Strategies for the Production of Biofuel and Oleochemicals

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