A comprehensive review on harvesting of microalgae using Polyacrylamide-Based Flocculants: Potentials and challenges

Shaikh, Shifa M.R.; Hassan, Mohammad K.; Nasser, Mustafa S.; Sayadi, Sami; Ayesh, Ahmad I.; Vasagar, Vivek

doi:10.1016/j.seppur.2021.119508

Cited by 44 publications

(11 citation statements)

References 82 publications

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“… 60–62 However, microalgal monocultures are difficult to maintain due to several constraints such as accidental contamination by wild microalgal strains, bacteria and pathogens. 63–65 Recent research suggests that polycultures can promote both ecosystem robustness and productivity [for example, see 33 ]. For this reason, a greater understanding of species interactions along with patterns of communities’ change with time in a confined environment is needed to enhance the ecological health and the productivity of PBR polycultures.…”

Section: The Role Of the Phycospherementioning

confidence: 99%

Algae communication, conspecific and interspecific: the concepts of phycosphere and algal-bacteria consortia in a photobioreactor (PBR)

Mugnai

Derossi

Hendlin

2023

Plant Signaling & Behavior

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Microalgae in the wild often form consortia with other species promoting their own health and resource foraging opportunities. The recent application of microalgae cultivation and deployment in commercial photobioreactors (PBR) so far has focussed on single species of algae, resulting in multi-species consortia being largely unexplored. Reviewing the current status of PBR ecological habitat, this article argues in favor of further investigation into algal communication with conspecifics and interspecifics, including other strains of microalgae and bacteria. These mutualistic species form the ‘phycosphere’: the microenvironment surrounding microalgal cells, potentiating the production of certain metabolites through biochemical interaction with cohabitating microorganisms. A better understanding of the phycosphere could lead to novel PBR configurations, capable of incorporating algal-microbial consortia, potentially proving more effective than single-species algal systems.

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Section: The Role Of the Phycospherementioning

confidence: 99%

Algae communication, conspecific and interspecific: the concepts of phycosphere and algal-bacteria consortia in a photobioreactor (PBR)

Mugnai

Derossi

Hendlin

2023

Plant Signaling & Behavior

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“…PAM as a flocculant has achieved efficient solid–liquid separation for various high turbid wastewater, e.g. bauxite slag, kaolin, chromium(III) oxide, microalgae, and Porphyridium purpurem . Additionally, it also possesses high capability for sludge dewatering treatment to effectively reduce bound water and optimize the fluidity .…”

Section: Introductionmentioning

confidence: 99%

Green Photocatalytic Route To Synthesize Cross-Linked Polyacrylamide Flocculant for Flocculation of High Turbid Wastewater

Shi,

Zhou,

Liu

et al. 2024

Ind. Eng. Chem. Res.

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As one of the most important flocculants, polyacrylamide (PAM)-based materials show enhanced capability to purify highly turbid wastewater by prolonging the length of molecular chains and modifying functional groups, which, however, generally involves complex synthetic procedures and expensive functional guests. In this study, exfoliated g-C 3 N 4 colloids (CNCs) were used as sunlight-driven photocatalysts to trigger the radical polymerization of acrylamide (AM) without adding any initiator. More importantly, the CNCs also acted as a cross-linker to prolong the PAM chain, thus promoting the flocculation of turbid water. The CNCs content in the CNCs/ PAM hybrid (CNPAM), hybrid dosage, and pH value were optimized. We further studied the effects of stirring speed and time as well as sedimentation time on the flocculation behavior. Under optimal conditions, the CNPAM flocculant could effectively flocculate kaolin suspension with a transmittance of >93%. The fractal dimension analysis indicated floc size increased with the enhancement of the CNC content in the CNPAM flocculant. It was testified that the flocculant had good universality for high turbid water in different concentrations and with the presence of various inorganic salts. This study demonstrates the photocatalysis of CNCs is a green, time-saving, and economical route to prepare crossing-linked CNPAM skeleton and that CNCs are promising efficient flocculants for the purification of high turbid wastewater.

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“…The major components of interest harvested from microalgae include proteins, lipids, carbohydrates and minor concentrations of vitamins, pigments, and sterols (Shaikh et al, 2021). These valuable products can be used to produce feedstocks for food and feed supplements, nutraceuticals, pharmaceuticals, and as chemicals (Lammens et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Evidence Of The Drying Technique’s Impact On The Biomass Quality Of Tetraselmis Subcordiformis (Chlorophyceae)

Jabri

Cherif

Siddiqui

et al. 2022

Preprint

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Rapid drying, cost-effective and safe, will increase the viability of using microalgae for several bio-industrial applications. In this study, five different drying techniques of microalgal biomass were investigated. These include freeze-drying, oven drying, air drying, sun drying, and microwave drying. Morphology, metabolite content, FAME profiling, chlorophyll content, total organic carbon, and total nitrogen were analyzed. Results showed that the freeze-drying technique preserves the highest amounts of chlorophyll, proteins, and lipids. Oven drying underperformed as it retained the lowest amount of chlorophyll, protein, and lipid content. More importantly, FAME profiling results showed that air drying was the best technique in maintaining the highest amount of Polyunsaturated fatty acids and more specifically docosahexaenoic acid. Furthermore, this process requires the least capital and energy needs. The findings from this study confirmed that the drying technique affects the microalga biomass quality.

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A comprehensive review on harvesting of microalgae using Polyacrylamide-Based Flocculants: Potentials and challenges

Cited by 44 publications

References 82 publications

Algae communication, conspecific and interspecific: the concepts of phycosphere and algal-bacteria consortia in a photobioreactor (PBR)

Algae communication, conspecific and interspecific: the concepts of phycosphere and algal-bacteria consortia in a photobioreactor (PBR)

Green Photocatalytic Route To Synthesize Cross-Linked Polyacrylamide Flocculant for Flocculation of High Turbid Wastewater

Evidence Of The Drying Technique’s Impact On The Biomass Quality Of Tetraselmis Subcordiformis (Chlorophyceae)

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