Treatment of wastewater reverse osmosis concentrate using alginate-immobilised microalgae: Integrated impact of solution conditions on algal bead performance

Mohseni, Arash; Kube, Matthew; Fan, Linhua; Roddick, Felicity

doi:10.1016/j.chemosphere.2021.130028

Cited by 29 publications

(9 citation statements)

References 53 publications

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“…vulgaris groups and the positive control confirms that the sodium alginate matrix is capable of absorbing phosphate without the introduction of bio-remedial organisms. Mohseni et al (2021) reported alginate beads of C. vulgaris were sufficiently stable and were capable of remediation of TP up to 100% over a 10-day period. The lack of significant variance between the means of the biologically active groups indicates that the introduction of glomalin did not inhibit the ability of C. vulgaris to remove P from the solution.…”

Section: Figurementioning

confidence: 94%

“…However, work by Kube et al (2020) suggests that certain environmental conditions may play an inhibitory role in nutrient accumulation. Further, it is possible the immobilization medium could be destabilized in some aquatic conditions (Mohseni et al, 2021). The vitality of C. vulgaris, indicated by accumulated biomass, is directly correlated with the rate of orthophosphate and total phosphate removal from a nutrient loaded solution (Znad et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Current water management systems of storm drains with point source outflows are inherently primed for the application of filtration methods. In addition, increasing the stability of immobilized algae filtration mediums could lead to applications in a variety of industries including wastewater treatment (Mohseni et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Phosphorous remediation using alginate/glomalin biobeads: Examining structural cohesivity, nutrient retention, and reapplication viability

Percivall

Amgain²,

Inglett³

et al. 2022

Front. Environ. Sci.

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Excess nutrient loading from agriculture and urban runoff into limnetic and marine ecosystems is associated with harmful algal blooms that result in eutrophication. Sequestration of nutrients such as phosphorus (P) and nitrogen (N) from agricultural outflows and recycling them as soil amendments would be an environmentally and economically sustainable strategy to alleviate this problem. This study explored the use of biobeads constructed with phytoplankton, Chlorella vulgaris, alginate and glomalin as a possible medium for a cyclic culture-harvest-reapply (CHR) system to address the problem of eutrophication. These “biobeads” were constructed from different concentrations of sodium alginate, C. vulgaris, and glomalin. Bead vitality was evaluated by introducing C. vulgaris to both eutrophic (phosphate ∼1.5 ppm) and hypereutrophic (phosphate ∼4.0 ppm) solutions and measuring phosphate removal. After 9 days in the eutrophic solution, biologically active groups reduced orthophosphate concentrations by an average of 1.35 ppm (80%). In the hypereutrophic solution, an average of 1.52 ppm total phosphate removal (38%) was observed over 5 weeks. The addition of glomalin in high concentrations increased the structural cohesivity of the hydrogel matrix, while low concentrations had an inverse effect. Reapplication of these biobeads to topsoil did not reduce plant growth or plant health parameters. These data suggest that glomalin, in appropriate proportions, is a suitable secondary scaffolding for a sodium alginate hydrogel immobilization medium. The alginate beads of immobilized C. vulgaris could be a promising treatment technique for phosphorus-containing urban wastewater. Further research is warranted to assess long-term impacts on nutrient dispersal and soil quality upon reapplication.

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Section: Figurementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Phosphorous remediation using alginate/glomalin biobeads: Examining structural cohesivity, nutrient retention, and reapplication viability

Percivall

Amgain²,

Inglett³

et al. 2022

Front. Environ. Sci.

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“…Then, immobilized beads with entrapped microalgal cells are obtained after a short period of stabilization. However, in order to further achieve higher resistance toward real wastewater, a detailed optimization of the obtained alginate-immobilized microalgal system is still highly necessary and should include： optimizing the addition of microalgal beads against various wastewater treatment volumes and types [ 105 ]; selecting high-stress tolerant species together with immobilized beads [ 106 ]; choosing the suitable alginate materials [ 107 ]; directional fabrication of the bead size [ 108 ]; and enhancing environmental tolerance to factors such as pH, alkalinity and salinity through structural modification [ 109 ].…”

Section: Main Technical Approaches Employed For Microalgal Immobiliza...mentioning

confidence: 99%

Immobilized microalgal system: An achievable idea for upgrading current microalgal wastewater treatment

Han¹,

Zhang²,

Ho³

2023

Environmental Science and Ecotechnology

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“…Salt exposure of cells activate complex physiological and biochemical mechanisms, such as the recovery of turgor pressure, regulation of ion uptake and release via cell membranes, and accumulation of osmotic pressure-protective solutes and stress proteins (Hejazi and Wijffels, 2004;Ishika et al, 2018;Figler et al, 2019;Shetty et al, 2019). Therefore, salt stress can increase microalgal growth and lipid content alongside the production of several bioactive compounds (von Alvensleben et al, 2016;Kim et al, 2021;Mohseni et al, 2021). Various studies have reported that salt stress generally increases lipid accumulation, with the proportion of saturated fatty acids increasing and that of polyunsaturated fatty acids decreasing.…”

Section: Introductionmentioning

confidence: 99%

Effect of salt stress on the biomass productivity and potential bioenergy feedstock of Graesiella emersonii KNUA204 isolated from Ulleungdo Island, South Korea

Yeo

Suh

et al. 2023

Front. Energy Res.

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Microalgae are versatile, profitable, and promising sources of bioenergy and high-value products, having various applications in the biotechnology industry. Herein, G. emersonii KNUA204 was isolated from Ulleungdo Island, South Korea, and exposed to stressors, i.e., MgCl2 (75 and 150 mM) and NaCl (200 and 400 mM), to investigate improvement in its biomass productivity and feasibility of the application of biomass. Treatment with mild MgCl2 (75 mM) afforded the highest specific growth rate (μ = 0.13 d−1), dry cell weight (3 g L−1), and total carbohydrate content (29.87%). Although all salt treatments decreased chlorophyll and carotenoid contents, treatment with high NaCl concentration (400 mM) afforded the highest zeaxanthin content (0.3 mg g−1). The proximate and ultimate analyses of biomass following treatment with 150 mM MgCl2 revealed 93.85% volatile matter and 22.55 MJ kg−1 calorific value, respectively, indicating that Graesiella emersonii KNUA204 can be potentially used as bioenergy feedstock. The biodiesel quality was established based on the fatty acid methyl ester profiles, and MgCl2 treatment increased the cetane number more than the control. Therefore, the treatment of G. emersonii KNUA204 with MgCl2 during cultivation could provide a microalgae-based bioenergy feedstock with high productivity.

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Treatment of wastewater reverse osmosis concentrate using alginate-immobilised microalgae: Integrated impact of solution conditions on algal bead performance

Cited by 29 publications

References 53 publications

Phosphorous remediation using alginate/glomalin biobeads: Examining structural cohesivity, nutrient retention, and reapplication viability

Phosphorous remediation using alginate/glomalin biobeads: Examining structural cohesivity, nutrient retention, and reapplication viability

Immobilized microalgal system: An achievable idea for upgrading current microalgal wastewater treatment

Effect of salt stress on the biomass productivity and potential bioenergy feedstock of Graesiella emersonii KNUA204 isolated from Ulleungdo Island, South Korea

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