Mineral-hydrogel composites for mitigating harmful algal bloom and supplying phosphorous for photo-biorefineries

Xiao, Zhengyang; Tan, Albern X.; Xu, Vincent; Jun, Young‐Shin; Tang, Yinjie J.

doi:10.1016/j.scitotenv.2022.157533

Cited by 8 publications

(4 citation statements)

References 78 publications

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“…Humans and animals are exposed to the biotoxins of the toxin-producing algae by consuming contaminated seafood and water activities such as swimming and inhaling droplets containing the biotoxin from the air. The non-toxic algae species may cause water discolouration and harm marine species through de-oxygenation of seawater, production of allelochemicals and mucus, or physical damage by spines or barbed setae [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the influence of crosslinking and swelling properties of modified silica-chitosan films for the controlled removal of Alexandrium minutum

Iqbal

Ibrahim

Mohammad-Noor

et al. 2023

Preprint

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Harmful algal blooms (HABs) are natural phenomenon that threatens public health, tourism, fisheries and ecosystems. Silica in its natural form is unable to mitigate HABs effectively and frequently modified with chitosan. In this study, the influence of crosslinking and swelling properties of rice husk ash silica/chitosan film reinforced with (3-glycidyloxypropyl) trimethoxysilane (GPTEOS) and glycerol (Gly) in capturing HABs cell, Alexandrium minutum was thoroughly investigated. The XRD analysis indicated that crosslinking had caused part of the chitosan’s crystalline network to become amorphous. The FTIR analysis showed that the chitosan, silica, glycerol and GPTEOS were crosslinked via a condensation reaction. The crosslinking was higher in the film containing GPTEOS (CHT/SiO2/GPTEOS) due to the condensation reaction between the GPTEOS epoxy group and the amine of chitosan in addition to the condensation of silanol and hydroxyl group of chitosan. As a result, the swelling of CHT/SiO2/GPTEOS was lower compared to Gly-containing film (CHT/SiO2/Gly). The RE value was 26.57 ± 10.81% using CHT/SiO2/Gly and 50.06 ± 11.90% using CHT/SiO2/GPTEOS. Based on the swelling and the RE trends, it is concluded that the initially trapped algae could have been released back into the environment when the films swelled. This study shows that crosslinking is important trapping the algae. The SEM and digital microscopic images of the used films revealed the presence of algae cells on the surface of the films. The films could be easily separated from the algae culture without sedimentation. The films also showed good biodegradability as all the films were fully degraded within 30 days of burial.

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Section: Introductionmentioning

confidence: 99%

Investigation on the influence of crosslinking and swelling properties of modified silica-chitosan films for the controlled removal of Alexandrium minutum

Iqbal

Ibrahim

Mohammad-Noor

et al. 2023

Preprint

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“…Similarly, mineral−hydrogel composites that contain calcium phosphate and wollastonite (CaSiO 3 ) can provide sufficient phosphate for bioreactor cyanobacterial growth for biorefineries. 24 While enhancing the solubility of final phosphate-containing solid products can help bridge the gap between wastewater phosphate recovery technologies and phosphate reuse for plant growth, we should look for phosphate reuse applications beyond traditional agriculture.…”

mentioning

confidence: 99%

“…To circumvent the limitations regarding particle size, one novel method of producing calcium phosphate uses calcium alginate hydrogels, with millimeter-scale diameters, that contain embedded nanoscale mineral calcium phosphate seeds, as reported by Kim et al Such mineral–hydrogel composites can recover phosphate effectively, and sand column experiments have shown that they provide enough phosphate to support plant growth. Similarly, mineral–hydrogel composites that contain calcium phosphate and wollastonite (CaSiO 3 ) can provide sufficient phosphate for bioreactor cyanobacterial growth for biorefineries . While enhancing the solubility of final phosphate-containing solid products can help bridge the gap between wastewater phosphate recovery technologies and phosphate reuse for plant growth, we should look for phosphate reuse applications beyond traditional agriculture.…”

mentioning

confidence: 99%

Opportunities for Emerging Wastewater Phosphorus Recovery Technologies to Enable Circular Phosphorus Usage in Nontraditional Hydroponic Agriculture

Tan

Jun

2023

ACS Agric. Sci. Technol.

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“…Our recent paper 20 characterized Ca-alginate hydrogel for nutrient delivery to support cyanobacterial growth. In this study, Ca-alginate hydrogel was used to encapsulate the heterotrophic workhorses.…”

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confidence: 99%

Photobiological production of high-value pigments via compartmentalized co-cultures using Ca-alginate hydrogels

Zhao

Sengupta

Tan

et al. 2022

Sci Rep

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Engineered cyanobacterium Synechococcus elongatus can use light and CO2 to produce sucrose, making it a promising candidate for use in co-cultures with heterotrophic workhorses. However, this process is challenged by the mutual stresses generated from the multispecies microbial culture. Here we demonstrate an ecosystem where S. elongatus is freely grown in a photo-bioreactor (PBR) containing an engineered heterotrophic workhorse (either β-carotene-producing Yarrowia lipolytica or indigoidine-producing Pseudomonas putida) encapsulated in calcium-alginate hydrogel beads. The encapsulation prevents growth interference, allowing the cyanobacterial culture to produce high sucrose concentrations enabling the production of indigoidine and β-carotene in the heterotroph. Our experimental PBRs yielded an indigoidine titer of 7.5 g/L hydrogel and a β-carotene titer of 1.3 g/L hydrogel, amounts 15–22-fold higher than in a comparable co-culture without encapsulation. Moreover, 13C-metabolite analysis and protein overexpression tests indicated that the hydrogel beads provided a favorable microenvironment where the cell metabolism inside the hydrogel was comparable to that in a free culture. Finally, the heterotroph-containing hydrogels were easily harvested and dissolved by EDTA for product recovery, while the cyanobacterial culture itself could be reused for the next batch of immobilized heterotrophs. This co-cultivation and hydrogel encapsulation system is a successful demonstration of bioprocess optimization under photobioreactor conditions.

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Mineral-hydrogel composites for mitigating harmful algal bloom and supplying phosphorous for photo-biorefineries

Cited by 8 publications

References 78 publications

Investigation on the influence of crosslinking and swelling properties of modified silica-chitosan films for the controlled removal of Alexandrium minutum

Investigation on the influence of crosslinking and swelling properties of modified silica-chitosan films for the controlled removal of Alexandrium minutum

Opportunities for Emerging Wastewater Phosphorus Recovery Technologies to Enable Circular Phosphorus Usage in Nontraditional Hydroponic Agriculture

Photobiological production of high-value pigments via compartmentalized co-cultures using Ca-alginate hydrogels

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