Cationic starch: an effective flocculant for separating algal biomass from wastewater RO concentrate treated by microalgae

Mohseni, Arash; Fan, Linhua; Roddick, Felicity; Li, Haihua; Gao, Yuhua; Liu, Zhenfa

doi:10.1007/s10811-020-02348-1

Cited by 12 publications

(6 citation statements)

References 49 publications

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“…On the other hand, nutrients such as NO 3 − , NO 2 − , NH 4 + , SO 4 −2 and PO 4 −3 behaved as dissolved solids trapped in the aggregates (microalgae and the cationic coagulant); reason for which occurred a significant decrease of these nutrients, compared to the uncoagulated effluent (Chen et al 2020 ). Mohseni et al ( 2021 ) reported similar results; they used an organic coagulant (cationic starch) for Chlorella vulgaris and Nannochloropsis salina recovery from wastewater. The authors recovered more than 95% of the two microalgae, simultaneously removing the total phosphorus, nitrogen, and dissolved organic carbon.…”

Section: Discussionmentioning

confidence: 80%

Use of biochar and a post-coagulation effluent as an adsorbent of malachite green, beneficial bacteria carrier, and seedling substrate for plants belonging to the poaceae family

Plaza-Rojas,

Amaya-Orozco,

Rivera-Hoyos

et al. 2023

3 Biotech

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Wastewater treatment plants produce solid and semi-solid sludge, which treatment minimises secondary environmental pollution because of wastewater treatment and obtaining new bioproducts. For this reason, in this paper, the co-pyrolysis of biogenic biomasses recovered from a biological reactor with immobilised fungal and bacterial biomass and a tertiary reactor with Chlorella sp. used for dye-contaminated wastewater treatment was carried out. Biogenic biomasses mixed with pine bark allowed the production and characterisation of two types of biochar. The raw material and biochar were on the “in vitro” germination of Lolium sp. seeds, followed by adsorption studies for malachite green (MG) dye using the raw material and the biochar. Results showed that using 60 mg L−1 of a cationic coagulant at pH 6.5 allowed for the recovery of more than 90% of the microalgae after 50 min of processing. Two biochar resulted: BC300, at pH 5.08 ± 0.08 and BC500, at pH 6.78 ± 0.01. The raw material and both biochars were co-inoculated with growth-promoting bacteria; their viabilities ranged from 1.7 × 106 ± 1.0 × 101 to 7.5 × 108 ± 6.0 × 102 CFU g−1 for total heterotrophic, nitrogen-fixing and phosphate-solubilising bacteria. Re-use tests on Lolium sp. seed germination showed that with the post-coagulation effluent, the germination was 100%, while with the biochar, with and without beneficial bacteria, the germination was 98 and 99%, respectively. Finally, BC500 adsorbed the highest percentage of malachite green at pH 4.0, obtaining qecal values of 0.5249 mg g−1 (R2: 0.9875) with the pseudo-second-order model.

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Section: Discussionmentioning

confidence: 80%

Use of biochar and a post-coagulation effluent as an adsorbent of malachite green, beneficial bacteria carrier, and seedling substrate for plants belonging to the poaceae family

Plaza-Rojas,

Amaya-Orozco,

Rivera-Hoyos

et al. 2023

3 Biotech

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“…Both under- and over-dosing could result in poor solid–liquid separation. 55 Flocculation/coagulation is a complex process and it involves multiple mechanisms such as charge neutralization, sweep coagulation, bridging, and patch flocculation. 56 Excessive CS could lead to covering of suspended particles with the flocculant, resulting in re-stabilization of the suspended solids.…”

Section: Resultsmentioning

confidence: 99%

Flocculation of livestock wastewater using cationic starch prepared from potato peels

Haleem

Osabutey

Albert

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…The size scale distribution of the etherified starch prepared in this paper showed remarkable uniformity. 40 Figure 7(e) and (f) display the absorption of light, the liquid phase dispersion, and the storage stability of the starch samples. Compared with raw starch, the etherified starch still showed a stable dispersion effect and weak light absorption, and at 50 C, the corresponding maximum dispersion of etherified starch was 97.6%.…”

Section: Performance Analysis Of Sizingmentioning

confidence: 99%

Cationic etherification modification of corn starch and its sizing property

Liu

Meng

et al. 2023

Textile Research Journal

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In order to solve the difficulty of starch being insoluble under medium and low temperature, a cationic starch slurry modified with etherification was developed. Raw starch was hydrolyzed by sodium hydroxide to improve the dispersion performance, and then the hydrolyzed starch was endowed with cationic groups by N-2,3-epoxy-propyl trimethyl ammonium chloride to improve the dispersion stability. Through various characterization methods, it was found that the quaternary ammonium cationic starch obtained was dissolved in water at medium and low temperature, and the starch structure was changed under the influence of sodium hydroxide and N-2,3-epoxy-propyl trimethyl ammonium chloride. Furthermore, the mechanical properties and abrasion resistance of cotton yarn treated with cationic starch could be significantly improved. Compared with the original yarn, the breaking strength of the yarn treated with cationic starch was increased by 70.05%, the hairiness index of the yarn was reduced by 87.5%, the abrasion resistance was increased by 500.00%, and the stiffness decreased by 276.47%. In addition, the Zeta potential of modified starch was positive, and the degree of etherification substitution of starch ranged from 0.02 to 0.26. The preparation method of etherified starch obtained has the advantages of environmental protection, low cost, and a simple process, which provides a novel way to construct textile size.

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Cationic starch: an effective flocculant for separating algal biomass from wastewater RO concentrate treated by microalgae

Cited by 12 publications

References 49 publications

Use of biochar and a post-coagulation effluent as an adsorbent of malachite green, beneficial bacteria carrier, and seedling substrate for plants belonging to the poaceae family

Use of biochar and a post-coagulation effluent as an adsorbent of malachite green, beneficial bacteria carrier, and seedling substrate for plants belonging to the poaceae family

Flocculation of livestock wastewater using cationic starch prepared from potato peels

Cationic etherification modification of corn starch and its sizing property

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