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Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater.

ABSTRACT: In this study, we determined the effectiveness of removal of nutrients (nitrates and orthophosphates) from greenhouse wastewaters (GW) using non-cross-linked chitosan (CHs) and chitosan cross-linked with epichlorohydrin (CHs-ECH) in the form of hydrogel beads. GW used in the study had the following parameters: N-NO₃ 621.1 mg/L, P-PO₄ 60.8 mg/L, SO₄^2- 605.0 mg/L, Cl^- 0.9 mg/L, Ca²⁺ 545.0 mg/L, Mg²⁺ 178.0 mg/L, K⁺ 482.0 mg/L, hardness 113° dH, and pH 6.2. The scope of the study included determination of the effect of pH on wastewater composition and effectiveness of nutrient sorption, analyses of nutrient sorption kinetics, and analyses of the effect of sorbent dose on percentage removal of nutrients from GW. CHs-ECH was able to sorb 79.4% of P-PO₄ and 76.7% of N-NO₃ from GW, whereas CHs to remove 92.8% of P-PO₄ and 53.2% of N-NO₃.

SUBMITTER: Jozwiak T

PROVIDER: S-EPMC6061506 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature

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Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater.

Jóźwiak Tomasz T Mielcarek Artur A Janczukowicz Wojciech W Rodziewicz Joanna J Majkowska-Gadomska Joanna J Chojnowska Magdalena M

Environmental science and pollution research international 20180426 19

In this study, we determined the effectiveness of removal of nutrients (nitrates and orthophosphates) from greenhouse wastewaters (GW) using non-cross-linked chitosan (CHs) and chitosan cross-linked with epichlorohydrin (CHs-ECH) in the form of hydrogel beads. GW used in the study had the following parameters: N-NO3 621.1 mg/L, P-PO4 60.8 mg/L, SO42- 605.0 mg/L, Cl- 0.9 mg/L, Ca2+ 545.0 mg/L, Mg2+ 178.0 mg/L, K+</s ...[more]

PMID: 29696546

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Project description:The implementation of inorganic adsorbents for the removal of heavy metals from industrial effluents generates secondary waste. Therefore, scientists and environmentalists are looking for environmentally friendly adsorbents isolated from biobased materials for the efficient removal of heavy metals from industrial effluents. This study aimed to fabricate and characterize an environmentally friendly composite bio-sorbent as an initiative toward greener environmental remediation technology. The properties of cellulose, chitosan, magnetite, and alginate were exploited to fabricate a composite hydrogel bead. The cross linking and encapsulation of cellulose, chitosan, alginate, and magnetite in hydrogel beads were successfully conducted through a facile method without any chemicals used during the synthesis. Energy-dispersive X-ray analysis verified the presence of element signals of N, Ca, and Fe on the surface of the composite bio-sorbents. The appearance and peak's shifting at 3330-3060 cm-1 in the Fourier transform infrared spectroscopy analysis of the composite cellulose-magnetite-alginate, chitosan-magnetite-alginate, and cellulose-chitosan-magnetite-alginate suggested that there are overlaps of O-H and N-H and weak interaction of hydrogen bonding with the Fe3O4 particles. Material degradation, % mass loss, and thermal stability of the material and synthesized composite hydrogel beads were determined through thermogravimetric analysis. The onset temperature of the composite cellulose-magnetite-alginate, chitosan-magnetite-alginate, and cellulose-chitosan-magnetite-alginate hydrogel beads were observed to be lower compared to raw-material cellulose and chitosan, which could be due to the formation of weak hydrogen bonding resulting from the addition of magnetite Fe3O4. The higher mass residual of cellulose-magnetite-alginate (33.46%), chitosan-magnetite-alginate (37.09%), and cellulose-chitosan-magnetite-alginate (34.40%) compared to cellulose (10.94%) and chitosan (30.82%) after degradation at a temperature of 700 °C shows that the synthesized composite hydrogel beads possess better thermal stability, owing to the addition of magnetite and the encapsulation in the alginate hydrogel beads.

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Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater.

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Hydrogel chitosan sorbent application for nutrient removal from soilless plant cultivation wastewater.

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