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Related Concept Videos

Coagulation01:06

Coagulation

274
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
274

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Microalgae separation in MP-PVC contaminated wastewater using plant-based coagulant over different extraction methods

Larissa Quartaroli1, Patrícia Bragança Sakamoto1, Rodrigo Braga Moruzzi2

  • 1Bauru College of Engineering, Department of Civil and Environmental Engineering, São Paulo State University (UNESP), Av. Engenheiro Luiz Edmundo Carrijo Coube, 14-01, Vargem Limpa, 17033-360, Bauru, SP, Brazil.

Journal of Environmental Management
|October 5, 2024
PubMed
Summary

Moringa oleifera extracts effectively remove microalgae from water using coagulation-flocculation-sedimentation. This natural coagulant shows high efficiency even with microplastic contamination, offering a sustainable solution for water treatment.

Keywords:
Coagulation-flocculation-sedimentationMicroalgae separationMicroplastic PVCMoringa oleifera extractsPhotobioreactor effluent

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Biocoagulation

Background:

  • Microalgae harvesting is crucial for wastewater treatment and resource recovery.
  • Microplastic contamination poses an emerging challenge to water purification processes.
  • Natural coagulants offer a sustainable alternative to synthetic chemicals in water treatment.

Purpose of the Study:

  • To evaluate the efficacy of Moringa oleifera extracts for microalgae separation.
  • To assess the performance of coagulation-flocculation-sedimentation (CFS) in contaminated photobioreactor effluent (PBR).
  • To optimize CFS conditions for microalgae and microplastic removal using response surface methodology.

Main Methods:

  • Utilized aqueous extract of delipidated Moringa oleifera powder (AEDMOP) as a natural coagulant.
  • Investigated CFS performance on PBR effluent with (PBR R2) and without (PBR R1) microplastic PVC contamination.
  • Employed response surface methodology to determine optimal coagulant dosages and conditions.

Main Results:

  • AEDMOP achieved high removal efficiencies (>83%) for turbidity, color, and various optical densities (OD) for both PBR R1 and PBR R2.
  • Optimal coagulant dosages were determined as 630 mg L⁻¹ for PBR R1 and 625 mg L⁻¹ for PBR R2.
  • Microplastic presence slightly reduced optimal coagulant dosage, indicating potential synergistic effects.

Conclusions:

  • Aqueous extract of delipidated Moringa oleifera powder is a highly effective natural coagulant for microalgae separation.
  • CFS using AEDMOP demonstrates significant potential for treating microalgae-laden water, even in the presence of microplastics.
  • Further research is needed to elucidate the role of extracellular polymeric substances in the CFS process.