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Coagulation01:06

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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...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Revisiting Coiled Flocculator Performance for Particle Aggregation.

Elvis Carissimi1, Daniela Guzzon Sanagiotto, Edith Beatriz Camaño Schettini

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Flocculator design, specifically curvature and torsion, significantly impacts flocculation efficiency. Coiled pipes enhance floc size and settling rates for iron hydroxide and coal particle suspensions.

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Area of Science:

  • Environmental Engineering
  • Fluid Dynamics
  • Colloid Science

Background:

  • Flocculation is crucial for water treatment and particle aggregation.
  • Understanding hydrodynamic effects on flocculation is essential for process optimization.
  • Previous studies have not fully explored the impact of torsion and curvature in plug flow flocculators.

Purpose of the Study:

  • To evaluate the influence of torsion and curvature parameters on flocculation efficiency.
  • To investigate how flocculator design affects floc size and settling rates.
  • To analyze the relationship between hydrodynamic conditions and particle aggregation.

Main Methods:

  • Utilized a hydraulic plug flow flocculator, the Flocs Generator Reactor (FGR).
  • Employed colloidal iron(III) hydroxide (Fe(OH)3) and coal particles as model suspensions.
  • Assessed flocculation effectiveness via floc settling rates and photographic analysis of floc size.

Main Results:

  • Curvature induces secondary flow, altering flow profiles compared to straight pipes.
  • Flocculator design significantly influenced Fe(OH)3 floc size and settling rates (13 m/h for coiled vs. 4 m/h for straight).
  • Turbulent kinetic energy increases with curvature (constant torsion), enhancing floc formation.

Conclusions:

  • Flocculator geometry, specifically curvature and torsion, is a key factor in flocculation efficiency.
  • Coiled pipe designs in the FGR demonstrate superior performance in floc size and settling.
  • Hydrodynamic conditions, influenced by design, directly impact the aggregation of colloidal particles.