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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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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
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Organics removal in oily bilgewater by electrocoagulation process.

Mélanie Asselin1, Patrick Drogui, Satinder Kaur Brar

  • 1Institut National de la Recherche Scientifique (INRS-Eau Terre et Environnement), Université du Québec, 490 rue de la Couronne, Québec, Que., Canada G1K 9A9.

Journal of Hazardous Materials
|July 10, 2007
PubMed
Summary

Electrocoagulation effectively treats oily bilgewater using mild steel electrodes, achieving high removal rates for pollutants like BOD, O&G, and hydrocarbons. This cost-effective method offers efficient oily wastewater treatment.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Electrochemistry

Background:

  • Oily bilgewater (OBW) poses significant environmental challenges.
  • Effective and cost-efficient treatment methods for OBW are crucial for maritime operations.
  • Existing treatment methods may have limitations in efficiency and cost.

Purpose of the Study:

  • To investigate the efficacy of electrocoagulation for oily bilgewater treatment.
  • To evaluate different electrode configurations (bipolar vs. monopolar) and materials (iron, aluminum).
  • To determine the optimal operating conditions for electrocoagulation of OBW.

Main Methods:

  • Laboratory-scale electrocoagulation experiments using a 1.7 L electrolytic cell.
  • Testing of iron and aluminum electrodes in monopolar (MP) and bipolar (BP) configurations.
  • Optimization of current intensity and treatment duration.

Main Results:

  • Mild steel MP electrode system at 1.5A for 60-90 min yielded optimal performance.
  • Achieved high removal efficiencies: BOD (93.0%), Oil & Grease (95.6%), COD (up to 78.1%), hydrocarbons (99.4%), TSS (99.8%), and turbidity (98.4%).
  • Optimal electrocoagulation cost estimated at $0.46 per cubic meter of treated OBW.

Conclusions:

  • Electrocoagulation is a highly effective technology for treating oily bilgewater.
  • Mild steel MP configuration offers superior performance for OBW treatment.
  • The process is cost-effective, considering energy, electrodes, and sludge disposal costs.