Magnesium Hydroxide For Dephosphorization

Non-corrosive Magnesium Hydroxide (Mg(OH)₂) is increasingly being explored as an effective agent for dephosphorization—the removal of phosphorus from wastewater, industrial effluents, and even agricultural runoff. Here’s how it works and its advantages:

Mechanism of Dephosphorization with Mg(OH)₂

1.Precipitation:

• Non-corrosive Magnesium Hydroxide reacts with phosphate ions (PO₄³⁻) in water to form insoluble magnesium phosphate (Mg₃(PO₄)₂) or struvite (MgNH₄PO₄·6H₂O) in the presence of ammonium.

• The reaction can be represented as:

3Mg(OH)₂+2PO₄³⁻→Mg₃(PO₄)₂↓+6OH−

• In wastewater containing ammonia:

Mg(OH)₂+NH₄⁺+PO₄³⁻+6H₂O→MgNH₄PO₄⋅6H₂O↓+OH−

2.Adsorption & Coagulation:

• Non-corrosive Magnesium Hydroxide forms fine flocs that adsorb phosphate ions, enhancing removal efficiency.

• The high pH (alkalinity) from Mg(OH)₂ dissolution also promotes phosphate precipitation with other metals (e.g., calcium, iron).

Advantages of Using Magnesium Hydroxide

• High Efficiency: Works well in both low and high phosphate concentrations.

• PH Buffering: Unlike lime (Ca(OH)₂), Mg(OH)₂ does not drastically raise pH, reducing the need for post-treatment neutralization.

• Struvite Recovery: If ammonia is present, struvite can be harvested as a slow-release fertilizer.

• Less Sludge: Produces denser sludge compared to aluminum or iron salts, reducing disposal costs.

• Non-Toxic & Eco-Friendly: Reagent for neutralization of phosphates Safer than heavy metal-based coagulants.

  
  

Application

1.Wastewater Treatment:

Municipal and industrial wastewater (e.g., food processing, livestock farming).

Effective for eutrophication control in lakes/rivers.

2.Agricultural Runoff:

Non-corrosive Magnesium Hydroxide Reduces phosphate discharge from farms.

3.Struvite Crystallization:

Non-corrosive Magnesium Hydroxide Used in nutrient recovery systems (e.g., anaerobic digestion effluent).

Reagent for neutralization of phosphates is a sustainable, efficient, and economical option for phosphate removal, especially where struvite recovery or mild pH conditions are desired. Reagent for neutralization of phosphates’s particularly useful in nutrient recovery systems and eco-sensitive wastewater treatments.

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