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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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Experimental Research on Quarry Wastewater Purification Using Flocculation Process.

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  • 1School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.

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Summary
This summary is machine-generated.

This study optimized quarry wastewater treatment using combined organic and inorganic flocculants, significantly reducing turbidity to meet discharge standards for water reuse. The findings enhance mineral processing and environmental engineering practices.

Keywords:
DLVOflocculantquarrywastewater treatment

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Area of Science:

  • Environmental Engineering
  • Mineral Processing
  • Colloid and Surface Chemistry

Background:

  • Quarry wastewater purification faces challenges with high turbidity and poor floc settling.
  • Effective treatment is crucial for environmental compliance and water resource management.

Purpose of the Study:

  • To investigate synergistic effects of organic and inorganic flocculants for quarry wastewater treatment.
  • To optimize flocculant dosage and pH for turbidity reduction and improved floc settling.
  • To elucidate the mechanisms behind enhanced aggregation behavior.

Main Methods:

  • Optimized experiments using polyaluminium chloride (PAC), polyacrylamide (PAM), and calcium oxide (CaO).
  • Evaluation of treatment efficiency based on residual turbidity.
  • Characterization of interfacial interactions using zeta potential, optical microscopy, and DLVO theory.

Main Results:

  • Optimal conditions (200 g/m³ CaO, 2.5 g/m³ PAC, 12 g/m³ PAM) reduced residual turbidity to 97.30 NTU.
  • Achieved turbidity levels meet stringent industrial discharge standards.
  • Demonstrated potential for zero-discharge water reuse.

Conclusions:

  • Synergistic application of PAC and PAM effectively reduces quarry wastewater turbidity.
  • Optimized pH control with CaO enhances flocculation performance.
  • Interfacial studies confirm the mechanisms of enhanced aggregation and colloidal stability.