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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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A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
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Enhanced sludge dewaterability using a bifunctional hybrid coagulant.

Shaohang Shen1, Wei Xia1, Zhang Luo2

  • 1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing. 210023, PR China.

Chemosphere
|September 30, 2023
PubMed
Summary

A new hybrid coagulant, cationic starch-silane-attapulgite (CS-Si@ATP), improves sludge dewatering by combining charge neutralization and skeleton building. This one-step method enhances dewaterability and reduces costs.

Keywords:
AttapulgiteBifunctional hybrid coagulantCationic starchCoagulationSkeleton builderSludge dewatering performance and mechanisms

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Sludge dewatering is crucial for waste management.
  • Traditional methods often involve coagulation and skeleton building separately.
  • Improving dewaterability reduces disposal volume and cost.

Purpose of the Study:

  • To design and synthesize a novel bifunctional inorganic/organic hybrid coagulant (CS-Si@ATP).
  • To evaluate the sludge dewatering performance of CS-Si@ATP.
  • To compare the one-step conditioning efficiency with traditional methods.

Main Methods:

  • Chemically coupling cationic starch (CS) with attapulgite (ATP) using a silane coupling agent (APTES).
  • Investigating the dual functions of CS (charge neutralization) and ATP (skeleton building).
  • Assessing sludge filter cake moisture content after mechanical dewatering.

Main Results:

  • CS-Si@ATP significantly enhanced sludge dewatering compared to individual components or simple mixtures.
  • Achieved a filter cake moisture content of approximately 78.30% at 0.05 MPa.
  • The one-step addition reduced the required ATP dose by nearly an order of magnitude.

Conclusions:

  • The synergistic effects of CS and ATP in CS-Si@ATP lead to superior sludge dewatering.
  • CS-Si@ATP offers a simple, cost-effective, and environmentally friendly solution for sludge treatment.
  • This hybrid coagulant presents a promising alternative for efficient sludge management.