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Related Concept Videos

Coagulation01:06

Coagulation

385
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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Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Related Experiment Video

Updated: Sep 20, 2025

Procedure to Evaluate the Efficiency of Flocculants for the Removal of Dispersed Particles from Plant Extracts
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Enhanced Dewatering of Activated Sludge by Skeleton-Assisted Flocculation Process.

Jiahua Xia1, Ting Rao1, Juan Ji1

  • 1Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China.

International Journal of Environmental Research and Public Health
|June 10, 2022
PubMed
Summary
This summary is machine-generated.

Fly ash combined with polymerized aluminum chloride (PAC) or polymer sulfate (PFS) significantly improves sewage sludge dewatering. These novel conditioning methods enhance sludge dehydration efficiency and reduce sludge cake moisture content and specific resistance (SRF).

Keywords:
conditionerflocculationfly ashsludge conditioningsludge dewatering

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Materials Science

Background:

  • Sludge dewatering is crucial for reducing sludge volume and enabling resource utilization.
  • Developing efficient and eco-friendly sludge conditioning methods is essential for effective sludge treatment.

Purpose of the Study:

  • To evaluate the sludge dewatering performance of fly ash (FA), polymerized aluminum chloride (PAC), and polymer sulfate (PFS) individually.
  • To investigate the combined effects of these conditioners on sludge dehydration properties.

Main Methods:

  • Sludge conditioning using FA, PAC, and PFS separately and in composite formulations.
  • Analysis of sludge floc characteristics, filtrate organic matter content, and sludge cake properties (moisture content, specific resistance).

Main Results:

  • Composite conditioning enhanced sludge dewatering compared to single conditioners, increasing floc size and decreasing filtrate organic matter.
  • Fly ash coupled with PFS reduced sludge cake moisture to 76.39% and SRF to 6.63 × 10^10 m/kg.
  • Fly ash coupled with PAC resulted in 76.10% moisture and 6.91 × 10^10 m/kg SRF, with minimal pH change.

Conclusions:

  • Fly ash coupled with PAC and PFS show promise as novel, effective, and environmentally friendly conditioning methods for sludge dewatering.
  • These combined treatments offer significant improvements in sludge dehydration efficiency and sludge cake quality.