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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: Oct 27, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Phosphorus Recovery from Sewage Sludge Using Acidithiobacilli.

Surendra K Pradhan1, Helvi Heinonen-Tanski1, Anna-Maria Veijalainen1

  • 1Department of Environmental and Biological Sciences, University of Eastern Finland, FI-70211 Kuopio, Finland.

International Journal of Environmental Research and Public Health
|July 20, 2021
PubMed
Summary

Recycle phosphorus from sewage sludge using Acidithiobacillus bacteria and elemental sulfur. This method efficiently solubilizes phosphorus, offering a sustainable solution for nutrient recovery and sludge treatment.

Keywords:
Acidithiobacillus ferrooxidansAcidithiobacillus thiooxidansbioleachingphosphorus solubilizationrecoverysewage sludge

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Area of Science:

  • Environmental Microbiology
  • Biotechnology
  • Waste Management

Background:

  • Sewage sludge contains valuable phosphorus (P), a critical non-renewable plant nutrient.
  • Recycling P from sludge can help meet global demand and reduce reliance on finite resources.

Purpose of the Study:

  • To investigate phosphorus solubilization from sewage sludge using Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans.
  • To evaluate the effectiveness of elemental sulfur supplementation in enhancing P recovery.

Main Methods:

  • Sludge treatment with Acidithiobacillus bacteria in a semi-continuous culture system.
  • Supplementation with elemental sulfur in the third phase of the experiment.
  • Monitoring pH and P solubilization over 42 days.

Main Results:

  • Acidithiobacillus treatment maintained a pH between 2.2 and 6.3.
  • Supplementation with elemental sulfur reduced pH to 0.9 in A. thiooxidans treated sludge.
  • Achieved 92% phosphorus solubilization and extraction.

Conclusions:

  • Acidithiobacilli bacteria, especially when supplemented with elemental sulfur, are effective for sludge treatment.
  • This method facilitates phosphorus recovery, sludge hygienization, and heavy metal removal.