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Related Concept Videos

Factors Affecting Solubility04:01

Factors Affecting Solubility

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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Recovering Phosphate from Complex Wastewater Using Macroporous Cryogel Composited Calcium Silicate Hydrate

Tarawee Taweekarn1, Worawit Wongniramaikul1, Pariyaporn Roop-O1

  • 1Integrated Science and Technology Research Center, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Kathu, Phuket 83120, Thailand.

Molecules (Basel, Switzerland)
|January 11, 2024
PubMed
Summary

Phosphorus recovery from wastewater is crucial due to dwindling nonrenewable resources. Continuous adsorption using calcium silicate hydrate (CSH) nanoparticle columns effectively recovers phosphate from various water sources.

Keywords:
calcium silicate hydratelandry wastewaterphosphate recoveryphosphate removalreverse osmosis concentratestarch cryogel

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Water Treatment

Background:

  • Nonrenewable phosphorus resources face depletion within 30-200 years, necessitating efficient recovery methods.
  • Phosphorus-rich residues, including complex wastewater, are potential sources for recovery.
  • Developing sustainable methods for phosphorus recovery is critical for resource management and environmental protection.

Purpose of the Study:

  • To investigate phosphorus recovery from complex wastewater using continuous adsorption.
  • To evaluate the efficacy of cryogel columns composited with calcium silicate hydrate nanoparticles (CSH columns) for phosphate adsorption.
  • To analyze the factors influencing adsorption capacity and performance.

Main Methods:

  • Continuous adsorption experiments were conducted using CSH columns.
  • Phosphate recovery was tested on synthetic wastewater, household laundry wastewater, and reverse osmosis concentrate.
  • Adsorption kinetics were modeled using the Yoon-Nelson and Adams-Bohart models.
  • The influence of flow rate, initial concentration, column height, and interfering ions (carbonate, nitrate, sulfate) was assessed.

Main Results:

  • Over 99% phosphate recovery was achieved from synthetic samples, 82.82% from laundry wastewater, and 97.58% from RO concentrate.
  • Adsorption capacity increased with initial concentration and column height but decreased with flow rate.
  • The Yoon-Nelson model provided a better fit for the experimental data (R² = 0.7723-0.9643) compared to the Adams-Bohart model (R² = 0.6320-0.8899).
  • Carbonate ions significantly reduced phosphate adsorption performance (3.65 times decrease), while nitrate and sulfate had no notable effect.

Conclusions:

  • CSH columns demonstrate high efficiency for continuous phosphate adsorption and recovery from diverse wastewater streams.
  • The CSH column shows significant potential for sustainable phosphorus recovery, mitigating resource depletion.
  • Understanding the impact of interfering ions like carbonate is crucial for optimizing real-world wastewater treatment applications.