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Related Concept Videos

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Optimizing Bleaching Operating Conditions Based on Mathematical Programming to Reduce AOX Emissions.

Yongjun Yin1,2, Shaoxu Chen1,2, Zhichao Ma3

  • 1College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.

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|February 21, 2022
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Summary
This summary is machine-generated.

This study optimized eucalyptus elemental chlorine-free (ECF) bleaching to reduce adsorbable organic halogen (AOX) emissions. By modeling and adjusting operating conditions, AOX was reduced by 12.5%, demonstrating an effective strategy for cleaner pulp production.

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Area of Science:

  • Environmental Chemistry
  • Chemical Engineering
  • Pulp and Paper Industry

Background:

  • Elemental Chlorine-Free (ECF) bleaching is a key process in pulp production.
  • Adsorbable Organic Halogen (AOX) compounds in wastewater are significant environmental pollutants.
  • Optimizing ECF bleaching is crucial for reducing AOX emissions and improving sustainability.

Purpose of the Study:

  • To optimize an ECF bleach plant for eucalyptus pulp to minimize adsorbable organic halogen (AOX) emissions.
  • To establish calculation models for pulp quality and AOX content based on operating conditions.
  • To develop and validate an optimization model for AOX reduction.

Main Methods:

  • Analysis of correlations between operating conditions (e.g., chlorine dioxide dosage) and pulp quality/AOX.
  • Development of calculation models for pulp quality indices and wastewater AOX content.
  • Structuring an optimization model focused on minimizing AOX emission, validated by experimental data.

Main Results:

  • Calculation models demonstrated good simulation accuracy (within 6.3% error).
  • Reduced chlorine dioxide in the D0 stage was identified as the most impactful factor for AOX reduction.
  • Optimization successfully reduced AOX emissions from 90.84 kg/h to 79.58 kg/h (a 12.5% decrease).

Conclusions:

  • The developed optimization model effectively reduces AOX emissions in eucalyptus ECF bleaching.
  • Adjusting operating conditions, particularly chlorine dioxide in the D0 stage, significantly impacts AOX levels.
  • The study provides a validated, data-driven approach for environmentally sustainable pulp bleaching.