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Modeling Verbal Behavior Deficits with the Stimulus Control Ratio Equation, SCoRE
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Polynomialized model for critical DO deficit.

Devendra S Bhargava1, Babita Tyagi, S Gakkhar

  • 1Indian Institute of Technology, Roorkee, Bhargava Lane, Devpura, Haridwar 249 401, Uttarakhand, India.

Journal of Environmental Science & Engineering
|June 26, 2009
PubMed
Summary
This summary is machine-generated.

Existing dissolved oxygen sag models are outdated. A new polynomial model simplifies calculations for critical dissolved oxygen deficit in polluted streams, accounting for sedimentation and offering direct deficit evaluation.

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Area of Science:

  • Environmental Engineering
  • Water Quality Management
  • Wastewater Treatment

Background:

  • Traditional Streater-Phelps dissolved oxygen (DO) sag models are inadequate for modern polluted streams where sedimentation impacts biochemical oxygen demand (BOD) removal.
  • Bhargava's model offers a theoretical approach but involves complex, time-dependent expressions for settleable and non-settleable BOD decay.

Purpose of the Study:

  • To develop a simplified, universally applicable model for critical dissolved oxygen deficit.
  • To address the limitations of existing models by incorporating sedimentation effects and simplifying calculations.

Main Methods:

  • Developed a polynomialized form of Bhargava's model for critical DO deficit.
  • Created a single, unified expression applicable regardless of the transition time.

Main Results:

  • The polynomial model provides a single expression for critical DO deficit, eliminating the need for separate calculations based on transition time.
  • This new model directly evaluates critical dissolved oxygen deficit concentrations without prior determination of the time of occurrence.

Conclusions:

  • The presented polynomial model enhances existing literature on DO sag analysis.
  • It offers a more practical and efficient method for assessing water quality in polluted streams by directly calculating critical DO deficit.