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An integrated system for wastewater COD characterization and a case study.

P Lu1, X Zhang, D Zhang

  • 1Department of Environmental Science, Chongqing University, Chongqing 400044, China. lupl@cqu.edu.cn

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|August 24, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a practical guideline for characterizing wastewater Chemical Oxygen Demand (COD) fractions, essential for the Activated Sludge Model (ASM). The developed method simplifies COD analysis for improved wastewater treatment plant modeling.

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Area of Science:

  • Environmental Science
  • Environmental Engineering
  • Water Treatment Technology

Background:

  • Accurate characterization of Chemical Oxygen Demand (COD) fractions is crucial for effective wastewater treatment plant operation and modeling using the Activated Sludge Model (ASM).
  • Existing methods for COD fractionation can be complex and lack standardization, hindering systematic application in wastewater treatment.
  • The Activated Sludge Model (ASM) requires detailed influent characterization for accurate process simulation and optimization.

Purpose of the Study:

  • To develop a systematic and practical guideline for characterizing wastewater COD fractions as defined in the Activated Sludge Model (ASM1).
  • To evaluate and select appropriate physical-chemical and respirometric methods for determining soluble inert, readily biodegradable, and slowly biodegradable COD.
  • To propose an integrated system for COD characterization and demonstrate its application to real wastewater influent.

Main Methods:

  • Experimental comparison of four physical-chemical methods for wastewater characterization.
  • Selection of flocculation combined with 0.45 μm membrane filtration and respirometry for soluble inert COD determination.
  • Respirometric measurement of raw wastewater for simultaneous determination of readily and slowly biodegradable COD.
  • Evaluation of two methods for heterotrophic biomass determination.

Main Results:

  • Flocculation + 0.45 μm membrane filtration combined with respirometry was identified as a suitable method for soluble inert COD.
  • Simultaneous determination of readily and slowly biodegradable COD using respirometry on raw wastewater was demonstrated as feasible.
  • An integrated system for ASM1-defined COD fractionation was proposed and successfully applied to characterize treatment plant influent.
  • The developed guideline facilitates detailed and practical COD characterization.

Conclusions:

  • The proposed guideline provides a systematic approach to wastewater COD characterization for Activated Sludge Model applications.
  • The integrated method enables efficient and accurate determination of key COD fractions, improving wastewater treatment modeling.
  • This study offers a valuable framework for developing more widely accepted guidelines for COD analysis in wastewater engineering.