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Related Experiment Video

Updated: Jun 10, 2026

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor

Published on: October 15, 2015

[Activated sludge model based COD fractionation in wastewater characterization].

Zhen Zhou¹, Zhi-Chao Wu, Zhi-Wei Wang

¹School of Energy and Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, China. zhouzhen09@yahoo.com.cn

Huan Jing Ke Xue= Huanjing Kexue

|August 12, 2010

Summary

This summary is machine-generated.

Accurate chemical oxygen demand (COD) fractionation is crucial for activated sludge models in wastewater treatment. A new protocol and Matlab program standardize COD fractionation, revealing transportation impacts on wastewater composition.

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Measuring the Shape and Size of Activated Sludge Particles Immobilized in Agar with an Open Source Software Pipeline

Published on: January 30, 2019

Area of Science:

Environmental Engineering
Wastewater Treatment Technologies
Biochemical Processes

Context:

Activated sludge models (ASM) are vital for wastewater treatment plant (WWTP) management.
Accurate wastewater fractionation is essential for the successful application of ASM.
Existing methods for COD fractionation lack standardization, impacting model reliability.

Purpose:

To develop a standardized protocol and accompanying Matlab program for chemical oxygen demand (COD) fractionation.
To determine the COD fractions in wastewater from two distinct WWTPs in Shanghai.
To analyze the influence of factors like long-distance transportation on COD fraction concentrations.

Summary:

A novel COD fractionation protocol using three batch oxygen uptake rate (OUR) tests and a Matlab program were developed for standardized wastewater analysis.
Analysis of wastewater from Quyang and Bailonggang WWTPs revealed significant differences in COD fractions.
Bailonggang WWTP wastewater exhibited lower slowly biodegradable COD (X(S)) and particulate inert COD (X(I)), but higher heterotrophic biomass (X(H)) compared to Quyang WWTP.

Impact:

The developed protocol aids in standardizing COD fractionation, improving the accuracy of ASM applications.
Findings highlight that long pipeline transportation significantly alters COD fraction concentrations, particularly increasing heterotrophic biomass.
This research provides a foundation for more precise wastewater characterization and optimized treatment plant operations.