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Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer

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Development of a open-vessel single-stage respirometer.

S Marsili-Libelli¹, V D'Ardes, C Bondi

¹Department of Systems and Computers, University of Florence, Via S. Marta 3, I-50139, Florence, Italy. marsili@dsi.unifi.it

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|June 4, 2008

Summary

A new single-stage respirometer accurately characterizes wastewater using a novel parasitic aeration model. This advanced instrument offers superior performance for laboratory and process applications, providing reliable respirograms.

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Area of Science:

Environmental Engineering
Analytical Chemistry
Biotechnology

Background:

Wastewater characterization is crucial for effective treatment plant operation.
Conventional respirometry models often rely on a two-stage assumption, limiting accuracy.
Accurate parasitic aeration modeling is essential for precise respirometer performance.

Purpose of the Study:

To develop and validate a single-stage respirometer for laboratory and process use.
To implement an accurate model of parasitic aeration, eliminating the need for a two-stage assumption.
To assess the instrument's accuracy through rigorous analysis and laboratory testing.

Main Methods:

Development of a single-stage respirometer incorporating an accurate parasitic aeration model.
Real-time software control using Lab View for measurement and wastewater characteristic estimation.
Sensitivity and error propagation analysis to evaluate instrument accuracy.
Laboratory testing with readily degradable substrate.

Main Results:

The single-stage respirometer demonstrated superior accuracy compared to conventional models.
Consistent and accurate respirograms were obtained during laboratory validation.
The novel parasitic aeration model proved effective in simplifying the respirometer design.

Conclusions:

The developed single-stage respirometer is a reliable tool for wastewater characterization and process monitoring.
The instrument's accuracy and efficiency are enhanced by the integrated parasitic aeration model and real-time software.
This technology offers a significant advancement for environmental engineering applications.