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Updated: Jun 26, 2026

Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer
Published on: October 24, 2025
[Experimental determination of bacterial decay characteristics in biological wastewater treatment system]
Xiao-Di Hao1, Jing-Yi Zhu, Xiu-Qin Cao
1R & D Centre for Sustainable Environmental Biotechnology, Beijing University of Civil Engineering and Architecture, Beijing 100044, China. haoxiaodi@bucea.edu.cn
Abstract:
The characteristics of cell decay in biological wastewater treatment systems were investigated under aerobic condition, by measuring the decay rate and by determining the death rate with LIVE/DEAD dyeing experiments. It was found that cell decay in biological wastewater treatment systems can be actually described as two parts: decay caused by cell death and decay derived from activity decrease. The experimental results revealed that 60% of cell decay in a nitrifying system was caused by activity decrease and 40% was caused by cell death. In a heterotrophic system, however, activity decrease was responsible for 80% of cell decay, and the other cell decay for 20% was caused by cell death.
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