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Rapid Detection of Low-Concentration BOD in Oxygen-Rich Water Environment Achieved by Research Team


Schematic diagram of the response of facultative electrophysiological heterotrophic bacteria to BOD. credit: water research (2023). DOI: 10.1016/j.waters.2023.119897

Researchers at Nankai University’s School of Environmental Science and Engineering presented a novel strategy to achieve rapid measurement of biochemical oxygen demand (BOD) using competitive switching of the electrotrophic and heterotrophic pathways of facultative bacteria. The results are published in water research Entitled “Switching electrophysiological and trophic respiration enables biomonitoring of a low concentration of BOD in an oxygen-rich environment.”

The research team isolated and obtained a strain of Acinetobacter venetianus RAG-1 with both electrotrophic respiration and feeding from electroactive microbial biofilms (EABs) over a period of five years. The results of the research reveal that these bacteria can respire with a polarized graphite electrode in the absence of a degradable organic carbon source, and the current generated at this point can be used as a baseline for the sensors.

When soluble contaminants are present in water, RAG-1 rapidly switches to heterocyclic respiration, leading to a decrease in current. The decrease in the current value is proportional to the concentration of the organic pollutant. Based on this, the research team developed a new BOD-cathode biosensor, which has a linear response to common pollutants such as organic acids, sugars, proteins, and humic acids, as well as mixtures such as low-concentration domestic sewage and lake sediments. . It achieves sensitive monitoring of oxygen-rich water and low-BOD water, with a test time of less than three hours.

This study further explains the transformation mechanism of the metabolic pathways of facultative electrophilic bacteria and their ability to adapt and resilience in a contaminated environment. Based on this new principle, the research team will develop more heterotrophic electrotrophic microorganisms as sensors to support rapid BOD monitoring under complex environmental scenarios. This technology is expected to be used in water quality regulation for aquaculture, water quality control for treated water, and more.

more information:
Yilian Han et al, Electrophoretic switching and heterotrophic respiration enable biomonitoring of low concentration of BOD in the oxygen-rich environment, water research (2023). DOI: 10.1016/j.waters.2023.119897

Provided by Nankai University

the quote: Research Team Makes Rapid Detection of Low-Concentration BOD in an Oxygen-Rich Aquatic Environment (2023, April 26) Retrieved April 26, 2023 from https://phys.org/news/2023-04-team-rapid-low-concentration -pod-oxygen-rich.html

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