At present, scientists can only detect the presence of toxic bacteria in the effluent by collecting water samples and analyzing them in the laboratory for several days. During this period, it is not possible to confirm whether these water sources are safe. A group of students from the Technical University of Denmark recently created a sensor that detects bacteria in water in real time. The sensor is further enhanced by the SBT Aqua using impedance flow cytometry technology. The technology continuously flows liquid samples through a microfluidic channel. The microfluidic channel consists of a series of electrodes with a multi-voltage electrical signal added to these electrodes. The change in impedance caused by the flow of bacteria and other particles through these electrodes can then be detected by the sensor.
Because the changes in the bacteria caused by the impedance change are different from those caused by other particles, the researchers say they can distinguish between the two and get accurate, real-time readings of the relative concentrations in the sample. SBT claims the technology can detect all types of bacteria present in water at the same time.
At the same time the sensor a wide range of applications. Once harmful bacteria in the water are detected, the sensor can immediately give an alarm and use the network to track the flow of contaminated water.
Sensors are expected to go on sale next year.
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