Detecting coliform bacteria in water is an important indicator for assessing water quality, such as in online monitoring of medical wastewater and drinking water surveillance. As for the methods commonly used to detect coliform bacteria in water, there are three main types: the membrane filter method, the multiple tube fermentation method, and the enzyme substrate method. So, what is the relationship between these three? This article will provide the answer!

In fact, the enzyme substrate method, the multiple tube fermentation method, and the membrane filter method—these three methods for detecting coliform bacteria—are not really comparable, and there is essentially no relationship between them. The membrane filter method detects the accurate value of coliform bacteria, while the enzyme substrate method and the multiple tube fermentation method provide estimated values. The principles behind these three methods are different, and the sampling and inoculation processes also vary. These methods cannot be converted or compared with one another.

Below, let us introduce a water quality monitoring device that uses the enzyme substrate method to detect coliform bacteria! It is called the “WECT-900 Online Coliform Analyzer.” This instrument operates on the principle that the signal changes in the reaction between enzymes and bacterial culture are proportional, reflecting the coliform content in the water. It features fully automatic control functions, simple operation, and reliable performance.

Product Technical Parameters:  

– Measurement Range: 1 CFU/L – 1×10^9 CFU/L;

– Repeatability: 5%;

– Resolution: 1%

– Measurement Time: Less than 12 hours

– Cleaning and Maintenance: Automatic cleaning and disinfection before and after measurement

– Measurement Interval: Continuous or arbitrarily selectable, customizable

– Output: RS232, RS485, 4-20mA

– Ambient Temperature: 0–40°C

– Power Requirements: 220V AC ±10%, 50Hz ±5%

– Power Consumption: 200W

– Dimensions: 490×1340×375mm (W × H × D)