At the end of August 2021, reports indicated that the total number of bacterial colonies in the groundwater of a village seriously exceeded the standard. After verification, the pollution was found to be caused by a large amount of waste landfill, which further affected the groundwater and resulted in severe contamination.

So where do excessive coliform bacteria in groundwater mainly come from, and how should we respond?

There are many causes of excessive coliform bacteria in groundwater, such as the aforementioned waste landfill, as well as domestic sewage including toilet flushing water, and irregular wastewater discharge by enterprises. Once consumed by humans, such contaminated groundwater can cause health hazards. Therefore, relevant authorities should conduct regular inspections.

The WECT-900 Online Coliform Analyzer is used to detect coliform levels in groundwater, and the water quality is evaluated based on the measured data. How does this device obtain groundwater data? It is quite simple. Each online device produced by Hangzhou Modi must be connected to a pump, which delivers the water sample to the device for real-time monitoring.

How to prevent groundwater from being contaminated? The key is to start with source control.

For example, if medical wastewater is discharged without treatment, the large amount of coliform bacteria contained in it will seep into the soil and eventually reach the groundwater, deteriorating its quality. In such cases, we must control the pollution at the source and properly treat medical wastewater.

Disinfection and sterilization must be completed before discharge, and various indicators in the wastewater should be monitored with water quality testing instruments. Discharge is allowed only after all indicators meet the standards.

During wastewater disinfection, the dosage of disinfectants must also be strictly controlled. For chlorine-based disinfectants, for instance, the RCl900 Online Total Residual Chlorine Analyzer should be installed to monitor residual chlorine in real time, so as to regulate the dosage of chlorine disinfectants accurately.