In situ Real-time Monitoring of Bathing Water Quality

Chelsea Technologies Group (CTG) has addressed the challenge of monitoring of effluents in surface waters with the new BACTI-Wader & BACTI-Wader Pro systems. These systems provide real-time, highly sensitive measurements for in situ indication of bacteria levels.   The principle behind the measurement is the excitation of Tryptophan-like UV fluorescence, which correlates with bacterial contamination. The sensor detects fluorescent proteins that are inherent within sewage and slurry and provides an output in calibrated Tryptophan concentration units.


Bathing Water Monitoring
Monitoring the cleanliness of recreational beaches is becoming a worldwide issue (e.g. the EPA Beach Act in the USA and The Bathing Water Directive in Europe). The revised EU Bathing Waters Directive of 2015 now requires maintaining low levels of E Coli and Enterococci within Bathing Waters. Authorities responsible for these bathing waters require new tools to monitor levels of these bacteria in real-time. The BACTI-Wader & BACTI-Wader Pro offers a low cost, easily deployed, solution and can be sited close to bathing beaches and within nearby estuaries and rivers to provide early notification of potential non-compliance (e.g. resulting from agricultural run-off following high rainfall or CSO events). Offering un-paralleled sensitivity, the BACTI-Wader sensors can detect small changes in bacteria concentrations, offering the potential of setting alarms to warn when acceptable contamination levels are exceeded.


Applications include:

  • Bathing water quality monitoring
  • Effluent contamination monitoring
  • Faecal Indicator (FI) monitoring
  • Combined Sewage Overflow (CSO) event detection
  • Farm run-off detection and tracking
  • Storm event monitoring

In situ Real-time Monitoring of Bathing Water Quality


What is Tryptophan?
Tryptophan is an essential amino acid in human diet and is the main component of protein fluorescence. It is associated with microbial activity, i.e. from sewage and faecal contamination of waste waters. Published data over the past decade has clearly demonstrated a strong correlation between Tryptophan-like fluorescence and BOD.


Other Monitoring Parameters 
The BACTI-Wader & BACTI-Wader Pro are part of the family of UV fluorometers available from CTG. Other sensors in the range detect Polycyclic Aromatic Hydrocarbons (PAH), Coloured Dissolved Organic Matter (CDOM) and Optical Brighteners. Sensors in the wider Lux range include fluorometers for algal monitoring and a Turbidity sensor compliant with the ISO 7027:1999 standard for turbidity measurement, which all benefit from a wide range of common accessories providing cost-effective solutions to many deployment scenarios.

In view of our continual improvement, the designs and specifications of our products may vary from those described.