The European Water Framework Directive (WFD) dictates a monitoring requirement for surface and ground water quantity, quality and ecological status.
Chelsea Technologies Group has addressed the challenge of monitoring of effluents in surface waters with the low cost BACTI-Wader & BACTI-Wader Pro which provide real-time, highly sensitive measurements for in situ indication of bacteria levels. The BACTI-Wader comprises a UviLux fluorometer and a Hawk handheld display and logging unit. CTG’s UviLux fluorometers detect UV fluorescence with industry-leading sensitivity and selectivity and have been optimised for minimal interference from water turbidity
The principle behind the measurement is the excitation of Tryptophan-like UV fluorescence, which is known to correlate with bacterial loading, and provides an output in Tryptophan concentration units. The use of fluorescence provides signal detection sensitivity far superior to optical absorption methods.
- River pollution surveillance and investigative monitoring
- Bathing water quality monitoring
- Point source pollution surveys
- Farm run-off detection and tracking
- Assessment of bathing & shellfish waters
- Groundwater quality monitoring
- Combined Sewage Overflow (CSO) event detection
- Faecal Indicator (FI) monitoring
The BACTI-Wader sensors are effective tools for monitoring coastal waters to detect outflow events from waste water treatment works (such as Combined Sewage Overflows) and farm slurry. They have also been used to monitor river catchments against the EU Water Framework Directive. They have beeen deployed in permanent stations for surveillance and operational monitoring and as portable systems for investigative monitoring. These sensors have also been used in monitoring the requirements of both the EU Shellfish Waters Directive and Bathing Waters Directive.
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 & faecal contamination of wastewaters. 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.