Metals pollution tracing in the sewerage network using the diffusive gradients in thin films technique

Area of Science:

• Environmental Science
• Analytical Chemistry
• Water Quality Monitoring

Background:

• Sewage systems often face challenges with trace metals pollution.
• Accurate in situ monitoring is crucial for identifying pollution sources.
• Passive sampling techniques offer potential for cost-effective environmental assessment.

Purpose of the Study:

• To investigate the efficacy of Diffusive Gradients in Thin-films (DGT) for tracing metals pollution in sewer systems.
• To assess the feasibility of DGT deployment and methodology within sewer environments.
• To identify specific locations with elevated metal concentrations within a sewage catchment.

Main Methods:

• Deployed DGT devices in sewage pumping stations and manholes for in situ measurements.
• Monitored environmental parameters like temperature and pH to ensure DGT operational limits.
• Examined optimal deployment durations for DGT in sewer conditions.

Main Results:

• DGT successfully identified locations with excess metal concentrations, aiding pollution source tracing.
• While not fully quantitative, DGT results provided valuable qualitative data for pollution assessment.
• The DGT technique proved user-friendly, requiring minimal equipment and training for sewer deployment.

Conclusions:

• Diffusive Gradients in Thin-films (DGT) is a viable tool for identifying hotspots of metals pollution in sewer networks.
• The methodology is adaptable for in situ sewer monitoring, offering practical advantages.
• This study represents a novel application of DGT for in situ metals pollution tracing in sewage systems.