BISM中文Connect water quality along the flow path, processes inside the biofilm and exchange with sewer air.
Understanding changing microbial processes is the starting point for sustainable sewer control strategies.
As wastewater remains in a pipe, oxygen is consumed and oxygen-depleted zones develop inside the wall biofilm. SRB use organic matter to reduce sulfate to sulfide. Under acidic conditions, sulfide forms H₂S that escapes into sewer air. H₂S causes odor and can be oxidized to sulfuric acid on concrete surfaces, causing corrosion.
Biofilms grow, detach and recover. After biocide dosing or flushing, SRB may regrow within days to a couple of weeks. BISM focuses on this rebound time to assess how long an intervention remains effective and when further control is needed.
A dynamic biofilm core couples gas, water and biofilm processes, extending immediate water quality predictions to long-term odor control assessment. BISM supports gravity and pressure sewers with circular or rectangular cross-sections.
Connect water quality along the flow path, processes inside the biofilm and exchange with sewer air.
Tracks dynamic concentrations of sulfide, sulfate, ammonium and organic matter as wastewater moves through the sewer.
Divides the wall biofilm into thin layers to simulate growth, competition, attachment and detachment of SRB, heterotrophs and other organisms at different depths.
Calculates H₂S transfer from water to air and oxygen reaeration to assess the risk of H₂S release.
Calibration and validation use observations from separate stages to compare dissolved sulfide over time. These comparisons support sulfide prediction and odor mitigation assessment in large-scale pressurized sewers.
Related publication · Water Research, 2019 ↗