Bayonne, NJ Combined Sewer Overflow Treatment Demonstration Project: Disinfection Results

A CSO pilot treatment program has been completed in Bayonne, New Jersey. The project focused on verifying performance of selected technologies for TSS removal and disinfection under field conditions. Following pretreatment for TSS removal in several alternative processes, the effluent was disinfected with peracetic acid (PAA) or ultraviolet (UV) light utilizing low-pressure and medium-pressure lamps. The test units had a design capacity of between 189 and 3,785 L/min (50 to 1,000 gpm) and were fed from an extensive CSO catchment area. PAA effectiveness was a function of the dose applied as normalized by COD for E. coli, fecal coliforms and Enterococci. Three (3) log reduction (deactivation) was achieved, on average, at 0.010 mg/L PAA dose per mg/L of COD present. Similar deactivation was achieved by UV dose of 25 mJ/cm2 for low-pressure UV system and by 40 mJ/cm2 for medium-pressure system.