The primary issue is whether WWTP discharge permits should be modified to further encourage the use of alternative disinfection technologies. Sodium hypochlorite liquid. Sodium hypochlorite and sodium bisulfite. Each technology has specific advantages and disadvantages, which follow. Chlorine cylinders are widely available, and chlorine injection systems are proven and reliable.
Chlorine is a very effective disinfectant.
A residual is maintained to inhibit regrowth of bacteria. This technology offers shorter treatment times. UV disinfection presents no safety, handling, flammability or explosion issues. With ozonation, a powerful chemical oxidizing agent produces a disinfected effluent in shorter contact times than those required by chlorine. The effluent quality is enhanced as a result of the increased removal of biological oxygen demand, chemical oxygen demand, total suspended solids and color.