WASTEWATERBy Rick LallishWhat superior disinfection process is created on site, is done in an enclosed tank, and produces off-gas that must be destroyed before release to the atmosphere?A. OzonationB. ChlorineC. Peracetic acidD. Ultraviolet radiationAnswer: A. The ozonation process involves the creation of ozone by feeding oxygen through electrodes (6,000-20,000 volts). This creates ozone, which can be used as disinfectant. The gas is highly unstable, but when dosed properly, it is very efficient at disinfecting wastewater effluent of bacteria, viruses, protozoa and other microorganisms as well as some contaminants of emerging concern. However, the off-gas is extremely hazardous and must be destroyed or recycled before
