Benefits of Onsite Generation of SO2-Bilsulfite for Dechlorination
Sulfites/bisulfites/SO2 are commonly used to remove residual chlorine from disinfected wastewater to protect plants and aquatic life. When pH adjusted and irradiated with ultrasound, ultraviolet light, microwaving, and electron beams, they form highly reactive reducing radicals, which degrade nitrates and perchlorates up to 70% without bioremediation. These advanced reduction processes avoid many of the problems with current water treatment techniques, such as ion exchange, reverse osmosis, and nanofiltration/ultrafiltration, which only concentrate the contaminant without degrading or eliminating it. Not only are conventional water treatment techniques slow reacting, they are more expensive to operate and difficult to monitor. The on-site generation of irradiated sulfites/bisulfites offers a new option for wastewater treatment improving water quality, while degrading difficult to remove pollutants.
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