Global Ultraviolet Light Disinfection Market By Type (Ordinary Cathode Low Pressure Mercury Uv Disinfection, High-Intensity Ultraviolet Disinfection, and Ozone Uv Disinfection), By Application (Drinking Water and Wastewater, Air and Surface, and Food Processing), By Region and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028