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Once this pandemic blows over, its a sight that might greet you when you return to work, or as you enter a mall, market, railway station, airport or any other place where a large number of people gather. They are called Disinfection Tunnels. As you pass through them, sometimes after washing your hands, nozzles spray a disinfectant mist on you which reportedly kills most germs and viruses, including, hopefully, the COVID-19.
Versions of these tunnels are already up and running at various places in the country, including several farmers markets, police stations and other public places in Tamil Nadu, Karnataka, Telangana, Kashmir, West Bengal and Kerala, Bihar, Uttar Pradesh, Delhi NCR and Punjab, and the list is rapidly growing.
Essentially these tunnels spray a mist of sodium hypochlorite solution, a chlorine compound often used as a disinfectant or a bleaching agent, as you pass through them. Sodium hypochlorite is a component of commercial bleaches and cleaning solutions and used as a disinfectant in drinking and waste water purification systems and swimming pools. In 0.5% w/v solution, it is called Dakins solution and used as an antiseptic to clean infected topical wounds. The spray used by most Indian tunnels, like the one in a large market in Tamil Nadus Tiruppur district, is 1 per cent solution.
These tunnels come in various shapes, sizes and costs, and range from basic contraptions which cost less than 10,000 rupees to high-end steel and chrome tunnels with various sensors and conveyor belts and traffic lights which cost Rs 25 lakh.