In preparation for a blizzard, a city dispatches a crew to spread salt on the street surface of the bridges around town. the salt is spread on the streets because it will likely change the freezing point of water from to

0 degrees to -6 or -16 degrees Celsius

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.

Idon't know hope someone you