Can boiling water without high temperatures kill bacteria?
No, you do need to reach high temperates to kill the bacteria.

It's not about the evaporation, or the pressure that kills bacteria, rather it is the temperature that does. Higher temperatures have drastic effects on the molecular structures that occur within the bacteria, such as the denaturing of various proteins present inside the cell. As a result, if you wish to boil water to kill it, it must be done at an elevated temperature.

Wikipedia mentions that the optimum temperature for killing microbes is around 70°C,


  Boiling water is used as a method of making it potable by killing microbes that may be present. The sensitivity of different micro-organisms to heat varies, but if water is held at 70°C (158°F) for ten minutes, many organisms are killed, but some are more resistant to heat and require one minute at the boiling point of water.