In general 180F will kill most non-spore forming bacteria. Most of the time, when an organism (bacteria or parasite) can form a cyst, boiling will be your only option. Even then there are heat resistant organisms that will survive boiling. Although, many or most of the pathogenic (disease causing) organisms, will be destroyed by boiling.

As to food that has spoiled, keep in mind that some bacterial toxins are heat stable and even if you heat the food, the toxins will still be present and can cause illness. That is why you should keep hot foods hot and cold foods cold, to prevent bacteria from growing in the first place. Some bacteria produce exotoxins, in that, while the organism is living, it will produce and eliminate these toxins, these toxins may or may not be heat stable. The other situation is where an organism will produce endotoxins, these are generally release when the organism dies, lyses (pops open) and releases these toxins. Again, they may be heat stable.

Cans that have bulges, would indicate the possible presence of anaerobic bacteria (bacteria that grow without oxygen being present), such as Clostridium botulinum. Food from these cans should not be consumed under any conditions, as you may develop botulism, a life threatening illness.

Pete