3. Conclusion

Every activity generates waste. Some of this waste can be used to manufacture new objects, or to produce energy or fuel. The notion of waste is relative, since it depends on the technologies available and their capacity to give it a new life. When all possible avenues for recycling have been exhausted, what remains is ultimate waste, which is not economically recoverable with current technologies or has no application either now or in the near future. Among possible recovery methods, energy production or the manufacture of fuels is a route that depends on the nature of the waste. We have seen throughout this article that, depending on the type of waste, energy recovery is more or less important. It is used in the absence of other, more noble forms of recovery, such as material reuse, because energy production generally destroys the initial waste, leaving only ash.

...