Does this SciFi plot about quantum singularity violate laws of physics?

I'm writing a science fiction, although I'm not from a physics background. A part of my plot is:

In a futuristic Earth threatened by huge power demand and climate change, a scientist creates a quantum singularity to generate power.

Garbage is thrown into the quantum black hole, which is then converted into clean energy, used to meet the world's power demand.

It was hypothesized that once the mini singularity reaches a certain, manageable size, they'd stop feeding it, and it would spontaneously decay by Hawking Radiation.

But to the world's horror, the artificial quantum singularity never decayed by Hawking Radiation, and now poses a threat to the whole world.

Does this plot violate laws of physics, or is it feasible in a futuristic Earth with access to much better technologies? Could you please suggest anything else, if there are plot-holes?

posted over 8 years ago

Bagho‭

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