No. Radioactive materials decay at the same rate no matter what you do to them.
> the effects of the uranium is largely mitigated
Very different from decaying faster. It's possible that by covering it in algae you block the radiation from escaping. But the algae is still going to have to sit there for 10000 years without moving before the waste is decayed. You're better off sticking it inside lead.
No. Radioactive materials decay at the same rate no matter what you do to them.
> the effects of the uranium is largely mitigated
Very different from decaying faster. It's possible that by covering it in algae you block the radiation from escaping. But the algae is still going to have to sit there for 10000 years without moving before the waste is decayed. You're better off sticking it inside lead.