There’s two different forms of interference on that …
#1. The slowly pulsating deep hum at 90Hz, which is probably derived from 60Hz mains electricity.
and #2. the constant whine at 1kHz and multiples thereof, (2kHz, 3kHz, 4kHz, etc),
The pulsating deep tone is fixable with a notch filter to remove 90Hz.
The whine requires several notches at 1kHz intervals, there’s an Audacity plugin designed to do that : Mosquito Killer.
Use the least number of notches to remove the interference as notches also cause collateral-damage to the sound you’re recording, (e.g. maybe use Mosquito-Killer on 4 notches rather than 6 ).