yes you can put them in household waste according to my local council. That is unless you have covid or are self isolating or in quarantine and then you have to double bag and store the bag for some time before putting out in the bin. Are you saying you wash and re-use single use masks? its NOT a good idea.
Putting out waste if you have coronavirus
The way you put out your black sacks or clear sacks for collection must change if you or anyone in your household:
has confirmed coronavirus
has symptoms of coronavirus
is self-isolating.
Double-bag your personal waste.
Put personal waste such as used tissues and disposable cleaning cloth in a bag, then in a second bag.
Tie these bags securely and keep separate from other waste in the rooms where you are self-isolating.
Put these bags into your black sack for collection.
Do not put your sacks out for collection for at least three days.
For example, if you have filled/tied a bag on Monday and your collection is on Thursday, you can put that bag out for collection on Thursday morning.
If you have filled/tied a bag on Monday and your collection is on Wednesday, store that bag at home until your collection day the following week.
you could also check your own council's website?