to expect my lodgers to take out the recycling and rubbish once in a while.....

[kikishushu]

or is that my job, because it's my house? Would be nice if they offered to help with the housework too but I guess thats asking too much!

They probably need to be asked!

You need to ask, and imo it depends on what facilities they are sharing with you.

Can you not suggest/discuss some kind of roster that everyone agrees to?

Yes, you should ask them.
I wouldnt do housework if I lodged in someone elses house either I have to say!
I'd keep my own room tidy and obviously wash up dishes I used, clean mess I made etc but I wouldnt do the general houseowrk for them!