What type of joint on this Ikea waste pipe

[Vicdiy]

They are too small for compression, too bulky for solvent weld so ask yourself Whats left! I fear you are heading for trouble if you disconnect and reconnect those joints after 14yrs.
You sure you want to take this job on?

No I’m not!!
My sister in law is on her own and it wouldn’t be the first time I’ve started a job to help her and then think ‘ why did I start this’

 

[moonlight]

Probably better to renew the waste, Ikea don't seem to fit anything and a ribbed waste pipe on a kitchen, asking for trouble. She is lucky it has not blocked up in the past. Looks like the washing machine waste has tipped over too. If you are not confident in plumbing leave it to the experts. Could really do with a sort out.