It is estimated to take from 450 to 1000 years for a printer cartridge to break down in landfill.
See ink cartridge
Reduce the need for ink and toner cartridges by viewing documents online.
Use draft-mode printing to save ink where practical.
Purchase refilled ink cartridges instead of buying new.
Ink and toner cartridges can be recycled at Cartridge World and Warehouse Stationery.
Please keep from landfill wherever possible.