AutoRemovePlus is a plugin for Deluge that you can use to automatically remove torrents. Its based on AutoRemove 0.1 by Jamie Lennox.

This is a GtkUI and WebUI plugin.

• Select how many torrents are allowed at the same time.
• Choose to remove them based on multiple criteria age, seed time or ratio.
• Select if torrents have to fulfill both or either criteria.
• Delete torrents in order (e.g. delete torrents with highest ratio first).
• Don't remove torrents if they don't reach a minimum time (in days) or ratio.
• Choose the removal interval.
• Right click and select torrents that you don't want automatically removed.
• Remove torrent data option.
• Create an exempted tracker list, so that torrents that belong to those trackers are not removed.
• Fully functional WebUI.

Look for torrents to remove every day:

Check every: 1

Look for torrents to remove every hour:

Check every: 0.0416

Remove every torrent that meets minimum criteria:

Maximum torrents: 0

Don't remove torrents unless Deluge has over 500:

Maximum torrents: 500

Remove torrents that have a ratio over 2.0 and have been seeding for at least 4 days:

Remove by: Ratio, Min: 2.0, and, Remove by: Seed Time, Min: 4

Remove torrents that have a ratio over 2.0 or have been seeding for at least 4 days:

Remove by: Ratio, Min: 2.0, or, Remove by: Seed Time, Min: 4

Remove torrents only according to first criteria:

Remove by: Ratio, Min: 2.0, and, Remove by: Seed Time, Min: 0 (second condition needs to be always true with and)

The rest of the options are pretty self explanatory