In OSX 10.10 there was an option to go to
Finder > Empty Trash or
Finder > Secure Empty Trash
In OSX 10.11 there now only seems to be an option for
Finder > Empty Trash
Any ideas way i can get it back ?
It was deliberately removed by Apple, so can't be renabled. There are work-arounds, eg. using srm on the command-line, or third party secure delete products.
Finder Available for: Mac OS X v10.6.8 and later Impact: The "Secure Empty Trash" feature may not securely delete files placed in the Trash Description: An issue existed in guaranteeing secure deletion of Trash files on some systems, such as those with flash storage. This issue was addressed by removing the "Secure Empty Trash" option. CVE-ID CVE-2015-5901 : Apple
You could sort of get this functionality back by instead deleting the file via the Terminal with the rm utility's option to overwrite a file before it's reference is deleted from the filesystem.
rm -P filename
"-P Overwrite regular files before deleting them. Files are overwritten three times, first with the byte pattern 0xff, then 0x00, and then 0xff again, before they are deleted"