Molten hard drives produce a lot of smoke
That said, @ceejayoz is correct. Thermite will do the job, but may not be permitted in your datacenter. If you are not allowed to use thermite and you do not have a data-destruction policy and procedure that outline the only approved ways to wipe your data, then you can
1) Assume that a single pass of zeros is sufficient. This is not spinning rust. The methods used to recover data on spinning rust do not apply in the same way to SSD's.
2) You will need to perform multiple tests to determine the maximun number of write threads you can use on your SSD before you saturate any of the bottlenecks between your CPU cores and your drive.
3) Once you have determined the number of threads you can write to your SSD without diminishing returns, then split up a
dd job into multiple processes using
taskset and assign each one to its own CPU core with its own range of blocks to zero out.
dd if=/dev/zero of=/dev/sd__DEVICE__ bs=1M count= seek=
You will need to determine the count/seek numbers based on how you split up the size of your drive(s). That calculation is beyond the scope of my answer, as I need to leave the building in a minute.
To zero out the drive any faster will require Ceejayoz's method. If using thermite, you should consider first getting training on the proper handling and usage of this material and check with local fire authorities prior to incineration.
Encryption Ahead of Time Helps
You can of course use
cryptsetup to encrypt your drives, assuming you have a strong and long passphrase and don't store a key in clear text on the unencrypted portion of your drive, as I see many people do.
Encrypting your drive will reduce the risk of data exposure should any blocks not be overwritten by
dd. Some blocks are reserved for error handling and there is no guarentee that you will have zero'd them out and that they do not contain sensitive data.
Note: If you are going to
dd zero a drive that is encrypted, first dismount it and force the block size in dd, or
dd will read the existing 4k block size and your
dd wipe will take aeons. e.g.
cryptsetup remove /dev/mapper/trump2016 then do your wipe.