You should not use mod_wsgi-standalone package. You should use the standard mod_wsgi package and ensure that system Apache development package is installed so that mod_wsgi is compiled against and uses it instead.
Next is that Trac provides only instructions for integrating with system Apache and does not provide instructions for integrating with mod_wsgi-express command line (which is another reason why can't use mod_wsgi-standalone package).
So it is unclear how you might even have set things up if trying to use mod_wsgi-express. Either way, the tracd process should not be running, as that isn't how things work if embedding Trac with Apache/mod_wsgi.
Instructions for using Trac with Apache/mod_wsgi can be found at:
Also be aware that Trac only supports Python 2.7 and you cannot use Python 3.0.
To be of any more help I would need to know more about how you are running things and configuring system Apache.