Hi Erin, welcome to the discussion. It sounds as if you have a lot of leeway in your system choice. That's a great start. Here's a list of different systems you could adopt:
http://www.wetlandsystems.ie/watertips.html
In summary;
you could fix up what you have or replace it
Use a treatment wetland, mechanical aeration unit, media filter unit, willow treatment or a source separation system or dry toilet approach.
After treatment you need to dispose of the effluent: usually to ground if you have the infiltration capacity in the soil.
Have a look elsewhere on these posts for
compost toilet information. I've got a summary of different types in my new book, but you'll also need to go and visit friends to see how they are getting on with their selected system. Remember that more expense does not necessarily equal a better system.
Hope that helps a bit. Feel free to send me on the site inspection details in a few months if you'd like me to have a look over them. Meanwhile, fire back any questions that seem pertinent...
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