That you didn't have a successful perc test that was a contingency prior to your buying the land.
As I see it, you have two possibilities.
One is a holding tank that you would have to have pumped out frequently as it fills up. This has low initial cost, but high maintenance costs with frequent pumping out by a septic truck.
The second would be a "mound system" These have high initial costs, but little maintenance.
Go to Google Search and look up "mound systems" There are several good explanations there.
I would also check with your county area sanitation officer for recommendations.