Disposal of dog/cat 'manure'
I am developing an animal sanctuary for approx 60-70 LARGE dogs & cats who have "issues" and are not highly adoptable. As I develop my land, 20 acres, (rural) mostly pasture for horses, I must consider "poop" disposal due NO SEWERAGE. I understand, or think I understand, the issues of parasites but my options that I see are:
-scoop, bag and pay to put into landfill;
-"compost" and put on flowers/trees;
-vermicompost and put on flowers/trees;
-either of the 2 above and spread on horse pastures or
-holding tank with bacteria draining to "rock/reed" filter bed using specific natural plants with runoff to the ground.
Any comments appreciated