I wouldn't bother about the disinfectant, the less chemicals you put on your land the better :)If you don't bother with the lime either between every batch, I would rest the ground for 6-8 weeks between batches and lime once a year then re-site your run for the next year's worth. I would, though, rake the ground thoroughly between batches and give it a really good watering. Also include a non-chemical wormer in the feed right from the start.