Sounds like you need to be drumming up opposition with your neighbors and making the lives of the County Commissioners and the members of the zoning board a living hell to get this squashed. I am surrounded by chicken houses. I live 12 miles from the chicken processing capitol of the world. Everyone with more than five acres has at least one chicken house it seems. I can't smell them except for rarely when I pass them. Lots of folks move into new, swanky neighborhoods built against these smaller properties and then go nuts trying to get them shut down. They are rarely successful.

On the other hand, I've seen where Fieldale has tried to build new rendering plants and they have been beat off by the local residents. It's just business to the company but personal to the residents. Chasing them off once is winning a skirmish, not a battle and certainly not the war.