The key I think is to dry out the manure. If they can make a composting toilet, why cant they dry out the manure in a drying process and press it into hard bricks. for storage or something like that so it would not be so dangerous.
I think the problem is they dont want to spend money to find an environmental solution. There are probably ways to process the waste in a way that could eliminate the odor. I have been in this area and there are entire towns next to some of these cattle processing facilities that stink horribly. I dont see how people can stand to live there.