Praying for the LORD to protect everyone in the Orphanage at night. May everyone sleep PEACEFULLY, with the LORD's PROTECTION, from these critters.
If you can keep pets and children, in a safe manner, you might try using some moth balls or mothball flakes, where you are seeing the snakes and scorpions. I know it works for rats and mice. They don't like the smell. Maybe you could hang some in the rooms where everyone is sleeping. You might also put out powdered lime, (like the kind ferfertlizing the ground, not the fruit) to get rid of snakes. Put it under the houses, in the yard, and in any garden area's. Lime irratates the snakes skin, and they won't come around. For scorpions, and snakes, make sure that there isn't any trash piles, including yard waste, nearby. You may want to remove any stone piles, or loose bricks, as both these like to hide in any of these areas. Since Scorpians are nocturnal, they eat many bugs. Make sure not to leave food or other edible materials out, and you may want to use something to combat the source of their food supply, by getting rid of insects. Another thing, is to make sure, all your windows, doors and also around pipes, are all sealed. This will limit the access, into the house. By putting out Lime Fertilizer, you won't have as many insects. We learned this, when we used it under our home. Just be carefull when spreading it. It is quite dusty, so wear something over your mouth and nose, when spreading.
For more about Fertilizer Lime:
http://en.wikipedia.org/wiki/Agricultural_limeand about handling and use of mothballs:
http://en.wikipedia.org/wiki/MothballsI'll see if I can find any other, natural detourants, that won't hurt the pets or children.