Guys, y'all have your panties in a bigger wad than the whole TSA after the lady got caught actually breast feeding an alleged baby... Oh, the horror...
Pitch it in the trash. Not in YOUR trash compactor, or down your garbage disposal. Just in the trash. If you burn your trash, try not to stand in the barrel or within 18" of the fire. If your trash is picked up, big deal - if they're not worried about paint or bug spray cans, etc., etc., then they ain't gonna be worried about a little old primer.