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Hello, It is not possible to predict what happens, most likely nothing happens because ground glass powder is likely to pass unchanged in feces. Minor abrasions may occur along the passage, right up to anus but will heal soon. No damage to kidneys is possible because there is no question of any particle reaching there. Gut lining will not absorb any. So no particle can circulate in blood.
It may take 48-72 hours for the glass particles to traverse the gut length and some particles may linger in large gut a bit longer.