methanol removal from glycerin

hi there i am wondering how much most people out there are able to remove meth from say a hundred litres of glycerin i have been doing this for aboutt six years now and i only seem to get 60 to maybe 70 litres out of 220 litres of waste glycerin if that is all i can get out of it i an thinking just burning the glycerin in a babington burner style furnace rather then going through all the hassle of running the still not to mention the electricicity it consumes thnaks in adwance.