Most alcohol disinfectants have an alcohol concentration of 60% or more and are "dangerous goods" under the Fire Service Law. It is volatile and easily flammable, so fire is strictly prohibited.
In all of Tokyo's 23 wards, there was no word for alcohol disinfectant on the household garbage sorting table. If there is a small amount of surplus, soak it into rags and waste paper after drying and then burn garbage. If a large surplus cannot be processed by this method, ask a specialist who processes chemicals.