Effect of weathering on the mobility of zinc in municipal solid waste incinerator bottom ash

► Weathering treatment can change the fractionation of Zn in MSWI bottom ash and increase its potential leaching. ► Zn leaching decreases in SPLP procedure but increases in TCLP procedure due to the weathering treatment. ► The decreasing of the Zn leaching in SPLP procedure can be attributed to the increase of aluminum (hydr)-oxides.