Aiming　at　the　problem　of　time　delay　affecting　stable　control　in　municipal　wastewater　treatment　processes,　an　adaptive　sliding　mode　control　(ASMC)　method　is　proposed　in　this　paper.　First,　the　influence　of　push-flow　time　delay　on　biochemical　reaction　process　of　wastewater　treatment　processes　is　analyzed.　Then,　an　operating　control　model　of　wastewater　treatment　processes　is　established.　Second,　an　estimated　compensation　model,　based　on　fuzzy　neural　network,　is　designed.　Then,　it　can　complete　the　accurate　prediction　of　delay　variables　and　realize　the　moment　unification　of　variables　in　the　control　model.　Finally,　a　sliding　mode　controller　(SMC)　with　adaptive　switching　gain　coefficient　is　designed.　Then,　it　can　realize　stable　control　of　dissolved　oxygen　and　nitrate　nitrogen.　The　proposed　method　is　applied　to　the　benchmark　simulation　model.　Experimental　results　show　it　can　realize　stable　control　of　wastewater　treatment　operating　process.　©　2023　Science　Press.　All　rights　reserved.