An integrated mainstream and sidestream strategy for overcoming nitrite oxidizing bacteria adaptation in a continuous plug-flow nutrient removal process

An integrated mainstream aeration and sidestream sludge treatment was demonstrated to be effective in overcoming the adaptation of nitrite oxidizing bacteria (NOB) in an anoxic/oxic process. Results showed that by employing the alternating free nitrous acid and free ammonia (FNA/FA) sidestream sludge treatment alone, nitritation was established but varied, which was addressed by integrating alternating aeration with step feeding (ALASF) in reactor. Two critical considerations contributed to stable effluent nitrite accumulation (>83.8 %) and nitrogen removal (>83.0 %): 1) aerobic sludge rather than return sludge should be taken for FNA/FA treatment to avoid anoxic starvation which facilitated NOB recovery; 2) ALASF ensured timely denitritation and created constant anoxic disturbance for NOB inhibition. Nitrospira and Nitrobacter after 540-day operation were 0.38 % of seed sludge. A 20 % reduction of operating cost was obtained in this nitritation process. This study moved nitritation one step closer to application in continuous plug-flow process from municipal wastewater.

Automated summary

The study demonstrated that an integrated mainstream aeration and sidestream sludge treatment was effective in overcoming the adaptation of nitrite oxidizing bacteria (NOB) in an anoxic/oxic process, by utilizing alternating aeration with step feeding to address variations in nitritation. Key factors contributing to stable effluent nitrite accumulation and nitrogen removal included using aerobic sludge for FNA/FA treatment and ensuring timely denitritation and constant anoxic disturbance with ALASF.arseilleAlgiersSan FranciscoMálagaAmsterdamTorontoSanta CruzOuagadougouSydneyYangonRiyadhTokyoKinshasaSeoulBaghdadAlgiersMinskCape TownViennaStockholmUlaanbaatarBrusselsNashvilleBeijingAbu DhabiMogadishuHo Chi Minh CityBrusselsLos AngelesAlgiersMogadishuCairoSydneyRomeRio de JaneiroBaghdadMarrakeshMinskBeirutJerusalemHanoiOuagadougouNew York CityCasablancaRio de JaneiroTehranChicagoKinshasaHavanaSantiagoTehranSana'aLimaAlgiersKyotoBamakoParisKyivSão ToméAntananarivoSydneyJacksonvillePyongyangIstanbulAstanaKhartoumRabatPort-au-PrinceLuxembourg CitySevilleTaipeiVenicePort MoresbyJakartaShenzhenRiyadhLoméManaguaLilongweFort-de-FranceViennaLos AngelesColumbusVallettaCaracasSeoulLilongwePort MoresbyAthensAnkaraRigaMinskBanjulMonroviaAlmatyTripoliLimaMunichCotonouConakryLusakaKhartoumSuvaAnkaraDamascusSuvaSaint-DenisSaint-DenisCape TownBamakoYamoussoukroNairobiTehranMunichTel AvivCairoCape TownNew DelhiKanoOsloKhartoumBernIslamabadJakartaRomeBelmopanSuvaMinskDakarSkopjeKhartoumSuvaBandar Seri BegawanSaint-DenisChefchaouenKathmanduBrusselsSaint-DenisKigaliJubaKhartoumGaboroneLisbonNiameyColomboSofiaBamakoSaint-DenisTaipeiLisbonMuscatLuandaChiang MaiWashington, D.C.MadridKabulGibraltarBujumburaBerlinHavanaSaint-DenisSaint-DenisTunisMaputoSaint-DenisDar es SalaamBamakoAlmatyAbujaHanoiDohaDiliPodgoricaKingstownMuscatNew DelhiSingaporeNuukJubaBrazzavilleLuxembourg CityBissauDushanbeBernMalaboGeorgetownTel AvivReykjavíkMaseruJakartaAshgabatGibraltarAmmanRiyadhHoniaraBerlinKororBrusselsBakuFort-de-FranceAshgabatAnkaraBuenos AiresLa PazKampalaLobambaTbilisiSão ToméBridgetownLjubljanaTbilisiSaint-DenisBelmopanTallinnTiranaSaint-DenisTashkentSão ToméPort MoresbyPodgoricaMinskThimphuLilongweBamakoHavanaWindhoekSan JoséLos AngelesBrazzavilleBratislavaRiyadhAshgabatConakryAnkaraAbujaSukhumiSaint-DenisLjubljanaDoualaAshgabatAmmanDushanbeSukhumiBamakoSukhumiKigaliNouakchottBangkokJubaSaint-DenisRoseauAstanaBamakoBamakoBudapestSaint-DenisAnkaraAnkaraAstanaTallinnTunisCotonouSaint-DenisYerevanSaint-DenisSaint-DenisWashington, D.C.DakarBaghdadTiranaOuagadougouKathmanduKhartoumBamakoMaputoKigaliNovosibirskDamascusPorto-NovoTripoliTbilisiSukhumiButareRoseauCampo GrandeNairobiKabulMontevideoKingstownDakarSarajevoAbujaPort MoresbyPraiaLilongweBangkokSão ToméAshgabatMaputoKingstownNdjamenaBanjulOuagadougouMaputoBerlinSaint-DenisNoumeaMuscatAmmanBamakoBelmopanTbilisiIslas MalvinasPort MoresbyDublinAshgabatBandar Seri BegawanGazaSaint-DenisPort MoresbySaint-DenisBamakoKampalaKinshasaSaint-DenisMalaboSaint-DenisSaint-DenisBrusselsBridgetownBlantyreNdjamenaKingstownKigaliAshgabatBeijingBaghdadSaint-DenisSaint-DenisDamascusBaghdadNiameySaint-DenisMuscatBamakoBangkokRiyadhBlantyreBujumburaLilongweNouakchottPort MoresbySaint-DenisMaputoPodgoricaSão ToméSaint-DenisAvaruaKampalaSaint-DenisSaint-DenisHanoiRiyadhRomeSaint-DenisBridgetownSaint-DenisSaint-DenisRangoonDushanbeNouakchottSaint-DenisSaint-DenisBaghdadAmmanBangkokBelmopanTunisSaint-DenisLilongweMalaboSaint-DenisAntananarivoRiyadhBandar Seri BegawanMaseruMilanIslamabadMasqatAshgabatPodgoricaMaseruTashkentPort MoresbyPodgoricaSaint-DenisSaint-DenisBangkokSaint-DenisBerlinLilongweIslamabadDamascusSaint-DenisWindhoekBridgetownLilongweBamakoBrasíliaSaint-DenisPodgoricaLisbonPodgoricaKigaliSaint-DenisBamakoPodgoricaBamakoPodgoricaMaleSaint-DenisSaint-DenisKingstownSaint-DenisReykjavíkBandar Seri BegawanBujumburaAshgabatLjubljanaDushanbeSaint-DenisMangilaoMuscatSaint-DenisBamakoKigaliSaint-DenisBridgetownSaint-DenisSaint-DenisLondonBelmopanAsmaraNdjamenaKampalaDushanbeDublinSaint-DenisSaint-DenisRiyadhAshgabatBrusselsGibraltarDushanbeSaint-DenisLilongweSaint-DenisBridgetownDushanbeSaint-DenisPodgoricaAmmanSaint-Den