Currently,　partial　nitrification　(PN)　processes　are　commonly　used　to　improve　efficiency　in　high　ammonia　nitrogen　wastewaters.　However,　initiating　and　restoring　damaged　PN　performance　is　crucial　for　optimizing　nitrogen　removal　efficiency　without　the　use　of　chemical　additives.　In　this　study,　a　simultaneous　partial　nitrification　and　denitrification　coupled　with　anammox　(SPNAD)　sequencing　batch　biofilm　reactor　was　constructed　to　treat　anaerobic　digestion　after　sludge　thermal　hydrolysis　pretreatment　(STHP-AD)　filtrate.　The　PN　performance　was　successfully　recovered　through　optimizing　the　operation　mode　of　anoxic/oxic　alternation　within　120　days.　Result　showed　that　Nitrosomonas　increased　from　0.68　%　to　3.43　%,　while　Nitrospira　decreased　to　0.06　%.　The　PN　recovery　also　promoted　anammox,　with　the　only　anammox　bacterium　of　Candidatus　Brocadia,　detected　in　the　mixing　and　biofilm　sludge　of　1.73　%　and　1.41　%,　respectively.　The　autotrophic　denitrifying　bacteria　Thermomonas　(increasing　from　0.47　%　to　23.85　%)　and　Truepera　(rising　from　2.31　%　to　6.54　%)　rapidly　accumulated.　After　adjusting　to　the　anoxic/oxic　alternation　ratio,　the　hydraulic　retention　time　was　shortened　from　50　h　to　37.5　h,　and　the　oxic　time　was　reduced　to　half　of　the　initial　operation.　The　PN　recovery　and　anammox　enrichment　resulted　in　improving　nitrogen　removal　approximately　20　%.　Eventually,　the　SPNAD　system　realizes　stable　and　efficient　nitrogen　removal　with　the　influent　nitrogen　loading　rate　of　0.43　kgN/(m3　&　sdot;d),　the　ammonium　removal　efficiency　of　94.73　+/-　3.27　%,　and　the　nitrogen　removal　efficiency　of　72.98　+/-　1.27　%.　In　this　study,　a　new　strategy　using　intermittent　aeration　while　appropriately　extending　the　oxic　time　was　proposed　to　restore　the　system＇s　ability　to　treat　STHP-AD　filtrate　after　PN　disruption.