In　a　groundwater　plant　we　carried　out　a　process　operation　test　of　biological　removal　of　iron　and　manganese　nitrification　coupled　with　completely　autotrophic　ammonium　removal　over　nitrite　(CANON)　(Fe()　2.91-6.35　mg•L-1,　Mn()　0.47-0.98　mg•L-1,　NH4+-N　1.15-2.26　mg•L-1)　at　low　temperature　(6-8),　to　explore　the　effects　of　filter　speed　and　water　quality　on　ammonia　nitrogen　removal.　The　results　showed　that　the　mature　low-temperature　biological　filter　column,　which　had　been　out　of　service　for　one　month,　was　cultured　for　40　days　at　a　filtration　rate　of　2　m•h-1　and　successfully　started.　In　this　process,　when　the　water　inlet　concentration　remained　the　same,　the　improved　filter　speed　would　reduce　the　efficiency　of　ammonia　nitrogen　capture　by　the　filter　column,　increase　the　concentration　of　ammonia　nitrogen　in　the　depth　of　the　filter　layer,　and　improve　the　efficiency　of　ammonia　nitrogen　ions　capture　by　anaerobic　ammonia　oxidation　bacteria　(AnAOB)　in　the　depth　of　the　filter　layer,　so　that　the　ammonia　nitrogen　removed　by　CANON　in　the　water　increased,　while　the　ammonia　nitrogen　removed　by　nitrification　decreased.　When　the　filter　speed　remained　unchanged,　the　concentration　of　ammonia　nitrogen　in　water　was　increased　to　make　the　ammonia　nitrogen　with　higher　concentration　enter　the　filter　layer,　which　increased　the　concentration　of　ammonia　nitrogen　in　the　zone　where　ammonia　nitrogen　and　nitrous　nitrogen　coexist,　and　improved　the　net　catching　efficiency　of　AnAOB　on　ammonia　nitrogen　ions　in　the　filter　layer,　thus　resulting　in　an　increase　in　ammonia　nitrogen　removed　by　CANON.　©　2020,　Science　Press.　All　right　reserved.