Echoing　to　the　call　of　recovering　high-value-added　chemicals　from　wastewater　and　achieving　carbon-neutral　operation　in　wastewater　treatment,　an　anammox　upflow　hybrid　reactor　was　successfully　applied　for　nitrogen　removal,　and　the　potential　for　phosphorus　recovery　was　put　forward.　Moreover,　the　spatial　pattern　of　removal　capacities,　and　distribution　of　biomass　and　HAP　precipitates　were　recognized　and　demonstrated　as　heightoriented.　The　intensity　of　HAP　precipitates　was　highly　consistent　with　the　amount　of　anammox　biomass　and　the　relative　abundance　of　the　Candidatus　Kuenenia,　indicating　that　HAP　formation　was　encouraged　by　the　anammox　reaction　itself　and　heterogeneous　nucleation　induced　by　organic　matters　(proteins　and　polysaccharides).　The　fixed　bed　also　played　an　important　role　in　immobilizing　the　anammox　biomass,　secreted　organic　matrix,　and　HAP　precipitates.　This　finding　also　provoked　the　thought　that　in　the　anammox　process,　HAP　precipitation　was　more　achievable,　effective　and　practicable　using　the　fixed-carrier　system.