Start-Up of Anammox Process Using Municipal Sewage Sludge in One UASB Reactor

Abstract

Using municipal sewage treatment plant sludge as the inoculation sludge, anaerobic ammonia oxidation experiment started in a UASB reactor with an effective volume of 3.5L. The experiment lasted 116d, experimental medium term, the system NH4+-N, NO2--N removal rates were above 50%. Changing influent load will cause a greater impact on the reactor, resulting in fluctuations of NH4+-N and NO2--N removal rate. Late, NO2--N / NH4+-N values ​​remain at around 1. The sludge in the reactor changed from gray-brown to pink. The system is more stable for removing NH4+-N and NO2--N.