Abstract:The start-up of Anammox process is very long due to the slow growth rate of the autotrophic anammox bacteria.The laboratory-scale study was carried out on the fast start-up of anaerobic ammonium oxidation in an up-flow anaerobic sludge bed with synthetic raw water(influent Total Nitrogen =200 mg/L,pH =7.5 ~7.8),and with anammox granule sludge stored at ambient temperature as the raw sludge feed.The results showed that quick start-up of anammox reactor was obtained after 68 day’s operation under the temperature of 33~35 ℃ by the decrease of hydraulic retention time.The ratio of NH4+-N removal,NO2--N removal and NO3--N production for the reactor was 1∶1.08∶0.26。 The reactor was operated stably and efficiently,and the NH4+-N and NO2--N removal was 90%,99% respectively under hydraulic retention time of 4 hours and organic loading rate of 1.2 kg/m3.d.During the operation,the color of the sludge was changed from black to reddish brown,and with excellent settling performance with settling velocity of between 20~78 m/h.
