基于复合铁碳材料的好氧颗粒污泥培养及脱氮研究

Cultivation of Aerobic Granular Sludge Based on Iron-Carbon Composites and Its Denitrification Efficiency

通过投加复合铁碳材料,经过70 d,在序批式活性污泥反应器(SBR)内培养出粒径为0. 5～4 mm、具有良好脱氮效果的成熟好氧颗粒污泥。在此过程中复合铁碳材料在提高污泥沉降性、加快颗粒化进程、提高脱氮效率等方面发挥了积极的作用。成熟好氧颗粒污泥的脱氮性能会受到pH值、DO浓度、C/N值的影响,最佳pH值为7. 0、DO为(2. 0±0. 1) mg/L、C/N值为8,相应的NH_4^+-N去除率分别为95. 60%、95. 78%、97. 87%,TN去除率分别为93. 64%、94. 28%、96. 28%。

Mature aerobic granular sludge, with particle sizes of 0.5 - 4 mm and good denitrifica- tion efficiency, was cultivated in a sequencing batch activated sludge reactor （SBR） with the addition of iron - carbon composites. The iron - carbon composites contributed to sludge settling, granulation process and nitrogen removal efficiency. The denitrification performance of mature aerobic granular sludge was sensitive to pH value, DO concentration and C/N ratio. In the optimized condition when pH value was 7.0, DO was （2.0 ± 0.1 ） mg/L, and C/N ratio was 8, the NH4 -N removal rates were 95.60%, 95.78%, 97.87%, and TN removal rates were 93.64%, 94.28% and 96.28% , respectively.