全自养脱氮颗粒污泥的培养及脱氮性能的恢复与强化

采用交替限氧-厌氧和低充放比(30%)运行模式,在SBR反应器中成功启动全自养脱氮(CANON)工艺,启动过程经历常规硝化主导阶段、短程硝化主导阶段和全自养脱氮阶段,总氮去除速率和总氮去除效率分别达到(312±15)mg/(L·d)和(71.2±4.3)%.培养得到的污泥中颗粒污泥(粒径3300μm)和絮状污泥(粒径<300μm)体积分别占污泥总体积的39%和61%.在自养脱氮性能恶化的SBR反应器进水中长期添加适量N2H4,反应器脱氮性能得以恢复甚至强化,反应器总氮去除速率升高到(480±34)mg/(L·d),颗粒污泥的比例增加到污泥总体积的51%.

The cultivation of completely autotrophic nitrogen removal over nitrite granular sludge and the recovery and enhancement of nitrogen removal

Complete autotrophic nitrogen removal over nitrite (CANON) process was successfully startedup with a low volumetric exchange ratio (30%) under alternative limited-oxygen/anaerobic mode in SBR, and the total nitrogen removal rate as well as the total nitrogen removal efficiency reached (312±15)mg/(L·d) and (71.2±4.3)%, respectively. The startup of CANON SBR experienced nitrification-leading phase, partitial-nitritation-leading phase and CANON phase in general. Granular biomass and floccular biomass were both found in SBR. The volume of granular biomass (radius3300μm) and floccular biomass (radius<300μm) made up 39% and 61% of total sludge volume, respectively. The long-term N2H4 addition recovered and enhanced their autotrophic nitrogen removal capacity, with the total nitrogen removal rate increased to (480±34)mg/(L·d). The proportion of granular biomass increased to 51% of total sludge volume.