低盐度对EGSB厌氧氨氧化反应器启动和运行的影响

考察了低盐度(以NaCl计,w/v)对厌氧氨氧化反应器启动和运行的影响。在水力停留时间为11 h的条件下,以普通活性污泥为接种污泥,分别以进水盐度为8 g/L和进水不含盐度启动并运行厌氧氨氧化反应器。结果表明,进水含有盐度和进水不含盐反应器启动时间分别为125 d和107 d,总氮去除率分别为(73.0±13.9)%和(78.4±3.7)%。运行阶段,进水含有盐度反应器总氮去除率始终低于进水不含盐度反应器。随回流比提升,两反应器颗粒污泥中值粒径增大。在不同回流比条件下,进水含有盐度反应器颗粒污泥中值粒径均小于进水不含盐度反应器。当回流比为7时,进水含有盐度反应器颗粒污泥EPS中多糖、蛋白质和腐殖质的含量均低于进水不含盐度反应器。两反应器EPS多糖与蛋白质的比值分别为2.8和3.1。低盐度对EGSB厌氧氨氧化反应器的启动、运行和颗粒污泥的形成有一定的影响。

Effect of low salinity on start-up and operation of Anammox process in EGSB reactor

Effect of low salinity (NaCl, w/v) on start-up and operation of Anammox in EGSB reactor was investigated in this work. Two identical reactors were started and operated, while hydraulic retention time was 11 hours in each reactor. Normal activated sludge was applied as inoculated sludge. Different salinities (8 and 0 g/L) were applied in each reactor. Results indicate that the start-up of the two reactors could be achieved successfully in 125 days and 107 days, respectively. In addition, the removal efficiencies of total nitrogen in the two reactors were (73.0±13.9)% and (78.4±3.7)%, respectively, while the presence of low salinity resulted in lower removal efficiency during the operation. The size of median diameter increased with the increasing of reflux ratio in both two reactors. However, the presence of low salinity reduced the size of median diameter, compared to the case while no salinity was applied. While the reflux ratio was seven, low salinity resulted in less polysaccharide, protein and humus. In addition, the ratios of polysaccharide and protein of the two reactors were 2.8 and 3.1, respectively. The presence of low salinity affected the start-up, operation and the formation of granular sludge in EGSB reactor.