a Environmental Engineering Department , Middle East Technical University , Ankara , Turkey.
Environ Technol. 2014 Nov-Dec;35(21-24):2928-39. doi: 10.1080/09593330.2014.925513. Epub 2014 Jun 17.
The effects of two seed sludge types, namely conventional activated sludge (CAS) and membrane bioreactor sludge (MBS), on aerobic granulation were investigated. The treatment performances of the reactors were monitored during and after the granulation. Operational period of 37 days was described in three phases; Phase 1 corresponds to Days 1-10, Phase 2 (overloading conditions) to Days 11-27 and Phase 3 (recovery) to Days 28-37. Aerobic granules of 0.56 ± 0.23 to 2.48 ± 1.28 mm were successfully developed from both MBS and CAS. First granules appeared on Day 9 in both reactors, indicating that there was no difference between two seed sludge types in terms of the time period for granulation initiation. The results revealed that the granules developed from MBS performed better than CAS in terms of settleability, stability, biomass retention, adaptation, protection of granular structure at high loading rates (0.86 g N/L d and 3.92 g COD/L d) and low COD/TAN ratio (5). Granules of MBS were also found to be capable of providing better protection for nitrifiers at toxic free-ammonia concentrations (38-46 mg/L NH3-N), thus showing better treatment recovery than those of CAS.
考察了两种污泥类型，即传统活性污泥（CAS）和膜生物反应器污泥（MBS），对好氧颗粒化的影响。在颗粒化过程中和之后监测了反应器的处理性能。操作期为 37 天，分为三个阶段描述；第 1 阶段对应于第 1-10 天，第 2 阶段（过载条件）对应于第 11-27 天，第 3 阶段（恢复）对应于第 28-37 天。成功地从 MBS 和 CAS 中开发出了 0.56±0.23 至 2.48±1.28mm 的好氧颗粒。在两个反应器中，第 9 天首次出现颗粒，这表明两种污泥类型在颗粒化启动时间方面没有差异。结果表明，在高负荷率（0.86gN/Ld 和 3.92gCOD/Ld）和低 COD/TAN 比（5）下，MBS 开发的颗粒在沉降性、稳定性、生物量保留、适应性、颗粒结构保护方面的性能优于 CAS。还发现 MBS 颗粒能够在毒性游离氨浓度（38-46mg/LNH3-N）下为硝化菌提供更好的保护，因此比 CAS 颗粒具有更好的处理恢复能力。
