Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
Bioresour Technol. 2016 Sep;216:562-70. doi: 10.1016/j.biortech.2016.05.079. Epub 2016 May 24.
A novel funnel-shaped internals was proposed to enhance the stability and pollutant removal performance of an aerobic granular process by optimizing granule size distribution. Results showed up to 68.3±1.4% of granules in novel reactor (R1) were situated in optimal size range (700-1900μm) compared to less than 29.7±1.1% in conventional reactor (R2), and overgrowth of large granules was effectively suppressed without requiring additional energy. Consequently, higher total nitrogen (TN) removal (81.6±2.1%) achieved in R1 than in R2 (48.1±2.7%). Hydraulic analysis revealed the existence of selectively assigning hydraulic pressure in R1. The total shear rate (τtotal) on large granules was 3.07±0.14 times higher than that of R2, while τtotal of small granules in R1 was 70.7±4.6% in R2. Furthermore, large granules in R1 with intact extracellular polymeric substances (EPS) outer layer structure entrapped hydroxyapatite at center, which formed a core structure and further enhanced the stability of aerobic granules.
提出了一种新型的漏斗形内件，通过优化颗粒粒径分布来提高好氧颗粒工艺的稳定性和污染物去除性能。结果表明，新型反应器（R1）中处于最佳粒径范围（700-1900μm）的颗粒高达 68.3±1.4%，而传统反应器（R2）中不到 29.7±1.1%，并且无需额外的能量即可有效抑制大颗粒的过度生长。因此，R1 中的总氮（TN）去除率（81.6±2.1%）高于 R2（48.1±2.7%）。水力分析表明，R1 中存在选择性分配水力压力的现象。大颗粒上的总剪切速率（τtotal）比 R2 高 3.07±0.14 倍，而 R1 中小颗粒上的τtotal 比 R2 高 70.7±4.6%。此外，R1 中的大颗粒具有完整的细胞外聚合物（EPS）外层结构，内部包裹羟基磷灰石，形成了核心结构，进一步增强了好氧颗粒的稳定性。
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