Successful granulation and microbial differentiation of activated sludge in anaerobic/anoxic/aerobic (A2O) reactor with two-zone sedimentation tank treating municipal sewage
Successful granulation and microbial differentiation of activated sludge in anaerobic/anoxic/aerobic (A2O) reactor with two-zone sedimentation tank treating municipal sewage
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DOI：
10.1016/j.watres.2020.115825
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发表时间：
2020-07-01
期刊：
影响因子：
12.8
通讯作者：
Li, Jun
中科院分区：
文献类型：
--
作者：
Liu, Wenlong;Wu, Yue;Li, Jun
采用A（2）O-TST反应器构建了一个连续中试规模的好氧颗粒污泥（AGS）处理真实的城市污水。研究了污泥颗粒化过程中污泥特性、营养物质去除性能及相应的微生物生态动态。试验结果表明，AGS反应器的平均粒径为210 μ m，30 min后的污泥体积指数为47.5 mL/g，反应器出水COD、总氮和总磷浓度分别为22.8、3.5和0.2 mg/L。此外，高通量数据表明，在沉淀池-1（ST-1）的颗粒窝藏缓慢生长的自养生物，如亚硝化单胞菌和硝化螺菌，而在沉淀池-2（ST-2）的絮体主要是由快速生长的异养生物，包括钙。累积杆菌属、脱氯单胞菌属、黄杆菌属、弓形杆菌属和盐单胞菌属。采用计算流体动力学和离散元法（CFD-DEM）模拟的模拟结果证实，TST分离器产生的选择压力有助于ST-1区重颗粒（密度>1.011 kg/m3）的保留和轻絮体（
A continuous pilot-scale A(2)O reactor with a two-zone sedimentation tank (A(2)O-TST) was constructed for the formation of aerobic granular sludge (AGS) to treat real municipal sewage. The characteristics of sludge, nutrient removal performance and the corresponding microbial ecology dynamics were studied during granulation process. Experimental results indicated that AGS with a mean particle size of 210 mu m and sludge volume index after 30 min of 47.5 mL/g was successfully formed with effluent COD, total nitrogen and total phosphorus concentrations in the reactor reaching 22.8, 3.5 and 0.2 mg/L, respectively. Furthermore, high throughput data indicated that granules in settling tank-1 (ST-1) harbored slow-growing autotrophic organisms like Nitrosomonas and Nitrospira, while the flocs in settling tank-2 (ST-2) were dominated by fast-growing heterotrophic organisms including Ca. Accumulibacter, Dechloromonas, Flavobacterium, Arcobacter and Halomonas. Simulation results using computational fluid dynamics and discrete element method (CFD-DEM) modeling verified that the selection pressure created by the TST separator contributed to the retention of heavy granules (>1.011 kg/m(3) density) in ST-1 zone and the withdrawal of light flocs (