National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China; Beijing Drainage Group Co., Ltd., Beijing 100044, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
Bioresour Technol. 2024 Dec;414:131618. doi: 10.1016/j.biortech.2024.131618. Epub 2024 Oct 11.
Conditions conducive to aerobic granular sludge (AGS) growth and maintenance are very difficult to realize in continuous-flow biological treatment processes. This study conducted a continuous-flow self-circulating up-flow granular sludge fluidized bed (Zier process) treating real urban wastewater approximately one year. The substantial self-circulating multiple times (R, 8-15 times) and up-flow velocity (8-15 m/h) generated by aeration, the only power equipment in Zier process, facilitated pollutant removal, particle granulation and stabilization. With hydraulic retention time of 5 h, R of 9.3-14.4 times and chemical oxygen demand (COD)/total nitrogen (TN) ratio of 5.9 ± 1.0, the effluent COD, ammonia nitrogen and TN were 28.6 ± 7.7, 1.1 ± 1.2, and 13.3 ± 1.7 mg/L, respectively. The median particle size was 150-250 μm and effluent suspended solids concentration was 33.4 ± 14.5 mg/L. It is unnecessary to set up sludge reflux which simplifies the subsequent mud-water separation facilities. The Zier process provides a new process structure for implementation of continuous-flow AGS process.
有利于好氧颗粒污泥（AGS）生长和维持的条件在连续流生物处理工艺中很难实现。本研究在连续流自循环上流颗粒污泥流化床（Zier 工艺）中处理实际城市污水约一年。曝气产生的大量自循环多次（R，8-15 次）和上流速度（8-15 m/h），是 Zier 工艺中唯一的动力设备，有利于污染物去除、颗粒化和稳定化。水力停留时间为 5 h，R 为 9.3-14.4 倍，COD/总氮（TN）比为 5.9±1.0，出水 COD、氨氮和 TN 分别为 28.6±7.7、1.1±1.2 和 13.3±1.7 mg/L，中值粒径为 150-250 μm，出水悬浮物浓度为 33.4±14.5 mg/L。无需设置污泥回流，简化了后续的泥水分离设施。Zier 工艺为实施连续流 AGS 工艺提供了一种新的工艺结构。
