An Zhaohui, Wang Jiefu, Zhang Xueyao, Bott Charles B, Angelotti Bob, Brooks Matt, Wang Zhi-Wu
Department of Biological Systems Engineering, Virginia Tech, 1230 Washington St. SW, Blacksburg, VA 24061, USA.
Hampton Roads Sanitation District, 1434 Air Rail Avenue, Virginia Beach, VA 23455, USA.
Water Res X. 2023 Jun 1;19:100186. doi: 10.1016/j.wroa.2023.100186. eCollection 2023 May 1.
This study removes two technical constraints for transitioning full-scale activated sludge infrastructure to continuous flow, aerobic granular sludge (AGS) facilities. The first of these is the loss of treatment capacity as a result of the rapid washout of flocculent sludge inventory and in turn the potential loss of nitrification during initial AGS reactor startup. The second is the physical selector design which currently is limited to either the complex sequencing batch reactor selection or sidestream hydrocyclones. Briefly, real wastewater data collected from this study suggested that by increasing the surface overflow rate (SOR) of an upflow clarifier to 10 m h , the clarifier can be taken advantage of as a physical selector to separate flocculant sludge from AGS. Redirecting the physical selector underflow and overflow sludge to the feast and famine zones of a treatment train, respectively, can create a biological selection that not only promotes AGS formation but also safeguards the effluent quality throughout the AGS reactor startup period. This study provides a novel concept for economically implementing continuous flow AGS within existing full-scale, continuous flow treatment trains.
本研究消除了将全规模活性污泥基础设施转变为连续流好氧颗粒污泥（AGS）设施的两个技术限制。其中第一个限制是由于絮状污泥存量的快速冲刷导致处理能力丧失，进而在AGS反应器初始启动期间可能丧失硝化作用。第二个限制是物理选择器设计，目前仅限于复杂的序批式反应器选择或侧流水力旋流器。简而言之，从本研究中收集的实际废水数据表明，通过将上流式澄清器的表面溢流率（SOR）提高到10 m/h，该澄清器可作为物理选择器，用于从AGS中分离絮状污泥。将物理选择器的底流和溢流污泥分别重定向到处理流程的 feast 和 famine 区，可以创造一种生物选择，不仅能促进AGS的形成，还能在AGS反应器启动期间保障出水水质。本研究为在现有的全规模连续流处理流程中经济地实施连续流AGS提供了一个新颖的概念。
