Occoquan Laboratory, Department of Civil and Environmental Engineering, Virginia Tech, 9408 Prince William Street, Manassas, VA 20110, USA; Hazen and Sawyer, 4035 Ridge Top Road, Suite 500, Farfax, VA 22030, USA.
Upper Occoquan Service Authority, 14631 Compton Rd, Centreville, VA 20121, USA.
Sci Total Environ. 2021 Jan 1;750:141467. doi: 10.1016/j.scitotenv.2020.141467. Epub 2020 Aug 5.
Plug flow reactors (PFRs) made of multiple completely stirred tank reactors (CSTRs) in series were used to cultivate aerobic granules in real domestic wastewater. Theoretically, changing the number of CSTR chambers in series will change the nature of plug flow, and thus alter the pattern of the feast/famine condition and impact the aerobic granulation progress. Therefore, PFRs were operated in 4-, 6-, and 8-chamber mode under the same gravity selection pressure (a critical settling velocity of 9.75 m h) and hydraulic retention time (6.5 h) until steady states were reached to evaluate the effect of the feast/famine condition on continuous flow aerobic granulation. The sludge particle size, circularity, settleability, specific gravity, zone settling velocity, and extracellular polymeric substance contents were analyzed to evaluate the role that a feast/famine regime plays in aerobic granulation. It was found that aerobic granulation failed whenever the feast/famine ratio was greater than 0.5. The results support a conclusion that the feast/famine condition is likely a prerequisite for continuous flow aerobic granulation.
采用多套完全混合式反应器（CSTR）串联而成的推流式反应器（PFR）来处理实际生活污水中的好氧颗粒。理论上，改变串联 CSTR 室的数量将改变推流的性质，从而改变饥饿/饱食状态的模式，并影响好氧颗粒化的进展。因此，在相同的重力选择压力（临界沉降速度为 9.75 m h）和水力停留时间（6.5 h）下，以 4、6 和 8 室模式运行 PFR，直到达到稳定状态，以评估饥饿/饱食条件对连续流好氧颗粒化的影响。分析污泥粒径、圆度、沉降性、比重、区域沉降速度和胞外聚合物含量，以评估饥饿/饱食对好氧颗粒化的作用。结果发现，只要饥饿/饱食比大于 0.5，好氧颗粒化就会失败。结果表明，饥饿/饱食条件可能是连续流好氧颗粒化的前提条件。
