National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China; Sichuan Engineering Laboratory of Resource Utilization of Mine Tailings, Sichuan University of Science & Engineering, Sichuan, 643000, PR China; School of Space and Environment, Beijing University of Aeronautics and Astronautics, Beijing, 100191, PR China.
National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, PR China.
Water Res. 2018 Sep 15;141:135-144. doi: 10.1016/j.watres.2018.05.010. Epub 2018 May 9.
The long-term performance of an anoxic-oxic-hydrocyclone (AOH) process with an in-situ hydrocyclone treatment unit in the mixed liquid return line for sludge reduction and carbon reuse has been observed, in comparison with a conventional anoxic-oxic (AO) process. Three parallel side-stream systems, including one AOH system with a 25-mm hydrocyclone, one AOH system with a 35-mm hydrocyclone and one AO system, were built and fed with real wastewater for a comparative study in a wastewater treatment plant. The results demonstrate that the hydrocyclone in the AOH process was able to break macro-flocs into smaller flocs. And the desorption of the extracellular polymeric substance from return activated sludge (AS) leaded to an average increase of 62.97% and 36.36% in SCOD in the AOH and AOH system, respectively. In addition, shear forces, centrifugal forces of revolution and flocs' rotation in the hydrocyclone were proposed to be the main influence mechanism of hydrocyclone treatment on AS properties. Compared with the AO process, the SCOD concentration in the effluent of the AOH processes presented a decrease of 12.0 mg/L and the TN was reduced by 21.50% owing to the released carbon sources reuse. Moreover, the sludge production was reduced by 36.81% and 35.92% in the AOH and AOH process, respectively. By contrast, the AOH system was better than the AOH system.
采用内循环水力旋流器的缺氧-好氧-水力旋流（AOH）工艺与传统的缺氧-好氧（AO）工艺相比，其在混合液回流管中用于污泥减量和碳回收的长期性能已经得到了观察。构建了三个平行的侧流系统，包括一个带有 25mm 水力旋流器的 AOH 系统、一个带有 35mm 水力旋流器的 AOH 系统和一个 AO 系统，并用实际废水对其进行了比较研究。结果表明，AOH 工艺中的水力旋流器能够将大絮体破碎成较小的絮体。并且，回流活性污泥（AS）中细胞外聚合物的解吸导致 AOH 和 AOH 系统中的 SCOD 分别平均增加了 62.97%和 36.36%。此外，提出水力旋流器对 AS 特性的主要影响机制为剪切力、旋转离心力和絮体的旋转。与 AO 工艺相比，AOH 工艺的出水 SCOD 浓度降低了 12.0mg/L，TN 减少了 21.50%，这是由于释放的碳源得以回收利用。此外，AOH 和 AOH 工艺的污泥产量分别减少了 36.81%和 35.92%。相比之下，AOH 系统优于 AOH 系统。
