在一个大型污水处理厂中运行 10 年的微孔扩散器的污染特性和曝气性能恢复。
Fouling characterization and aeration performance recovery of fine-pore diffusers operated for 10 years in a full-scale wastewater treatment plant.
机构信息
Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
Shanghai Engineering Research Center of Energy - Saving in Heat Exchange Systems, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
出版信息
Bioresour Technol. 2020 Jul;307:123197. doi: 10.1016/j.biortech.2020.123197. Epub 2020 Mar 17.
Fouling characterization and aeration performance recovery of fine-pore diffusers operated for 10 years in a full-scale wastewater treatment plant were investigated to elucidate fouling mechanisms and develop cleaning strategy. The performance decline of diffusers was observed with dynamic wet pressure increased by 3.2 times and standard oxygen transfer efficiency dropped to 73%, which contributed to 15.0% increase in total energy consumption. Oxygen-affinity, filamentous and extracellular polymeric substances secreting bacteria tended to accumulate on the diffuser surface. External (mainly biofilm growth), internal (organic and inorganic matters) and irrecoverable (mainly material aging) foulants accounted for 34.1%, 45.4% and 20.1% of total fouling, respectively. HCl cleaning failed to restore aeration efficiency because it eliminated structural support formed by inorganics, leaving organic foulants broken into smaller fragments and distributed more dispersed. NaClO showed better cleaning efficiency by effectively removing organic foulants. Sequential cleaning by NaClO and HCl, which achieved the best recovery, was recommended.
为了阐明结垢机理并制定清洗策略，对运行 10 年的全尺寸污水处理厂中的微孔扩散器进行了结垢特性和曝气性能恢复研究。随着动态湿压增加了 3.2 倍，标准氧转移效率下降到 73%，观察到扩散器的性能下降，这导致总能耗增加了 15.0%。对氧气亲和力、丝状菌和分泌胞外聚合物的细菌容易在扩散器表面积聚。外部（主要是生物膜生长）、内部（有机和无机物质）和不可恢复的（主要是材料老化）污染物分别占总结垢的 34.1%、45.4%和 20.1%。HCl 清洗未能恢复曝气效率，因为它消除了由无机物形成的结构支撑，使有机污染物破碎成更小的碎片并分布得更加分散。NaClO 通过有效去除有机污染物表现出更好的清洗效率。推荐采用 NaClO 和 HCl 顺序清洗，以达到最佳的恢复效果。
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