Clean Water Technology Lab (CLEWATEC), Institute of Fluid Dynamics, Helmholtz Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany.
AIR LIQUIDE Forschung und Entwicklung GmbH, Gwinnerstraße 27-33, 60388, Frankfurt, Germany.
J Environ Manage. 2024 Nov;370:122795. doi: 10.1016/j.jenvman.2024.122795. Epub 2024 Oct 9.
Micropollutants (MPs) encompass a range of human-made pollutants present in trace amounts in environmental systems. MPs include pharmaceuticals, personal care products, pesticides, persistent organic pollutants, micro- and nano-plastics, and artificial sweeteners, all posing ecological risks. Conventional municipal wastewater treatment methods often face challenges in completely removing MPs due to their chemical characteristics, stability, and resistance to biodegradation. In this research, an Advanced Oxidation Process, combining hydrodynamic cavitation (HC) with dissolved ozone (O) and side injection, was employed to efficiently degrade succinic acid (SA), an ozone-resistant compound and common byproduct. The HC/O process was run to treat different synthetic effluents, focusing on evaluating the influence of O-to-total organic carbon (TOC) ratio, cavitation number (C) and O dosage. Notably, the results from a series of 14 experiments highlighted the critical significance of a low O-to-TOC ratio value of 0.08 mg/mg and C value of 0.056 in HC for achieving efficient SA removal of 41.2% from an initial SA solution (106.3 mg/L). Regarding a series of four proof-of-concept experiments and their replications, the average TOC removal reached 62% when treating wastewater treatment plant effluent spiked with SA. This significant removal rate was achieved under initial conditions: C of 0.02, O-to-TOC ratio set at 0.77 mg/mg, TOC concentration of 47.7 mg/L, 106 mg/L of SA, and a temperature of 25 °C. Notably, the electrical energy per order required for the 62% reduction in TOC was a modest 12.5 kWh/m/order, indicating the potential of the continuous HC/O process as a promising approach for degrading a wide range of MPs.
微污染物（MPs）包括痕量存在于环境系统中的一系列人为污染物。 MPs 包括药物、个人护理产品、农药、持久性有机污染物、微纳米塑料和人工甜味剂，所有这些都构成了生态风险。由于其化学特性、稳定性和抗生物降解性，传统的城市废水处理方法往往难以完全去除 MPs。在这项研究中，采用了一种高级氧化工艺，将空化（HC）与溶解臭氧（O）和侧注相结合，有效地降解了琥珀酸（SA），这是一种对臭氧有抗性的化合物和常见的副产物。 HC/O 工艺用于处理不同的合成废水，重点评估 O 与总有机碳（TOC）比、空化数（C）和 O 剂量的影响。值得注意的是，一系列 14 个实验的结果强调了在 HC 中 O 与 TOC 比为 0.08mg/mg 和 C 值为 0.056 的低值的重要性，这对于从初始 SA 溶液（106.3mg/L）中实现 41.2%的高效 SA 去除至关重要。关于一系列四个概念验证实验及其重复实验，当处理含有 SA 的污水处理厂废水时，平均 TOC 去除率达到 62%。在初始条件下，当处理含有 SA 的污水处理厂废水时，可实现这种显著的去除率：C 值为 0.02，O 与 TOC 比设定为 0.77mg/mg，TOC 浓度为 47.7mg/L，SA 浓度为 106mg/L，温度为 25°C。值得注意的是，TOC 减少 62%所需的每阶电能为 12.5kWh/m/order，这表明连续 HC/O 工艺作为降解各种 MPs 的有前途方法具有潜力。
