Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
Department of Civil and Environmental Engineering, University of Delaware, Newark, USA.
Environ Pollut. 2021 Oct 1;286:117245. doi: 10.1016/j.envpol.2021.117245. Epub 2021 Apr 28.
Hydrodynamic cavitation (HC) coupled with persulfate (PS)-based that resulted in the synergistic degradation of polycyclic aromatic hydrocarbons (PAHs) in contaminated marine sediments. The effects of HC injection pressure and Σ[PAH]: [PS] on the rate and extent of PAH degradation were studied in the pressure range of 0.5-2.0 bar, PS concentration rage of 2 × 10 to 2 × 10 M or Σ[PAH]: [PS] of 1:10-1000, and reaction time of 20-60 min. A pseudo-first-order rate law fitted PAHs removal kinetics well. The degradation rate constant increased with injection pressure, reaching the maximum level at 0.5 bar, then decreased at injection pressure became greater than 0.5 bar. The results showed that PAH removal was 84% by the combined HC and PS process, whereas, HC alone only achieved a 43% removal of PAHs in marine sediments under the optimal inlet pressure of 0.5 bar at PS concentration of 2 × 10 M in 60 min. The HC‒PS system effectively removed PH, PY, FLU, BaA, and CH at 91, 99, 91, 84, and 90%, respectively. The maximum removal of 6-, 5-, 4-, 3-, and 2-ring PAHs was 89, 87, 84, 76, and 34%, respectively. Major reactive oxygen species (ROSs), namely, SO and HO•, were responsible for PAHs degradation. Results clearly highlighted the feasibility of HC-PS system for the clean-up of PAHs-laden sediments in particular and other recalcitrant organic contaminants in general.
水力空化（HC）与过硫酸盐（PS）结合，协同降解污染海洋沉积物中的多环芳烃（PAHs）。研究了在 0.5-2.0 巴的压力范围内、2×10 至 2×10 M 的 PS 浓度范围或 1:10-1000 的Σ[PAH]：[PS]以及 20-60 分钟的反应时间内，HC 注射压力和Σ[PAH]：[PS]对 PAH 降解速率和程度的影响。准一级反应动力学很好地拟合了 PAHs 的去除动力学。降解速率常数随注射压力的增加而增加，在 0.5 巴时达到最大值，然后在注射压力大于 0.5 巴时降低。结果表明，在 PS 浓度为 2×10 M、最佳入口压力为 0.5 巴、反应时间为 60 分钟的条件下，联合 HC 和 PS 工艺可去除 84%的 PAHs，而单独 HC 工艺在相同条件下仅可去除 43%的 PAHs。HC-PS 系统有效地去除了 PH、PY、FLU、BaA 和 CH，去除率分别为 91%、99%、91%、84%和 90%。6-、5-、4-、3-和 2-环 PAHs 的最大去除率分别为 89%、87%、84%、76%和 34%。主要的活性氧物质（ROSs），即 SO 和 HO•，负责 PAHs 的降解。结果清楚地强调了 HC-PS 系统用于特别清除 PAHs 污染沉积物和一般难降解有机污染物的可行性。
