Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai, 400 019, India.
Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai, 400 019, India.
J Environ Manage. 2024 Jan 15;350:119642. doi: 10.1016/j.jenvman.2023.119642. Epub 2023 Nov 27.
The complexity of wastewater matrix poses a challenge for conventional processes especially due to the presence of refractory compounds such as dyes. The present work focuses on utilizing ultrasound-induced cavitation in conjunction with different oxidants such as hydrogen peroxide, Fenton's reagent and potassium persulfate to treat Procion Brilliant Purple H-3R dye containing wastewater. The impact of various operating parameters as pH, frequency, and power on degradation levels has been studied with the aim of optimizing degradation. The optimal conditions for the degradation of Procion Brilliant Purple H-3R were determined as pH of 12, frequency of 22 kHz, and power of 250 W, resulting in a maximum degradation of 70.25%. Combination of a cavitation reactor with hydrogen peroxide, Fenton reagent, and KPS was then applied at optimized conditions, which confirmed a notable enhancement in degradation compared to the only ultrasound based process. Specifically, the degradation extent was 95.99% for combination with HO at 0.5 g/L loading, 99.79% for combination with Fenton at HO/Fe ratio of 50:1, and 99.05% for combination with KPS at loading of 0.75 g/L. The kinetic rate constant for the combined approach of US + Fenton was also maximum at 7.47 × 10 L mg min. Toxicity analysis was conducted on two bacterial strains, Escherichia coli and Staphylococcus aureus, using the wastewater in native form and after treatment. The various processes were evaluated in terms of the cavitational yield and overall treatment cost and it was determined that US + Fenton process is the most efficient treatment method for fully degrading Procion Brilliant Purple H-3R, particularly at larger scales of operation and cost efficiently as demonstrated in the work.
废水基质的复杂性给常规工艺带来了挑战，尤其是由于存在难处理的化合物，如染料。本工作重点利用超声空化结合不同氧化剂，如过氧化氢、芬顿试剂和过硫酸钾，处理含 Procion Brilliant Purple H-3R 染料的废水。研究了各种操作参数（如 pH 值、频率和功率）对降解水平的影响，旨在优化降解条件。确定了降解 Procion Brilliant Purple H-3R 的最佳条件为 pH 值 12、频率 22 kHz 和功率 250 W，最大降解率为 70.25%。然后将空化反应器与过氧化氢、芬顿试剂和过硫酸钾组合，在优化条件下应用，与仅基于超声的工艺相比，证实了降解的显著增强。具体而言，HO 负载量为 0.5 g/L 时与 HO 的组合降解程度为 95.99%，HO/Fe 比为 50:1 时与 Fenton 的组合降解程度为 99.79%，负载量为 0.75 g/L 时与 KPS 的组合降解程度为 99.05%。US+Fenton 联合方法的动力学速率常数也最大，为 7.47×10 L mg min。使用原废水和处理后的废水对两种细菌菌株大肠杆菌和金黄色葡萄球菌进行了毒性分析。根据空化产率和总处理成本对各种工艺进行了评估，结果表明 US+Fenton 工艺是完全降解 Procion Brilliant Purple H-3R 的最有效处理方法，特别是在较大的操作规模和成本效益方面，这在本工作中得到了证明。
