Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
Ultrason Sonochem. 2023 Aug;98:106524. doi: 10.1016/j.ultsonch.2023.106524. Epub 2023 Jul 10.
The current work investigates the efficacy of acoustic cavitation (AC) based pretreatment as a process intensification method for improving the conventional biological oxidation (BO) treatment of the effluent from common effluent treatment plant (CETP) mainly containing pharmaceutical compounds. The effluent acclimatized with cow dung-based sludge was utilized for the aerobic oxidation with an optimum condition of 1:3 ratio of sludge to effluent and 6 h as duration. COD reduction of 19.58% was achieved with the conventional biological oxidation, which was demonstrated to be improved by incorporating acoustic cavitation-based pretreatment approaches under optimized conditions of 125 W and 70% duty cycle for only AC as well as oxidant loadings as 1000 mg/L for HO, 250 mg/L Fe(II) with 1000 mg/L HO for Fenton, 1000 mg/L for KPS and 0.5 L/min for the O during the combination approaches. The improved COD reduction after the use of pretreatment approaches followed by the BO of 6 h duration was 29.26%, 72.42%, 85.47%, 45.68% and 69.26% for the AC, AC + HO, AC + Fenton, AC + KPS and AC + O based approaches respectively. The toxicity assay of the effluent before and after every pretreatment approach using bacterial strains ofStaphylococcus aureusandPseudomonas aeruginosaensured the biodegradability of the treated effluent as no toxic intermediates could be seen. Overall, the present work elucidated the effectiveness of acoustic cavitation-based pretreatment approaches for the improvement of conventional BO of CETP effluent.
目前的工作研究了声空化（AC）预处理作为一种强化过程的方法的效果，以改善主要含有药物化合物的常规污水处理厂（CETP）流出物的常规生物氧化（BO）处理。利用牛粪基污泥使流出物适应好氧氧化，最佳条件为污泥与流出物的比例为 1:3，持续时间为 6 小时。常规生物氧化可实现 19.58%的 COD 减少，通过在 125 W 和 70%占空比的优化条件下结合声空化预处理方法，以及仅 AC 的氧化剂负荷为 1000 mg/L 的 HO、250 mg/L Fe(II)与 1000 mg/L HO 的 Fenton、1000 mg/L KPS 和 0.5 L/min 的 O，证明该方法可改善 COD 减少。预处理方法结合 6 小时 BO 后，COD 减少率分别为 AC、AC+HO、AC+Fenton、AC+KPS 和 AC+O 方法的 29.26%、72.42%、85.47%、45.68%和 69.26%。使用金黄色葡萄球菌和铜绿假单胞菌的细菌菌株对预处理前后的废水进行毒性检测，确保了处理后废水的可生物降解性，因为没有看到有毒中间体。总的来说，本工作阐明了声空化预处理方法对改善 CETP 流出物常规 BO 的有效性。
