ABSTRACT In this study, the ozonolysis of real anaerobically digested distillery wastewater (DWW) was carried out. The effect of operating parameters, such as pH, initial concentration, and ozone dosage, on the efficiency of ozone utilization, color removal, and sludge solubilization was studied. The highest ozone utilization of 99% was observed at the highest initial concentration (COD of 3000 mg/L) and lowest ozone flowrate (22.5 mg O3/L/min), but with a very low color reduction of 20%, after 60 minutes of ozonolysis. To achieve a higher color reduction >80% and at ozone utilization >95%, the DWW had to be diluted twice (COD 1500 mg/L), and the flowrate doubled to 45 mg O3/L/min. The reduction in color signified the oxidation of the color causing biorecalcitrant aromatic melanoidin compounds. This was confirmed by the 47% reduction in ultraviolet absorbance at 254 nm indicating the breakdown of the complex aromatic compounds into low molecular weight organics. Moreover, increases in average oxidation state from −0.6 to −0.2 suggested a decline in aromaticity and formation of easily biodegradable aliphatic compounds. The ozonolysis process was found to follow the first-order reaction kinetic model with the highest rate constant of 0.0326 min−1 obtained. A reduction in suspended COD by 88% indicated solubilization of the sludge contained in the effluent.

中文翻译：

---

厌氧消化酒厂废水的臭氧分解后处理

摘要 在这项研究中，进行了真正的厌氧消化蒸馏废水 (DWW) 的臭氧分解。研究了操作参数（如 pH 值、初始浓度和臭氧剂量）对臭氧利用效率、颜色去除和污泥溶解效率的影响。在最高初始浓度（COD 为 3000 mg/L）和最低臭氧流速（22.5 mg O3/L/min）下观察到最高的臭氧利用率为 99%，但在 60 分钟后颜色减少非常低，为 20%臭氧分解。为了实现更高的颜色减少 > 80% 和臭氧利用率 > 95%，必须将 DWW 稀释两次（COD 1500 mg/L），并将流速加倍至 45 mg O3/L/min。颜色的减少意味着颜色的氧化导致生物顽固的芳香族类黑素化合物。254 nm 处的紫外吸收降低 47% 证实了这一点，这表明复杂的芳香族化合物分解为低分子量有机物。此外，平均氧化态从 -0.6 增加到 -0.2 表明芳香性下降并形成易于生物降解的脂肪族化合物。发现臭氧分解过程遵循一级反应动力学模型，获得的最高速率常数为 0.0326 min-1。悬浮 COD 减少 88% 表明污水中的污泥溶解。发现臭氧分解过程遵循一级反应动力学模型，获得的最高速率常数为 0.0326 min-1。悬浮 COD 减少 88% 表明污水中的污泥溶解。发现臭氧分解过程遵循一级反应动力学模型，获得的最高速率常数为 0.0326 min-1。悬浮 COD 减少 88% 表明污水中的污泥溶解。