Department of Civil, Constructional and Environmental Engineering, Faculty of Civil and Industrial Engineering, Sapienza University of Rome, Via Eudossiana, 18, 00184, Rome, Italy.
Environ Sci Pollut Res Int. 2019 Dec;26(35):35957-35967. doi: 10.1007/s11356-019-06684-9. Epub 2019 Nov 10.
The present study investigated the effects of ozonation pre-treatment at low-ozone dosage (below 100 mgO/gTS) with respect to previous studies, on the anaerobic digestion of waste-activated sludge alone and a mixture of activated sludge and primary sludge. Methane production and volatile suspended solids reduction efficiency were determined for different specific ozone dosages and compared with the values obtained in the absence of pre-treatment. Among the dosages tested in the study (from 4.8 to 73.2 mgO/gTS for mixed sludge and from 3.5 to 53.6 mgO/gTS for waste-activated sludge), the best results were obtained at the lowest ones: 4.8 and 3.5 mgO/gTS for mixed sludge and waste-activated sludge, respectively. Indeed, at this dosage, an additional methane production of about 6% and 30% was achieved for mixed and waste-activated sludge, respectively; furthermore, the maximum CH production rate increased of about 21% and 33% for mixed and waste-activated sludge, respectively. With respect to the Gompertz model, the modified logistic model provided the best agreement to the experimental data of the specific methane yield production. The present study demonstrated the importance of investigating the application of low dosages when ozonation is being evaluated as a pre-treatment to enhance anaerobic digestion performance.
本研究调查了在低于 100mgO/gTS 的低臭氧剂量下进行臭氧预处理对先前研究的影响，分别考察了其对单独的废水活性污泥和活性污泥与初沉污泥混合物的厌氧消化的影响。针对不同的特定臭氧剂量，确定了甲烷生成量和挥发性悬浮固体去除效率，并将其与未进行预处理时的结果进行了比较。在研究中测试的剂量（混合污泥的 4.8 至 73.2mgO/gTS 和废水活性污泥的 3.5 至 53.6mgO/gTS）中，最佳结果出现在最低剂量下：分别为混合污泥和废水活性污泥的 4.8 和 3.5mgO/gTS。实际上，在该剂量下，混合污泥和废水活性污泥的甲烷生成量分别增加了约 6%和 30%；此外，混合污泥和废水活性污泥的最大 CH 生成速率分别增加了约 21%和 33%。就特定甲烷产率的生产而言，与实验数据相比，修正的 logistic 模型比 Gompertz 模型提供了更好的拟合度。本研究表明，在评估臭氧预处理作为提高厌氧消化性能的方法时，研究低剂量的应用非常重要。
