School of Environmental Science and Engineering, Pohang University of Science and Technology, Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea.
J Environ Manage. 2013 Nov 15;129:274-82. doi: 10.1016/j.jenvman.2013.07.009. Epub 2013 Aug 22.
Lab-scale High Efficiency Digestion (HED) systems containing a Mesophilic Anaerobic Reactor (MAR), Thermophilic Aerobic Reactor (TAR), liquid/solid separation unit, and thermal-alkaline treatment were developed to evaluate the efficiencies of sludge reduction and methane production. The HED process was divided into three phases to examine the influence of sludge pretreatment and pretreated sludge recirculation using TCOD and VSS reduction, COD solubilization, and methane production. The VSS removal with a solid/liquid separation unit, sludge recirculation, and thermal-alkaline treatment drastically increased up to 95% compared to the feed concentration. In addition, the results of COD solubilization and VSS/TSS showed that the solubilization of cells and organic matters by the thermal-alkaline treatment was highly increased, which was also consistent with the SEM images. In particular, the methane production rate increased 24-fold when the feed sludge and recirculated sludge were pretreated together. Collectively, the HED experiments performed with sludge recirculation and thermal-alkaline treatment demonstrated that the HED systems can be successfully employed for highly efficient sewage sludge reduction and methane gas production.
开发了实验室规模的高效消化（HED）系统，其中包含中温厌氧反应器（MAR）、高温好氧反应器（TAR）、液/固分离单元和热碱处理，以评估污泥减量和甲烷生成的效率。HED 工艺分为三个阶段，考察了污泥预处理和使用 TCOD 和 VSS 减少、COD 溶解和甲烷生成对预处理污泥再循环的影响。与进料浓度相比，使用固/液分离单元、污泥再循环和热碱处理可使 VSS 去除率大幅提高至 95%。此外，COD 溶解和 VSS/TSS 的结果表明，细胞和有机物的热碱处理溶解率大大提高，这也与 SEM 图像一致。特别是当进料污泥和循环污泥一起预处理时，甲烷生成速率增加了 24 倍。总的来说，带有污泥再循环和热碱处理的 HED 实验表明，HED 系统可成功用于高效污水污泥减量和甲烷气体生产。
