Due to the high moisture, strong hydrophilicity, and hard compressibility of sewage sludge (SS), it is difficult to realize the high-efficiency drying. Herein, a novel SS drying technology was developed to quickly and deeply reduce the moisture of SS from 75.6% to 38.5% in 1 h. During the process, secondary aluminum ash (SAA), a solid waste, was added to SS and acted as skeletons to form plenty of channels. Subsequently, NaOH was added and reacted with SAA to produce a lot of heat, resulting in a rapid temperature rise of the system from 20 to 105°C in 60 s. The heat could effectively remove water from these channels, which could be proved by the T1-T2 maps of in-site Low-Field 1H nuclear magnetic resonance. In addition, the extracellular polymeric substances were decomposed by SAA/NaOH successfully, and thus the SS became hydrophobic, favoring the drying. Finally, the dried SS could be used to fabricate unburned bricks. Thus, this work provides a promising method to realize the rapid SS deep drying and high-efficiency utilization of SAA and dried SS.

中文翻译：

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一石三鸟：使用再生铝灰在 1 小时内将污水污泥深干化以制造砖块


由于污水污泥（SS）水分高、亲水性强、难压缩，难以实现高效干化。在此，开发了一种新颖的 SS 干燥技术，可在 1 小时内快速、深入地将 SS 的水分从 75.6% 降低到 38.5%。在此过程中，再生铝灰 （SAA）（一种固体废物）被添加到 SS 中，并充当骨架以形成大量通道。随后，加入 NaOH 并与 SAA 反应产生大量热量，导致系统在 60 s 内从 20°C 快速升温到 105°C。热量可以有效地去除这些通道中的水，这可以通过现场低场 1H 核磁共振的 T1-T2 图来证明。此外，胞外聚合物物质被 SAA/NaOH 成功分解，因此 SS 变得疏水，有利于干燥。最后，干燥的 SS 可用于制造未燃烧的砖。因此，这项工作为实现 SAA 和干燥 SS 的快速 SS 深度干燥和高效利用提供了一种有前途的方法。