IF 8.7 1区 化学 Q1 ACOUSTICS
Sabina Kolbl Repinc , Gašper Rak , Blaž Stres , Uroš Novak , Blaž Likozar , Anže Prašnikar , Marko Blagojevič , Benjamin Bizjan
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引用次数: 0

摘要

本研究探讨了一种新型污泥预处理装置的流体力学性能,该装置基于液压锤机制产生的周期性冲击波。旋转叶片反复撞击正在下降的圆形浓缩废活性污泥,从而在撞击附近的液体区域产生水力冲击波。处理 10 升废弃活性污泥的旋转水力冲击发生器(RGHS)在两种不同的转速下运行了 30 次,叶片冲击速度分别为 44 米/秒和 70 米/秒。在 70 米/秒的冲击速度和 30 次处理过程中,与未处理的样品相比,该设备的分解度 (DD) 达到 41.3%,释放的比能量消耗 (SEC) 为 10.4 千瓦时/千克 sCOD,产生的甲烷量提高了 9.0%。44 米/秒冲击速率下的相应值为:DD = 18.7%,SEC = 8.03 kWh/kg sCOD 释放量,甲烷产量提高 33.1%。在这两种预处理机制中,污泥的剪切粘度降低了约 60%,而理化分析、傅立叶变换红外光谱显示,WAS 的结构发生了重大变化,即中值粒径减小、蛋白质和多糖降解以及微生物细胞壁受损,这在扫描电镜图像上也很明显。与其他旋转设备相比,新型 RGHS 可以实现相对较高的污泥分解度,同时在污泥溶解和提高甲烷产量方面的能耗明显降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Pretreatment of waste activated sludge by rotational generator of hydraulic shock

Pretreatment of waste activated sludge by rotational generator of hydraulic shock
This study investigates hydrodynamic performance of a novel sludge pretreatment device based on periodic shock wave generation by a hydraulic hammer mechanism. A falling circular jet of thickened waste activated sludge was repeatedly impacted by a rotating blade, resulting in occurrence of hydraulic shock waves within the liquid region adjacent to the impact. The rotational generator of hydraulic shock (RGHS) treating 10 L of waste activated sludge was operated for 30 liquid passes and at two different rotational speeds producing blade impact velocities of 44 m/s and 70 m/s, respectively. At 70 m/s impact velocity and 30 passes, the device was able to achieve 41.3 % disintegration degree (DD), specific energy consumption (SEC) of 10.4 kWh/kg sCOD released and 9.0 % improvement of produced methane volume over unprocessed sample. Corresponding values for 44 m/s impact regime were DD = 18.7 %, SEC = 8.03 kWh/kg sCOD released and 33.1 % improvement in methane production. In both pretreatment regimes, sludge shear-dependent viscosity was reduced by about 60 %, while physicochemical analysis, FTIR spectra revealed substantial structural changes in WAS, namely median particle size reduction, degradation of proteins and polysaccharides, and microbial cell wall damage, what was notable also on SEM images. Compared to other rotary devices, the novel RGHS can achieve relatively high degree of sludge disintegration while consuming significantly less energy for sludge solubilization, and for methane production enhancement.
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来源期刊
Ultrasonics Sonochemistry
Ultrasonics Sonochemistry 化学-化学综合
CiteScore
15.80
自引率
11.90%
发文量
361
审稿时长
59 days
期刊介绍: Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels. Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.
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