Institute of Environmental Engineering, Polish Academy of Sciences, 34 M. Skłodowskiej-Curie St., 41-819 Zabrze, Poland.
Int J Environ Res Public Health. 2018 Oct 20;15(10):2311. doi: 10.3390/ijerph15102311.
A comprehensive analysis of the effects obtained in the process of ultrasonic disintegration (UD) of waste activated sludge (WAS), was conducted. Sludge samples were collected periodically from Central Wastewater Treatment Plant (WWTP) in Gliwice (Poland) and disintegrated in the two ultrasonic devices of different construction and technical parameters, i.e., WK-2010 (A) and ultrasonic washer (B). The experiments were performed under a constant energy supply per sludge volume E = 160 kWh·m. The direct and technological effects, i.e., after UD and anaerobic digestion (AD) were investigated, respectively. Statistical analysis showed that characteristics and parameters of the WAS, which affects the magnitude of the direct effects create the following sequence: TS (total solids), VS (volatile solids), ΔT (temperature increase) > EPS (extracellular polymeric substances) > SCOD (soluble chemical oxygen demand) > CST (capillary suction time) > Ntotal nitrogen), P (total phosphorus) > pH. Whereas, in the case of technological effects, the above sequence was as follows: TS, VS > CST > N, P > pH. Ultrasonic disintegration of WAS prior to AD increased total biogas production (from 13.0% to 19.7%) and reduced the content of TS (from 4.1% to 8.2%) and VS (5.8% to 9.5%) in comparison to the control sample. This confirms the usefulness of ultrasonic disintegration as an effective method of sludge digestion intensification. The obtained results showed that changes in the characteristics of WAS have a significant impact on the magnitude of the effects of ultrasonic disintegration, especially TS, VS, ΔT, EPS, SCOD and CST. Concluding, it can be inferred that the most promising conditions for ultrasonic pretreatment conducted under constant energy supply per sludge volume, are: low power, long sonication time, large surface area of the emitter, and high increase of sludge temperature while conducting the process.
对超声破碎（UD）过程中获得的效果进行了全面分析。定期从格利维采（波兰）中央污水处理厂（WWTP）收集污泥样品，并在两种结构和技术参数不同的超声设备中进行破碎，即 WK-2010（A）和超声清洗机（B）。实验在每体积污泥的恒定能量供应 E = 160 kWh·m 下进行。分别研究了直接和技术效果，即在 UD 和厌氧消化（AD）之后。统计分析表明，影响直接效果大小的 WAS 特性和参数创建了以下序列：TS（总固体）、VS（挥发性固体）、ΔT（温度升高）>EPS（胞外聚合物物质）>SCOD（可溶性化学需氧量）>CST（毛细抽吸时间）>Ntotal 氮）、P（总磷）>pH。然而，在技术效果方面，上述顺序如下：TS、VS>CST>N、P>pH。与对照样品相比，AD 前的 WAS 超声破碎增加了总沼气产量（从 13.0%增加到 19.7%），并降低了 TS（从 4.1%减少到 8.2%）和 VS（从 5.8%减少到 9.5%）的含量。这证实了超声破碎作为一种有效的污泥消化强化方法的有用性。获得的结果表明，WAS 特性的变化对超声破碎效果的大小有重大影响，尤其是 TS、VS、ΔT、EPS、SCOD 和 CST。可以推断，在每体积污泥的恒定能量供应下进行超声预处理的最有前途的条件是：低功率、长超声时间、发射器的大表面积以及在处理过程中污泥温度的大幅升高。
Zotero 插件