Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany; Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
Bioresour Technol. 2022 Mar;348:126785. doi: 10.1016/j.biortech.2022.126785. Epub 2022 Jan 31.
The performance of ultrasonic treatment was assessed under different hydrostatic pressures for two different waste activated sludges. The impact of pressurized sonication was evaluated based on the degree of disintegration (DD) and the specific methane yield (SMY). An enhancement of DD was observed at an intermediate pressure level (max. 53% at 1.0 bar), but at higher pressure levels (up to 3.5 bar), the enhancement was not as pronounced as for the intermediate ranges (max. 11%). In contrast to DD, SMY increased with increasing pressure for both sludge samples tested (max 17% at 3.5 bar) so that SMY did not show a notable correlation with DD. A positive energy balance (max. 167%) considering the energy input for ultrasonication and the additional methane generated was only achieved in samples treated under elevated hydrostatic pressure. Since this can be achieved with negligible effort, the enhancement can be considered as "methane for free".
研究了两种不同的剩余活性污泥在不同静压下的超声处理效果。根据污泥解体程度（DD）和特定甲烷产量（SMY）评估加压超声的效果。在中等压力水平（在 1.0 巴时最大提高 53%）下观察到 DD 增强，但在更高的压力水平（最高 3.5 巴）下，增强程度不如中等范围明显（最大提高 11%）。与 DD 相反，两种测试污泥的 SMY 均随压力的增加而增加（在 3.5 巴时最高提高 17%），因此 SMY 与 DD 之间没有明显的相关性。考虑到超声处理的能量输入和额外产生的甲烷，在高压下处理的样品中仅实现了正的能量平衡（最高为 167%）。由于可以用微不足道的努力实现这一点，因此可以将这种增强视为“免费的甲烷”。
