Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany; BANDELIN electronic GmbH & Co., KG Heinrichstraße 3-4, 12207 Berlin, Germany.
Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
Ultrason Sonochem. 2020 Jun;64:105001. doi: 10.1016/j.ultsonch.2020.105001. Epub 2020 Feb 4.
The effectiveness of tube and sonotrode reactors for the sonication of sewage sludge under identical conditions was compared for the first time. Despite the considerable structural differences, sonication with each ultrasonic reactor led to an accelerated degradation rate and an increased methane production within the first five days for the majority of the sewage sludge samples tested. On closer examination, however, it becomes clear that the investigated sonication systems are not equally suitable for the substrates considered. While the use of a sonotrode proved to be particularly advantageous for the treatment of waste activated sludge (+25% methane yield at 300 kJ/kg), the use of a 2-inch tube reactor achieved the highest enhancement for low-intensity sonication in digested sludge (+22% methane yield at 300 kJ/kg). With increasing energy input, more chemical oxygen demand was solubilized, but this did not result in an increase in methane yield for all samples. Sonication of waste activated sludge led to a significant reduction in viscosity of up to 50%, and a reduction of up to 60% was observed after sonication of digested sludge with low energy inputs. The study, therefore, demonstrates that the choice of the most suitable sonication system essentially depends on the properties of the sludge to be sonicated.
首次比较了在相同条件下，管式和超声探头式反应器在超声处理污水污泥方面的效果。尽管结构存在较大差异，但对于大多数测试的污水污泥样品，每种超声反应器的超声处理都导致在前五天内加速了降解速度和增加了甲烷产量。然而，进一步研究表明，所研究的超声处理系统对于所考虑的底物并不完全适用。虽然使用超声探头处理废水活性污泥特别有利（在 300kJ/kg 时甲烷产量增加了+25%），但在低强度超声处理消化污泥时，使用 2 英寸管式反应器可实现最高的增强效果（在 300kJ/kg 时甲烷产量增加了+22%）。随着能量输入的增加，更多的化学需氧量被溶解，但并非所有样品的甲烷产量都因此增加。超声处理废水活性污泥可使粘度降低高达 50%，而低能量输入超声处理消化污泥后，粘度降低高达 60%。因此，该研究表明，选择最合适的超声处理系统主要取决于待处理污泥的特性。
