The generation of cavitation fields for the pre-treatment of anaerobic sludge was studied by means of a novel acoustic measuring system. The influence of different reactor dimensions (i.e., choosing reaction chamber widths of 40, 60 and 80 mm) on the cavitation intensity was determined at various solid contents, flow rates and static pressures. Results suggest that the cavitation intensity is significantly reduced by the sonication of liquids with a high solid content. By increasing the pressure to 1 bar, the intensity of bubble implosions can be enhanced and the sound attenuation in the solid fraction is partly compensated compared to ambient pressure. However, a further increase in pressure to 2 bars has a detrimental effect due to the suppression of powerful bubbles. A reduction of the reactor gap permits an intensification of the treatment of waste activated sludge (WAS) by concentrating the ultrasound power from 6 to 18 dB. This effect is less relevant in digested sludge (DS) with its markedly lower total solids content (2.2% vs. 6.9 % of solids in WAS). Increasing the flow rate, resulting in a flow velocity of up to 7 m/min, has no influence on the cavitation intensity. By adapting the reactor design and the static pressure to the substrate characteristics, the intensity of the sonication can be notably improved. This allows the design of sonication devices that are suitable for the intensive treatment of wastewater sludge.

利用新型声学测量系统研究了厌氧污泥预处理的空化场的产生。在各种固体含量，流速和静压力下，确定了不同反应器尺寸（即选择40、60和80 mm的反应室宽度）对空化强度的影响。结果表明，通过超声处理具有高固含量的液体，可以明显降低空化强度。通过将压力增加到1 bar，可以提高气泡内爆的强度，并且与环境压力相比，可以部分补偿固体部分中的声音衰减。然而，由于抑制了大气泡，将压力进一步增加至2巴具有有害作用。反应器间隙的减小允许将超声功率从6 dB集中到18 dB，从而加强了对废活性污泥（WAS）的处理。该效果在消化污泥（DS）中的相关性较低，因为其总固体含量显着降低（WAS中为2.2％，而固体含量为6.9％）。增加流速，导致流速最高为7 m / min，对空化强度没有影响。通过使反应器设计和静压适应基材特性，可以显着提高超声强度。这允许设计适合深度处理废水污泥的超声处理设备。WAS中固体含量为2％，而固体含量为6.9％）。增加流速，导致流速最高为7 m / min，对空化强度没有影响。通过使反应器设计和静压适应基材特性，可以显着提高超声强度。这允许设计适合深度处理废水污泥的超声处理设备。WAS中固体含量为2％，而固体含量为6.9％）。增加流速，导致流速最高为7 m / min，对空化强度没有影响。通过使反应器设计和静压适应基材特性，可以显着提高超声强度。这允许设计适合深度处理废水污泥的超声处理设备。