Ultrasound of frequency 1.8?MHz,sound intensity 1-5 ?W·cm -2 was used to induce sonochemical reaction in a near field acoustic sonoreactor.It was found that the sonochemical yield is linearly related to sound int...Ultrasound of frequency 1.8?MHz,sound intensity 1-5 ?W·cm -2 was used to induce sonochemical reaction in a near field acoustic sonoreactor.It was found that the sonochemical yield is linearly related to sound intensity and irradiation time. The cavitational bubble’s amount and sonochemical reaction dynamic equation in cavitational sound field were also presented.展开更多
为了考察动态情况下超声波破解污泥的效果,采用连续式超声波发生器研究不同频率、声能密度、停留时间和发生方式下污泥溶解性化学需氧量(soluble chemical oxygendemand,SCOD)和架桥离子的质量浓度变化。结果表明:25 kHz的超声波较利于...为了考察动态情况下超声波破解污泥的效果,采用连续式超声波发生器研究不同频率、声能密度、停留时间和发生方式下污泥溶解性化学需氧量(soluble chemical oxygendemand,SCOD)和架桥离子的质量浓度变化。结果表明:25 kHz的超声波较利于污泥破解;增加声能密度和延长停留时间能促进污泥破解,且时间影响较大。在25 kHz、125 W/L、138.8 s时,ρ[SCOD]增幅为68.4%。由于Ca2+、Mg2+两种离子在污泥中作用不同,其质量浓度随污泥破解变化规律不同。平行布置的组合作用方式对污泥的破解较差。因此,在动态情况下超声波能有效破解污泥,但需要结合实际选择合适参数和反应器结构。展开更多
文摘Ultrasound of frequency 1.8?MHz,sound intensity 1-5 ?W·cm -2 was used to induce sonochemical reaction in a near field acoustic sonoreactor.It was found that the sonochemical yield is linearly related to sound intensity and irradiation time. The cavitational bubble’s amount and sonochemical reaction dynamic equation in cavitational sound field were also presented.