Oxidative degradation of dinitrotoluenes (DNTs) in industrial wastewater was conducted by sono-activated persulfate process assisted with electrolytes. Experiments were carried out to elucidate the influence of various operating parameters on the sonolytic behavior, such as species and concentrations of electrolytes, ultrasonic power intensity, reaction temperature, dosage of oxygen and persulfate anions. The outcomes indicate that sulfate radicals serve as main oxidants in the sono-activated persulfate process, wherein MgSO₄ electrolyte obviously inhibits microbubble coalescence, leading to enhancement of cavitation strength and DNTs removal percentage. On addition of electrolytes, the increment of DNTs removal percentages was proportional to ionic strength of electrolytes. According to the results obtained from gas chromatograph-mass spectrometer (GC–MS), it is postulated that DNTs initially undergo denitration pathway with cleavage of nitro group into o-mononitrotoluene (MNT) or oxidation of methyl group followed with decarboxylation procedure into 1,3-dinitrobenzene (DNB), respectively. Due to electrolytes observed commonly in wastewater, the sono-activated persulfate process coupled with electrolytes is potentially applied to dispose wastewater effluent from toluene nitration processes.

工业废水中的二硝基甲苯（DNT）的氧化降解是通过声活化过硫酸盐法在电解质的辅助下进行的。进行实验以阐明各种操作参数对声解行为的影响，例如电解质的种类和浓度，超声功率强度，反应温度，氧和过硫酸根阴离子的用量。结果表明，硫酸根自由基是声活化过硫酸盐过程中的主要氧化剂，其中MgSO ₄电解质明显抑制了微泡的聚结，从而提高了空化强度和DNTs的去除率。添加电解质后，DNTs去除百分比的增加与电解质的离子强度成正比。根据从气相色谱质谱仪（GC-MS）获得的结果，推测DNTs最初会经历脱硝途径，其中硝基被裂解为邻一硝基甲苯（MNT）或甲基被氧化，然后再进行脱羧反应，得到1， 3-二硝基苯（DNB）。由于废水中通常观察到电解质，因此将声活化过硫酸盐工艺与电解质结合起来可潜在地用于处理甲苯硝化工艺中产生的废水。