中文摘要：

针对模拟水样中的腐殖酸，采用静态实验研究了在低声能密度0．028W·m-l条件下，单频超声（68、80、100、125和160kHz）和双频复合超声（x-y轴轴向正交超声：80／125kHz和80／160kHz；x-x轴轴向平行超声：68／100kHz和125／160kHz）在不同时间下对溶解性有机碳（DOC）和三卤甲烷前体物（THMFP）的去除效果。结果表明：在同一声能密度下，低频（68和80kHz）对DOC和THMFP的去除效果比高频（100、125和160kHz）下的去除效果好，双频复合超声的去除效果均优于单频超声，且X-Y轴轴向正交超声降解效能均优于x-x轴轴向平行超声。双频复合超声的X-Y轴轴向正交组合80／160kHz超声25min去除效果最好，其中DOC和THMFP去除率分别可达到32．6％和66．6％。

英文摘要：

To understand the degradation of humic acid in simulated water a series of static experiments assisted with ultrasound were done at various energy density of ultrasound produced by both single-frequency （68 kHz, 80 kHz, 100 kHz, 125 kHz and 160 kHz） and dual-frequency （X-Y axial orthogonal 80/125 kHz and 80/160 kHz and X-X axis parallel 68/100 kHz and 125/160 kHz） ultrasound irradiation system. The degradation of dissolved organic carbon （DOC） and trihalomathame precursors （THMFP） were measured. The main results obtained are as follows： for the same energy density of sound, the degradation efficiency is better for low frequency （68 kHz and 80 kHz） than for high frequency ultrasound （100 kHz, 125 kHz, and 160 kHz）, dual-frequency is superior to single-frequency, and X-Y axial orthogonal ultrasound excels X-X axis parallel. The best result for degradation of COD and THMFP is obtained in 25 min by using X-Y axial orthogonal combination of 80/160 kHz ultrasound, and is 32.6% and 66.6% respectively.