高频超声降解造纸黑液的研究

Study on the degradation of black liquor by using high-frequency ultrasound

以武汉晨鸣纸业的黑液为研究对象,采用1040kHz的高频超声处理造纸黑液。考察了不同频率、饱和气体、离子强度、催化剂等对超声降解效果的影响。结果如下:(1)与低频超声相比,高频超声有更强的降解有机物的能力,在30min的反应时间内CODCr的去除率达到20.8%;(2)溶解气体的存在,有利于大分子有机物的降解;(3)加入适量的NaCl能强化超声降解效果;(4)TiO2的存在可提高超声降解效果。

The black liquor (taken from Wuhan Chenming Papermaking Co., Ltd.) was sonicated by 1 040 kHz ultrasound (US). The effects of US frequency, dissolved gas, ionic strength and coexist catalyst on ultrasonic degradation efficiency of black liquor have been studied. The results are as follow:(1)Compared with the low frequency US, high frequency US has stronger capability of the degradation of organic contaminants. In the first 30 min, the removal ratio of CODCr is 20.8%;(2)High?鄄molecule contaminants are easier to be degraded with the dissolved gas coexisting;(3)Addition of appropriate NaCl enhanced the degradation efficiency of black liquor; (4)Coexistent TiO2 increases the ultrasonic degradation efficiency.