低强度超声对活性污泥好氧/缺氧消化的影响。

Effect of low power ultrasound on aerobic/anoxic digestion of activated sludge.

机构信息

Guangdong University of Technology, Guangzhou, China.

出版信息

Water Sci Technol. 2012;65(5):970-5. doi: 10.2166/wst.2012.451.

DOI:10.2166/wst.2012.451

Abstract

The effect of low power ultrasound on aerobic/anoxic digestion of activated sludge was investigated. First, dehydrogenate activity (DHA) and special oxygen uptake rate (SOUR) were detected to indicate the change of biological activity of sludge induced by ultrasound. Single-factor experiments showed that when the ultrasonic frequency was 28 kHz, the optimal ultrasonic density and exposure time were 0.15 W/mL and 10 min, respectively. Through orthogonal tests, the optimal ultrasonic parameters for aerobic/anoxic digestion were found to be a ultrasonic density of 0.15 W/mL, ultrasonic exposure time of 10 min and interval time of 12 h. The aerobic/anoxic digestion was improved by ultrasonic pretreatment, the VSS reduction at the optimal conditions was increased by 35.73%, compared with the control. It can be concluded that low power ultrasonic pretreatment is a valid method for improving aerobic/anoxic biodegradability of activated sludge.

摘要

研究了低功率超声对好氧/缺氧消化活性污泥的影响。首先，检测脱氢酶活性（DHA）和比耗氧速率（SOUR），以表明超声诱导的污泥生物活性的变化。单因素实验表明，当超声频率为 28 kHz 时，最佳超声密度和暴露时间分别为 0.15 W/mL 和 10 min。通过正交试验，发现好氧/缺氧消化的最佳超声参数为超声密度 0.15 W/mL、超声暴露时间 10 min 和间隔时间 12 h。超声预处理可改善好氧/缺氧消化，在最佳条件下，挥发性悬浮固体（VSS）的减少量比对照增加了 35.73%。可以得出结论，低功率超声预处理是提高活性污泥好氧/缺氧生物降解性的有效方法。