Experimental study on sludge reduction by ultrasound

被引：28

作者：

Cao, X. Q. ^{[1
]}

Chen, J. ^{[1
]}

Cao, Y. L. ^{[1
]}

Zhu, J. Y. ^{[1
]}

Hao, X. D. ^{[1
]}

机构：

[1] Beijing Inst Civil Engn & Architecture, R&D Ctr Sustainable Environm Biotechnol, Beijing 100044, Peoples R China

来源：

WATER SCIENCE AND TECHNOLOGY | 2006年 / 54卷 / 09期

关键词：

observed sludge yield; sludge reduction; sonication time; ultrasonic intensity; ultrasound;

D O I：

10.2166/wst.2006.872

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In recent years, considerable impetus emerges to develop strategies for reducing excess sludge produced in biological wastewater treatment (BWT) systems. In this study, an experiment on sludge reduction by ultrasound treatment was conducted. The influences of sonication on observed yield, sludge reduction, effluent quality, sludge settleability and stability were extensively evaluated. It was found that ultrasound had an impressive potential to reduce sludge production. Moreover, it was also concluded that a treatment time of 10 minutes was more cost-effective for sludge reduction, and a reduction by 44% was reached with an ultrasonic intensity of 0.25 w/ml. The reduction could be mainly attributed to disintegration of bio-flocs and cryptic growth. In addition, sonication time seemed to be more effective to reduce sludge production compared with ultrasonic intensity. Slight deterioration of the effluent quality and some variations of the sludge settleability and stability were observed after ultrasound treatment.

引用

页码：87 / 93

页数：7

共 14 条

[1]

[曹秀芹 Cao Xiuqin], 2005, [环境工程, Environment engineering], V23, P84

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