Issue 60, 2015

Combination of ultrasound and Fenton treatment for improving the hydrolysis and acidification of waste activated sludge

Abstract

The effects of ultrasound (US), Fenton treatment, and combined US/Fenton treatment as physicochemical pretreatment processes for waste activated sludge (WAS) hydrolysis and acidification were investigated in this study. The soluble carbohydrate concentrations after US/Fenton treatment were 2.36-fold, 2.17-fold and 17.11-fold more than that obtained by the Fenton treatment, US and control tests, respectively. The corresponding concentrations of soluble protein after US/Fenton treatment were 2.43-fold, 1.47-fold and 13.37-fold more than that obtained by the Fenton treatment, US and control tests, respectively. The degree of sludge disintegration (DDCOD) for the US/Fenton treatment was 15.4%, whereas it was only 9.97% and 3.18% for the US and Fenton tests. The maximum accumulation of volatile fatty acids (VFAs) was obtained by the US/Fenton pretreatment (4594 mg COD L−1), which presented obvious advantages over US (3485 mg COD L−1) and Fenton (2700 mg COD L−1) treatments. The combination of the US and Fenton treatments had a synergetic effect on improving the hydrolysis and subsequent acidification of WAS.

Graphical abstract: Combination of ultrasound and Fenton treatment for improving the hydrolysis and acidification of waste activated sludge

Article information

Article type
Paper
Submitted
01 Apr 2015
Accepted
18 May 2015
First published
18 May 2015

RSC Adv., 2015,5, 48468-48473

Combination of ultrasound and Fenton treatment for improving the hydrolysis and acidification of waste activated sludge

H. Bao, L. Jiang, C. Chen, C. Yang, Z. He, Y. Feng, W. Cai, W. Liu and A. Wang, RSC Adv., 2015, 5, 48468 DOI: 10.1039/C5RA05791D

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