Effect of alkyl polyglycosides on the performance of thermophilic bacteria pretreatment for saline waste sludge hydrolysis

Pengtao Gao; Liang Guo; Jian Sun; Yi Wang; Zonglian She; Mengchun Gao; Yangguo Zhao; Chunji Jin

doi:10.1016/j.biortech.2019.122307

Effect of alkyl polyglycosides on the performance of thermophilic bacteria pretreatment for saline waste sludge hydrolysis

Bioresour Technol. 2020 Jan:296:122307. doi: 10.1016/j.biortech.2019.122307. Epub 2019 Oct 21.

Authors

Pengtao Gao¹, Liang Guo², Jian Sun¹, Yi Wang³, Zonglian She¹, Mengchun Gao¹, Yangguo Zhao¹, Chunji Jin¹

Affiliations

¹ College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
² College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China. Electronic address: geletu@ouc.edu.cn.
³ Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, United States.

PMID: 31675649
DOI: 10.1016/j.biortech.2019.122307

Abstract

In this study, alkyl polyglycosides (APG) was used to further accelerate the hydrolysis of saline waste sludge with thermophilic bacteria (TB) pretreatment. In the presence of 0.4 g/g TSS APG, the concentrations of soluble chemical oxygen demand (SCOD), soluble carbohydrate and soluble protein in dissolved organic matters (DOM) were 0.4, 2.4 and 1.3 times of that without APG addition, respectively. Excitation emission matrix (EEM) fluorescence spectroscopy revealed that the addition of APG led to the increase of soluble microbial materials and the decrease of fulvic acid-like substances in DOM, which was beneficial for the subsequent process of anaerobic digestion. Using APG promoted the releasing of enzymes trapped in saline waste sludge and improved the activity of enzymes during hydrolysis. The activities of α-glucosidase and protease increased by 8.8% and 21.3% respectively in the presence of 0.4 g/g TSS APG comparing no APG addition.

Keywords: Alkyl polyglycosides (APG); Hydrolytic enzyme activity; Saline waste sludge; Sludge hydrolysis; Thermophilic bacteria (TB).

MeSH terms

Anaerobiosis
Bacteria*
Biological Oxygen Demand Analysis
Hydrolysis
Sewage*
Spectrometry, Fluorescence
Waste Disposal, Fluid

Substances

Sewage