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

• Published in: Bioresource technology Vol. 296; p. 122307
• Main Authors: Gao, Pengtao, Guo, Liang, Sun, Jian, Wang, Yi, She, Zonglian, Gao, Mengchun, Zhao, Yangguo, Jin, Chunji
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.01.2020
• Subjects: Alkyl polyglycosides (APG); Anaerobiosis; Bacteria; Biological Oxygen Demand Analysis; Hydrolysis; Hydrolytic enzyme activity; Saline waste sludge; Sewage; Sludge hydrolysis; Spectrometry, Fluorescence; Thermophilic bacteria (TB); Waste Disposal, Fluid; Saline waste sludge; Sludge hydrolysis; Thermophilic bacteria (TB); Alkyl polyglycosides (APG); Hydrolytic enzyme activity
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2019.122307

[Display omitted] •Alkyl polyglycosides can promote saline waste sludge hydrolysis pretreated with TB.•The hydrolase activity in saline waste sludge was improved by alkyl polyglycosides.•Alkyl polyglycosides was efficient in increasing organic compounds in DOM.•The biodegradability of saline waste sludge was enhanced with alkyl polyglycosides. 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.