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Bioresour Technol. 2016 Nov;219:614-623. doi: 10.1016/j.biortech.2016.08.042. Epub 2016 Aug 12.

Structural and functional properties of organic matters in extracellular polymeric substances (EPS) and dissolved organic matters (DOM) after heat pretreatment with waste sludge.

Author information

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. Electronic address: geletu@ouc.edu.cn.
3
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.

Abstract

The effects of heat pretreatment on waste sludge hydrolysis were investigated in this study. Heat pretreatment was conducted at 65°C, 80°C, 100°C and 121°C for 5min, 10min, 15min, 20min, 25min and 30min. Not only analyzed the changes of SCOD (Soluble chemical oxygen demand), carbohydrate and protein, but also evaluated the structural and functional properties of organics in extracellular polymeric substances (EPS) and dissolved organic matters (DOM) by using three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy with fluorescence regional integration (FRI) analysis. The SCOD in DOM increased with pretreated temperatures. The optimal heat hydrolysis temperature and time were selected by further studying the biodegradable and non-biodegradable components. After treated at 80°C for 25min, the fluorescence intensity and percent fluorescence response (Pi,n) of easily biodegradable soluble microbial by-product substance were higher than others, and little non-biodegradable fulvic acid-like substance was accumulated.

KEYWORDS:

Dissolved organic matters (DOM); Excitation-emission matrix (EEM); Extracellular polymeric substances (EPS); Heat hydrolysis; Waste sludge

PMID:
27544911
DOI:
10.1016/j.biortech.2016.08.042
[Indexed for MEDLINE]

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