The Optimization of Thermal Pre-Treatment Time for Extracellular Polymeric Substances Extraction from Sewage Sludge

Abstract:

This study aims to find out the optimum extraction time varied from 5 min to 60 min for extracellular polymeric substances (EPS) from sewage sludge pretreated at 80 °C. The change of the contents of EPS and its components under different time limit were recorded and compared. The results showed: the contents of soluble protein, TOC, soluble sugar and DNA was increased by 579.17 mg/l, 514.25 mg/l, 132.79 mg/l, and 34.69 mg/l, respectively, with the increase of thermal pre-treatment time during the process, and the DNA content increased the least, which indicating that the effect of thermal pre-treatment at 80 °C on cell lysis of sewage sludge was small. The EPS content, as a whole, was increased with the increase of thermal pre-treatment time. By analyzing the experimental data with the Analytic Hierarchy Process Model, which was used to identify the optimum thermal pre-treatment time of extracting EPS, the results showed that the effectiveness of EPS extraction from sludges was 30 min>60 min>50 min>20 min>40 min>10 min>5 min. Therefore, the 30 min was choosed as the optimum thermal pre-treatment time.

• Periodical: Applied Mechanics and Materials (Volume 768)
• Pages: 496-505
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.768.496
• Online since: June 2015
• Authors: Yu Yi Zheng, Hong Lin, Zhi Long Lin, Yi Fang Zeng, Yu Fang Yu, Chang Qing Liu*
• Keywords: Analytic Hierarchy Process, Extracellular Polymeric Substances, Optimization, Sewage Sludge, Thermal Pre-Treatment Time

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