Evaluation of Substances Released from Hydrothermal Pretreated Municipal Sludge and Performance of Hydrogen Production by the Corresponding Supernatant

Abstract:

Response surface methodology (RSM) with central composite design was adopted to investigate the optimum condition for carbohydrate released from hydrothermal pretreated sludge in an autoclave used for WAO (wet air oxidation). Temperature, time and stirring rate were chosen as variables. The maximum carbohydrate release (1356.8 mg/L) was estimated at the temperature of 161.2 °C, the time of 48 min and the stirring rate of 661 r/min. This statistical method could precisely optimize reaction conditions and predict the experimental data. Only 11.2 mL methane was generated with little hydrogen production of raw sludge. In contrast, hydrogen production potential of 25 mL was reached by using supernatant as substrate with a COD removal of 78.14%. Hydrogen yield was increased from 0.13 mL/g-VS (raw sludge) to 13.16 mL/g-VS (supernatant of pretreated sludge).

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 2468-2475
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.2468
• Online since: August 2013
• Authors: Li Yu, Cheng Lin Sun, Yong Hui Yu, Wen Tian Jiang
• Keywords: Fermentation, Hydrogen, Hydrothermal, Pretreatment, Response Surface Methodology (RSM)

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