Use of combined NaOH-microwave pretreatment for enhancing mesophilic anaerobic digestibility of thickened waste activated sludge

Yong Zhi Chi, Yu You Li, Min Ji, Hong Qiang, Heng Wei Deng, Ya Peng Wu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

A combined NaOH-microwave (MW) pretreatment process was studied in order to investigate the effects of NaOH-MW pretreated thickened waste activated sludge (TWAS) on anaerobic digestion. In the NaOH-MW pretreatment studies, Uniform design was successfully applied to determine the relationship of TWAS solubilization to environmental conditions (NaOH dose, target temperature, and MW holding time) and to establish the mathematical model describing the solubilization degree to changes in these variables. The maximum solubilization ratio (85.1%) of volatile suspended solids (VSS) could be achieved at 210° with 0.2 g-NaOH/g-SS and 35 min holding time. The biochemical methane potential (BMP) tests showed that all digesters fed with pretreated TWAS improved the methane production compared to control system, and the optimal conditions, at 170° with 0.05 g-NaOH/g-SS and 1 min holding time, were suggested for NaOH-MW pretreatment of TWAS. In spite of the increase in the soluble chemical oxygen demand concentration and decrease in the dewaterability of digested sludge, the semi-continuous reacter fed with the pretreated TWAS without neutralization was stable and gave higher organics reductions and methane yields compared to the control.

Original languageEnglish
Title of host publicationEnvironment Materials and Environment Management
Pages459-468
Number of pages10
DOIs
Publication statusPublished - 2010
Event2010 International Conference of Environment Materials and Environment Management, EMEM 2010 - Harbin, China
Duration: 2010 Jul 242010 Jul 25

Publication series

NameAdvanced Materials Research
Volume113-116
ISSN (Print)1022-6680

Other

Other2010 International Conference of Environment Materials and Environment Management, EMEM 2010
CountryChina
CityHarbin
Period10/7/2410/7/25

Keywords

  • Anaerobic digestibility
  • Mesophilic anaerobic digestion
  • NaOH-microwave pretreatment
  • Thickened waste activated sludge

ASJC Scopus subject areas

  • Engineering(all)

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