Mesophilic and thermophilic digestion of thickened waste activated sludge: A comparative study

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

7 Citations (Scopus)

Abstract

This paper presents an experimental study over 204 days on anaerobic degradation of thickened waste activated sludge (TWAS) from a municipal wastewater treatment plant (WWTP). The experiments were conducted under thermophilic (55°) and mesophilic (35°) condition, respectively, by using the semi-continuous flow completely mixed reactors. The influent total solids (TS), hydraulic retention time (HRT) and chemical oxygen demand (COD) loading levels were around 4%, 30 days and 1.67 kg-CODCr· m-3·d-1 , respectively. During the opration period, the thermophilic anaerobic digestion process (TADP) and the mesophilic anaerobic digestion process (MADP) were stable and well-functioned without ammonia inhibition. Particulate organic matters reduction of TADP was superior to that of MADP. This result implies that TADP has higher sludge reduction efficiency than MADP. According to the simulated chemical formula of TWAS, C5.85H9.75O3.96N, and the stoichiometric equation, the methane content and the ammonia yield in the anaerobic process could be calculated, which were consistent with the experimental results. The methane yield of TADP was a little higher than that of MADP. The statistical mean values of methane content for TADP and MADP were 60.97% and 62.38%, respectively.According to paired t-test, there was a significant difference in methane content between TADP and MADP(α=0.01, n=62). Compared with the mesophilic digested sludge, the dewaterability of thermophilic digested sludge was lower.

Original languageEnglish
Title of host publicationEnvironment Materials and Environment Management
Pages450-458
Number of pages9
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 digestion
  • Comparison
  • Mesophilic
  • Thermophilic
  • Thickened waste activated sludge

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Mesophilic and thermophilic digestion of thickened waste activated sludge: A comparative study'. Together they form a unique fingerprint.

Cite this