4.8 Article

Optimization of thermal hydrolysis process for enhancing anaerobic digestion in a wastewater treatment plant with existing primary sludge fermentation

期刊

BIORESOURCE TECHNOLOGY
卷 321, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124498

关键词

Anaerobic digestion; Thermal hydrolysis process (THP); Biomethane; Thickened waste activated sludge (TWAS); Fermented primary sludge (FPS)

资金

  1. Collaborative Research and Development Grant (CRD) - Natural Sciences and Engineering Research Council of Canada (NSERC)
  2. EPCOR Water Services
  3. John R. Evans Leaders Fund from the Canada Foundation for Innovation (CFI)

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The study found that a temperature of 180 degrees Celsius was most effective for sludge solubilization, and the THP method of FPS + TWAS achieved higher methane yield compared to the pretreatment of TWAS alone.
Many wastewater treatment plants (WWTPs) adopted primary sludge fermentation to produce sludge liquor for the biological denitrification process. The fermented primary sludge (FPS) is usually co-digested with thickened waste activated sludge (TWAS) in the anaerobic digestion (AD) process. To date, there has been limited information on how the sludge thermal hydrolysis process (THP) could be retrofitted for enhancing AD in WWTPs with the existing primary sludge fermentation process. This study assessed two THP retrofitting schemes, (FPS + TWAS and TWAS alone) combining different exposure times (15, 30, and 60 min) and temperatures (140, 160, and 180 degrees C). The results suggested that temperature had more impact on sludge solubilization than exposure times. Notably, 180 degrees C was the most effective for sludge solubilization under both schemes. However, a higher degree of solubilization did not necessarily lead to higher methane yields. The THP of FPS + TWAS attained considerably higher methane yield than the pretreatment of TWAS alone.

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