Enhanced activity of methanogenic granules by low-strength ultrasonication

Si Kyung Cho, Dong Hoon Kim, Moon Hwan Kim, Hang Sik Shin, Sae Eun Oh

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In this study, low-strength ultrasonication was applied at various ultrasonication densities (UDs) (0-0.1W/mL) and ultrasonication time (UT) (0-30min) to methanogenic granules on the purpose of increasing their activity, and eventually, enhancing the performance of upflow anaerobic sludge blanket reactor (UASBr). Batch test results showed that 5min of ultrasonication at 0.05W/mL was found to be the optimal conditions, resulting in the increase of dehydrogenase activity and adenosine triphosphate content by 257%, and 374%, respectively, compared to the control. These increments were confirmed by specific methanogenic activity test. When ultrasonication (UD 0.05W/mL, UT 5min) was irradiated every 8h during the continuous operation of UASBr, it caused a gradual drop of methanogenic activity, complete loss after 20days. At further operation, UT was decreased to 1s but irradiated every 1min, which resulted in a 43% higher specific CH4 production rate.

Original languageEnglish
Pages (from-to)84-88
Number of pages5
JournalBioresource Technology
Volume120
DOIs
StatePublished - Sep 2012

Keywords

  • Adenosine triphosphate (ATP)
  • Dehydrogenase activity (DHA)
  • High rate anaerobic treatment system
  • Low strength ultrasonication
  • Upflow anaerobic sludge blanket reactor (UASBr)

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