Kinetic analysis of biological degradation for tetramethylammonium hydroxide (TMAH) in the anaerobic activated sludge system at ambient temperature

Bing Liu, Kohei Yoshinaga, Jer Horng Wu, Wei Yu Chen, Mitsuharu Terashima, Rajeev Goel, Domenico Pangallo, Hidenari Yasui

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

With rapid development of thin-film transistor liquid crystal display industries, improvements of the wastewater treatments for spent developing fluid (Tetramethylammonium hydroxide (TMAH)) is essential. As an alternative to the conventional aerobic processes, an anaerobic process in ambient temperature composed of a suspended sludge reactor and subsequent two gravity thickeners with addition of flocculants was elaborated. Methylotrophic TMAH-degraders were enriched from an anaerobic digester at a municipal wastewater treatment plant, feeding TMAH as a sole substrate. In the system TMAH was converted to methane via methanol whilst trimethylamine, dimethylamine, monomethylamine and ammonium were sequentially produced with the biomass yield of 0.14 gCOD/gTMAH, maximum specific growth rate at 0.372 d−1 and specific decay rate at 0.017 d−1 under 23 °C. The system could remove TMAH at 0.37–1.2 kgTMAH/m3/d with 2000–6000 mg/L of sludge concentration in the reactor, and achieved low effluent dissolved organics at about 2–5 mgC/L. A kinetic model of TMAH degradation, including cryptic growth of ordinary acidogens, acetotrophic and hydrogenotrophic methanogens from the decayed TMAH-degraders was built, and validated using a quantitative PCR method. Since the calculated fractions of bacterial and archaeal biomass were consistent with those detected, the kinetic model based on the metabolic pathways could be used as a design platform to maximise the target species and reaction rates in the new system.

Original languageEnglish
Pages (from-to)42-49
Number of pages8
JournalBiochemical Engineering Journal
Volume114
DOIs
Publication statusPublished - 2016 Oct 15

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Bioengineering
  • Biomedical Engineering

Fingerprint Dive into the research topics of 'Kinetic analysis of biological degradation for tetramethylammonium hydroxide (TMAH) in the anaerobic activated sludge system at ambient temperature'. Together they form a unique fingerprint.

Cite this