Biological N removal from wastes generated from amine-based CO2 capture: case monoethanolamine

Appl Biochem Biotechnol. 2013 Feb;169(4):1449-58. doi: 10.1007/s12010-012-0075-0. Epub 2013 Jan 13.

Abstract

Large-scale amine-based CO(2) capture will generate waste containing large amounts of ammonia, in addition to contaminants such as the actual amine as well as degradation products thereof. Monoethanolamine (MEA) has been a dominant amine applied so far in this context. This study reveals how biological N removal can be achieved even in systems heavily contaminated by MEA in post- as well as pre-denitrification treatment systems, elucidating the rate-limiting factors of nitrification as well as aerobic and denitrifying biodegradation of MEA. The hydrolysis of MEA to ammonia readily occurred both in post- and pre-denitrification treatment systems with a hydraulic retention time of 7 h. MEA removal was ≥99 ± 1 % and total nitrogen removal 77 ± 10 % in both treatment systems. This study clearly demonstrates the advantage of pre-denitrification over post-denitrification for achieving biological nitrogen removal from MEA-contaminated effluents. Besides the removal of MEA, the removal efficiency of total nitrogen as well as organic matter was high without additional carbon source supplied.

MeSH terms

  • Ammonia / metabolism
  • Carbon Dioxide / metabolism*
  • Ethanolamine / metabolism*
  • Nitrification

Substances

  • Carbon Dioxide
  • Ethanolamine
  • Ammonia