Title

Biological N Removal from Wastes Generated from Amine-Based CO Capture: Case Monoethanolamine.

Authors

Hauser, Ingrid; Colaço, Ana; Skjæran, Julie; Einbu, Aslak; Østgaard, Kjetill; Svendsen, Hallvard; Cervantes, Francisco

Abstract

Large-scale amine-based CO 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.

Subjects

BIODEGRADATION; CARBON sequestration; DENITRIFICATION; AMMONIA; GREENHOUSE gas mitigation

Publication

Applied Biochemistry & Biotechnology, 2013, Vol 169, Issue 4, p1449

ISSN

0273-2289

Publication type

Academic Journal

DOI

10.1007/s12010-012-0075-0