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

Hauser, Ingrid; Colaço, Ana; Skjæran, Julie; Einbu, Aslak; Østgaard, Kjetill; Svendsen, Hallvard; Cervantes, Francisco
February 2013
Applied Biochemistry & Biotechnology;Feb2013, Vol. 169 Issue 4, p1449
Academic Journal
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.


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