Universität zu Köln

Brueck, Felix, Ufer, Kristian, Mansfeldt, Tim ORCID: 0000-0002-7557-6827 and Weigand, Harald (2019). Continuous-feed carbonation of waste incinerator bottom ash in a rotating drum reactor. Waste Manage., 99. S. 135 - 146. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0956-053X

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Abstract

Carbonation is a key process in the aging of waste incinerator bottom ash (BA). The reaction with CO2 decreases the BA alkalinity and lowers the leachability of amphoteric trace metals. Passive ageing over several months is usually performed in intermittently mixed BA heaps. Here we aimed at accelerating the process in a rotating drum reactor continuously fed with the BA and the reactant gas (10 vol-% CO2, volumetric flow rate 60 L/min). In one test, the gas was heated and humidified. Since carbonation depends on the specific CO2-supply, experiments were conducted at varied BA residence time (60, 80, and 100 min). Residence time was calculated by mass balancing and confirmed by the breakthrough time of two tracers. Leachates and solid phase properties of the treated BA served to evaluate the carbonation performance. The residence time of BA could be adequately controlled by the reactor loading and feed rate. A residence time of 80 min was sufficient to reduce the BA leachability such as to comply with the German regulatory standards for non-hazardous waste, whereas the untreated BA was hazardous waste. Decreased alkalinity was indicated by lower leachate pH and Ca(OH)(2) contents of the BA as compared to the input. Leachate concentrations of amphoteric trace metals (Pb, Zn, Cu) decreased by at least one order of magnitude while oxyanions became slightly more mobile upon carbonation. In view of relatively short residence times and stable process performance, the rotating drum reactor seems promising for a full-scale implementation of BA carbonation. (C) 2019 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Brueck, Felix UNSPECIFIED UNSPECIFIED UNSPECIFIED Ufer, Kristian UNSPECIFIED UNSPECIFIED UNSPECIFIED Mansfeldt, Tim UNSPECIFIED orcid.org/0000-0002-7557-6827 UNSPECIFIED Weigand, Harald UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-130007
DOI:	10.1016/j.wasman.2019.08.026
Journal or Publication Title:	Waste Manage.
Volume:	99
Page Range:	S. 135 - 146
Date:	2019
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0956-053X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Geographisches Institut
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ACCELERATED CARBONATION; LEACHING BEHAVIOR; AQUEOUS-SOLUTIONS; TRACE-ELEMENTS; MSWI; HYDROTALCITE; PERSPECTIVES; ADSORPTION; REMOVAL; DIOXIDE Multiple languages Engineering, Environmental; Environmental Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13000