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Distribution of ash forming elements during pyrolysis of municipal wastewater sludge and sludge from milk processing factories

Kwapinska, Marzena and Agar, David and Leahy, James J. (2018). Distribution of ash forming elements during pyrolysis of municipal wastewater sludge and sludge from milk processing factories. I/In: UNSPECIFIED.
[Conference Paper]

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Abstract

In the long term, there is a need for alternative methods to recover energy and nutrients from increasing volumes of sludge generated from wastewater treatment plants. Pyrolysis can be an interesting option, which can reduce health and environmental risks, while providing an avenue for the recovery of energy and nutrients. One of the main concerns related to thermal conversion technologies is the release and fate of heavy metals and contaminants existing in the feedstock. Therefore, a detailed understanding of the transformation pathways of problematic compounds is necessary to assess the suitability of pyrolysis. In this study pyrolysis of dried dairy sludge and sewage sludge was carried out using a simple laboratory fixed bed reactor. Characterisation of the feedstock and pyrolysis products was performed through proximate and ultimate analysis and the content of major and minor ash forming elements were determined. The mass balance information obtained from the experimental tests was used for an indicative distribution of Al, Ca, Fe, K, Mg, Na, P, S, Si, As, Ba, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, Sb, Se, Ti, V and Zn between solid and liquid pyrolysis products. Results indicate that distribution of major elements between pyrolysis products was similar for dairy sludge and sewage sludge, with Ca, Mg, Fe, P, Si, Al, Na and K predominantly retained in pyrolysis chars (pyrogenic solids). However, substantial quantities of Al, K, Na and Si were detected in pyrolysis oil and in the aqueous fraction. The heavy metals and trace elements were mainly retained in the pyrolysis chars (pyrogenic solids) with the exception of As, Ba, Cd, Se, Sb and Pb, which were also detected in the liquid products.

Authors/Creators:Kwapinska, Marzena and Agar, David and Leahy, James J.
Title:Distribution of ash forming elements during pyrolysis of municipal wastewater sludge and sludge from milk processing factories
Year of publishing :2018
Number of Pages:12
Publisher:National Technical University of Athens
Language:English
Publication Type:Conference Paper (UNSPECIFIED)
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 204 Chemical Engineering > Chemical Process Engineering
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
URN:NBN:urn:nbn:se:slu:epsilon-p-109238
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109238
Additional ID:
Type of IDID
Otherhttp://uest.ntua.gr/naxos2018/proceedings/pdf/NAXOS2018_%20Kwapinska_etal.pdf
ID Code:19883
Faculty:S - Faculty of Forest Sciences
Department:(S) > Department of Forest Biomaterials and Technology
Deposited By: SLUpub Connector
Deposited On:30 Dec 2020 23:38
Metadata Last Modified:31 Dec 2020 06:01

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