Achieving waste to energy through sewage sludge gasification using hot slags: syngas production

To relieve the environmental issues of sewage sludge (SS) disposal and greenhouse gas (GHG) emission in China, we proposed an integrated method for the first time to simultaneously deal with these two problems. The hot slags below 920 °C could act as a good heat carrier for sludge gasification and t...

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Main Authors:	Sun, Yongqi, Nakano, Jinichiro, Liu, Lili, Wang, Xidong, Zhang, Zuotai
Format:	Online
Language:	English
Published:	Nature Publishing Group 2015
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4466782/

id	pubmed-4466782
recordtype	oai_dc
spelling	pubmed-44667822015-06-18 Achieving waste to energy through sewage sludge gasification using hot slags: syngas production Sun, Yongqi Nakano, Jinichiro Liu, Lili Wang, Xidong Zhang, Zuotai Article To relieve the environmental issues of sewage sludge (SS) disposal and greenhouse gas (GHG) emission in China, we proposed an integrated method for the first time to simultaneously deal with these two problems. The hot slags below 920 °C could act as a good heat carrier for sludge gasification and the increasing CO2 concentration in CO2/O2 atmospheres enhanced the production of CO and H2 at 400–800 °C. Three stages of syngas release were clearly identified by Gaussian fittings, i.e., volatile release, char transformation and fixed carbon reaction. Additionally, the effect of sulfur retention of slags and the synergy effect of the stabilization of toxic elements in the solid residuals were discovered in this study. Furthermore, a novel prototype of multiple industrial and urban systems was put forward, in which the produced CO + H2 could be utilized for direct reduced iron (DRI) production and the solid residuals of sludge ash and glassy slags would be applied as cementitious materials. For a steel plant with an annual production of crude steel of 10 million tons in China, the total annual energy saving and GHG emission reduction achieved are 3.31105 tons of standard coal and 1.74106 tons of CO2, respectively. Nature Publishing Group 2015-06-15 /pmc/articles/PMC4466782/ /pubmed/26074060 http://dx.doi.org/10.1038/srep11436 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Sun, Yongqi Nakano, Jinichiro Liu, Lili Wang, Xidong Zhang, Zuotai
spellingShingle	Sun, Yongqi Nakano, Jinichiro Liu, Lili Wang, Xidong Zhang, Zuotai Achieving waste to energy through sewage sludge gasification using hot slags: syngas production
author_facet	Sun, Yongqi Nakano, Jinichiro Liu, Lili Wang, Xidong Zhang, Zuotai
author_sort	Sun, Yongqi
title	Achieving waste to energy through sewage sludge gasification using hot slags: syngas production
title_short	Achieving waste to energy through sewage sludge gasification using hot slags: syngas production
title_full	Achieving waste to energy through sewage sludge gasification using hot slags: syngas production
title_fullStr	Achieving waste to energy through sewage sludge gasification using hot slags: syngas production
title_full_unstemmed	Achieving waste to energy through sewage sludge gasification using hot slags: syngas production
title_sort	achieving waste to energy through sewage sludge gasification using hot slags: syngas production
description	To relieve the environmental issues of sewage sludge (SS) disposal and greenhouse gas (GHG) emission in China, we proposed an integrated method for the first time to simultaneously deal with these two problems. The hot slags below 920 °C could act as a good heat carrier for sludge gasification and the increasing CO2 concentration in CO2/O2 atmospheres enhanced the production of CO and H2 at 400–800 °C. Three stages of syngas release were clearly identified by Gaussian fittings, i.e., volatile release, char transformation and fixed carbon reaction. Additionally, the effect of sulfur retention of slags and the synergy effect of the stabilization of toxic elements in the solid residuals were discovered in this study. Furthermore, a novel prototype of multiple industrial and urban systems was put forward, in which the produced CO + H2 could be utilized for direct reduced iron (DRI) production and the solid residuals of sludge ash and glassy slags would be applied as cementitious materials. For a steel plant with an annual production of crude steel of 10 million tons in China, the total annual energy saving and GHG emission reduction achieved are 3.31105 tons of standard coal and 1.74106 tons of CO2, respectively.
publisher	Nature Publishing Group
publishDate	2015
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4466782/
_version_	1613235526968541184

Achieving waste to energy through sewage sludge gasification using hot slags: syngas production

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