NDLI: Catalytic gasification of digestate sludge in supercritical water on the pilot plant scale

Content Provider	Springer Nature Link
Author	Boukis, Nikolaos Hauer, Elena Herbig, Sophia Sauer, Jörg Vogel, Frédéric
Copyright Year	2017
Abstract	Gasification in supercritical water can be assisted with heterogeneous catalysts. Effective salt separation upstream of the catalyst is important to avoid poisoning of the catalyst and to recover nutrients. Recovery of phosphorus and nitrogen as well as gasification of a significant portion of the organic carbon were demonstrated on the pilot plant scale. A Ru/C catalyst was applied to catalyze the formation of CH$_{4}$, which was the desired primary gasification product. On top of the catalyst, a bed of ZnO was used as sulfur adsorbent to protect the catalyst from deactivation. As feedstock for the process, glycerol, ethanol, and digestate sludge were studied. The results confirm the activity of the catalyst under the applied conditions. At a reaction temperature of 420 °C and a pressure of 280 bar, a gas composition close to thermodynamic equilibrium was achieved. Salt separation performed at 470 °C was effective, but the separation efficiency was less for potassium than for phosphorus. Fifty-six percent of the ash contained in digestate sludge was separated and recovered. Sulfur partly escaped the salt separation system and reached the reactor. The ZnO layer trapped most of this remaining sulfur. The remaining sulfur contamination was low enough not to poison the Ru/C catalyst completely. In total, 326 kg of glycerol, 334 kg of digestate sludge, and 167 kg of ethanol were gasified without any operational issues.
Starting Page	415
Ending Page	424
Page Count	10
File Format	PDF
ISSN	21906815
Journal	Biomass Conversion and Biorefinery
Volume Number	7
Issue Number	4
e-ISSN	21906823
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-01-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gasification Methane Catalytic conversion Sludge Salt separation Zinc oxide Renewable and Green Energy Biotechnology
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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