Thermo-economic analysis of syngas production from wet digested sewage sludge by gasification process

Sepehr Sanaye, Pouria Alizadeh and Mohsen Yazdani

Renewable Energy, 2022, vol. 190, issue C, 524-539

Abstract: Digested sewage sludge (digestate) which is a by-product during treatment of municipal wastewater can be regarded as a reliable biological resource for production of bioenergy as a form of renewable energy. In this study, clean syngas production by gasification process of wet digestate is modeled and analyzed for the effluent of anaerobic digesters at Tehran South Wastewater Treatment Plant. The issues of allowable amounts of inlet feedstock moisture content into different gasifying systems and the criteria for selecting a proper type of gasifier are few in the available literature. Thus, thermal gasification technology (dual fluidized-bed (DFB) steam gasifier coupled with a dryer) and emerging supercritical water (SCW) gasification technology are modeled and investigated here. Results show that the hydrogen mole fraction in the syngas produced by dryer-DFB gasifier is about 0.55 which is almost 11% higher than that for SCW gasifier. However, the SCW gasifier has about 8% higher overall system efficiency (22.6%). Economic assessment shows that SCW gasifier has 19% lower levelized cost of clean syngas production (82.5 $/GJ) than dryer-DFB gasifier (102 $/GJ). Therefore, the SCW gasifier is generally preferred based on thermo-economic analysis of clean syngas production from very wet (75%) digestate.

Keywords: Digested sewage sludge; Dryer; Dual fluidized-bed gasifier; Supercritical water gasifier; Thermo-economic analysis (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148122003706
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:190:y:2022:i:c:p:524-539

DOI: 10.1016/j.renene.2022.03.086

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().