Characteristics of Liquid Products in Supercritical Water Gasification of Municipal Sewage Sludge by Continuous Flow Tub
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ORIGINAL PAPER
Characteristics of Liquid Products in Supercritical Water Gasification of Municipal Sewage Sludge by Continuous Flow Tubular Reactor Elanur Adar1 · Mahir Ince2 · Mehmet Sinan Bilgili3 Received: 11 March 2019 / Accepted: 16 October 2019 © Springer Nature B.V. 2019
Abstract Sewage sludge is a by-product of wastewater treatment, containing high water and organic content. Supercritical water gasification provides sustainable treatment for biomass sources such as sewage sludge. In this study, the effects of operating conditions (temperature, solid matter content and catalyst) and raw material properties on the resulting liquid products were determined in order to exhibit the success of this innovative technology for treatment and disposal of municipal sewage sludge using a continuous flow pilot-scale tubular reactor for the first time in Turkey. As a result of the study, it was determined that the higher the temperature, the higher the quality of the liquid product. TOC removal efficiencies increased from 84.4% to 99% with increasing the temperature from 450 to 650 °C, for 1% solid matter content. The pollutant concentrations in the liquid products increased by increasing the solid matter content of the raw sludge from 1 to 2%. This situation has been eliminated by the catalyst (KOH) addition, resulting in a very transparent liquid product. Additionally, TOC removal of 99.8% was obtained after addition of 2% catalyst. Thus, supercritical water gasification (SCWG) has been considered as a notable technology for the treatment and disposal of sewage sludge without the need of additional pre- or post-treatment. Graphic Abstract Aqueous wastes are treated efficiently High efficiency, short reac on me Small reactor volume and land area Clean liquid product Less solid product No toxic gas emission Eliminates pathogens
Keywords Supercritical water gasification · Municipal sewage sludge · Liquid product quality · Pilot scale reactor · KOH · Catalyst Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12649-019-00858-9) contains supplementary material, which is available to authorized users. * Elanur Adar [email protected]; [email protected] Mahir Ince [email protected] Mehmet Sinan Bilgili [email protected] 1
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Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400 Gebze, Kocaeli, Turkey
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Department of Environmental Engineering, Faculty of Civil Engineering, Yıldız Technical University, 34220 Esenler, İstanbul, Turkey
Department of Environmental Engineering, Faculty of Engineering, Artvin Coruh University, Seyitler Campus, 08100 Artvin, Turkey
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Statement of Novelty One of the sustainable disposal methods of sewage sludge is gasification under supercritical conditions (374 °C, 22.1 MPa). The effects of different operating conditions on liquid products have been determined by detailed analyzes. The study has determined both detailed properties of liquid products and h
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