Variations of trace metals in combustion chamber deposit in landfill gas engine a long period of time

• Published in: Journal of hazardous materials 2023-09, Vol.458, p.131880-131880, Article 131880
• Main Authors: Sevimoğlu, Orhan, Östürk Sömek, Özge
• Format: Article
• Language: English
• Subjects: Activated carbon treatment; Deposit composition; Elemental analysis; Landfill gas
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2023.131880

The combustion chamber deposit (CCD) is a major problem for the gas engines that formed accumulating of the metal oxides during the oxidation of trace compounds in the landfill gas (LFG). Therefore, the LFG was purified with activated carbon (AC) before in use to reduce deposit formation in gas engines. The AC treatment demonstrated the high removal capacity by reducing to below 1 % of the mass ratios of Si and Ca in the deposit. Unfortunately, the AC treatment caused the formation of black deposit in the intercooler that was analyzed by EDS and XRD. First time in this study, the variation of the elements of the CCD was comparatively investigated over a long period of time in 2010 and in 2019 without -AC treatment of LFG. The variation of the concentrations of C, Ca, N, S, Sb, Si- and Sn in the CCD were confirmed by the analysis with ICP-OES and SEM-EDS for 9-year period. It was determined with EDS analysis that while Sb and Sn were relatively low, C and N were high based on 2010. It has been determined that there is a proportional change depending on the time of the elements forming in the deposit. [Display omitted] •Activated carbon removes the organic compounds from the LFG but causing problems.•Intercooler deposit containing crystalline compounds was formed after AC treatment.•ICP-OES and SEM-EDS analyses were overlapped with determined elements.•Sb and Sn as major elements are heavy metal elements in the combustion deposit.