The mixture of sewage sludge and biomass waste as solid biofuels: Process characteristic and environmental implication. (August 2019)

• Record Type: Journal Article
• Authors: Chen, Jiacong; He, Yao; Liu, Jingyong; Liu, Chao; Xie, Wuming; Kuo, Jiahong; Zhang, Xiaochun; Li, Shoupeng; Liang, Jialin; Sun, Shuiyu; Buyukada, Musa; Evrendilek, Fatih
• Is Part Of: Renewable energy. Volume 139(2019)
• Page Start: 707
• Page End: 717
• Publication Date: 2019-08
• Subjects: Oxy-fuel (O2/CO2) -- Solid biofuels -- Synergistic effect -- TGA-MS -- XRF; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2019.01.119
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Oxy-fuel and air atmospheres were used to (co-)combust sewage sludge (SS) and biomass waste, coffee ground residues (CG) via thermogravimetric analysis (TGA). The combustion behavior of SS did not differ significantly in both atmospheres. The replacement of 79%N2 by 79%CO2 significantly influenced the char combustion of CG. Synergistic effect of the blends in the oxy-fuel was weaker than air condition. Activation energy of the co-combustion in the second stage was lower in the oxy-fuel than air atmosphere. The gaseous emissions during blend fuel combustion were investigated by online mass spectrometry (MS). Results show that the gas emissions of different fuels show different stage characteristics. CH3, H2 O, C2 H2 and NO emissions peaked from the volatiles combustion of CG, while the co-combustion led to SO2 increment. Besides, the composition of the solid residues was examined by X-ray fluorescence spectrometer (XRF), and their impact on environment was evaluated. The compositions of the solid residues pointed to the ability of SS to lower the fouling and slagging risks of CG. This investigation aimed to afford a fully understanding for the co-combustion progress of SS and CG under air and oxy-fuel environments and its implication for environment. Highlights: O2 /N2 and O2 /CO2 atmospheres were comparatively assessed for (co-)combustions. Positive synergistic effects were higher in the second than first stage of decomposition. The difference in E a in the atmospheres confirmed positive synergies. The gaseous products were identified using TG-MS. The slagging characteristics of ashes were determined using XRF.