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The problem of urban waste is one of the most complicated problems in Indonesia's big cities. Utilizing municipal waste into co-firing fuel is one way to reduce waste that accumulates and reduce global emissions. Before being used, the urban waste needs to be tested for characteristics to determine its content or its combustion characteristics. This study uses Indonesian low-rank and medium-rank coal and Solid Recovered Fuel (SRF) biomass. This observation aims to decide the effect of coal-SRF blended on slagging and fouling in cofiring using a drop tube furnace (DTF). The results obtained are SRF blending up to 15% there is no slag attached. There is slight slag attached at the blending ratio of 20% and 25%, and there is a corroded part of the plate. It can happen because SRF has a high chlorine content. Overall, it shows that co-firing coal with SRF up to 25% is still safe on slagging and fouling.

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The use of biodiesel could affect the characteristic of elastomers. It may cause swelling degradation of strength and hardness of the elastomers. In this research, the influence of B30 palm-based biodiesel blends upon degradation of elastomers was investigated, especially elastomers used in the industrial gasket or seal materials, including ethylene propylene diene monomer (EPDM) and fluoroelastomer. The tests were carried out by immersing the elastomers in static B30 (30% biodiesel in diesel) at room temperature (27 – 30 oC) for 1007 h. The elastomeric strength was tested physically by measuring the swelling of mass and volume, hardness, and tensile strength at the 71, 167, 671, and 1007 h immersion time. The results show that fluoroelastomer has a more negligible degradation effect than ethylene propylene diene monomer (EPDM).

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