Replacement of used fossil fuels (petroleum coke) by household waste (case of the Oum Azza landfill). 1,682.1. 203.7. 6.0. 17. Valorisation of olive pomace. Replacement of used fossil fuels (petroleum coke) with olive pomace. 1,159.5. 108.5. 0.0. 18. Valuation of fly ash.