41 339.7. 8,078.8. 4,255.5. 14. Cement. Recycling of used tires. Replacement of used fossil fuels (petroleum coke) with used tires. 3,730.2. 337.9. N / A. 15. Recovery of WWTP sludge. Replacement of used fossil fuels (petroleum coke) by WWTP sludge. 375.1. 36.0. 1.5. 16. Recycling of household waste. Replacement of used fossil fuels (petroleum coke) by household waste (case of the Oum Azza landfill). 1,682.1. 203.7. 6.0. 17.