A method for processing mixed solid waste, comprising: providing a mixed waste stream comprising at least 10 wt% wet organic waste having a density greater than 192 kg/m 3 (12 Ib/cu-ft) and less than 2242 kg/m 3 (140 Ibs/cubic foot) and at least 10 wt% dry organic waste with a density less than 192 kg/m 3 (12lb/cu-ft) and greater than 16 kg/m 3 (1.0 Ib/cubic foot), wherein the wet organic waste and dry organic waste are comingled; separating the wet organic waste from the dry organic waste by size and density using at least two mechanical separators including a size separator and a density separator to produce an intermediate wet organic stream enriched in wet organic waste and an intermediate dry organic stream enriched in dry organic waste, wherein the separating includes sizing the mixed waste to produce at least one sized waste stream with a lower cutoff size greater than 5.08 cm (2 inches) and an upper cutoff less than 45.72 cm (18 inches) and a ratio of the upper cutoff to lower cutoff is less than 6, and the sized waste stream is separated by density using the density separator; converting at least a portion of the intermediate wet organic stream to one or more of a renewable fuel product, a soil amendment, a liquid fertilizer, a compost, energy, or a combination thereof using at least a first conversion technique; and converting the intermediate dry organic stream to one or more of a renewable fuel product, a chemical compound product, energy, or a combination thereof using at least a second conversion technique, wherein the second conversion technique is different than the first conversion technique. providing a mixed waste stream comprising at least 10 wt% wet organic waste having a density greater than 192 kg/m 3 (12 Ib/cu-ft) and less than 2242 kg/m 3 (140 Ibs/cubic foot) and at least 10 wt% dry organic waste with a density less than 192 kg/m 3 (12lb/cu-ft) and greater than 16 kg/m 3 (1.0 Ib/cubic foot), wherein the wet organic waste and dry organic waste are comingled; separating the wet organic waste from the dry organic waste by size and density using at least two mechanical separators including a size separator and a density separator to produce an intermediate wet organic stream enriched in wet organic waste and an intermediate dry organic stream enriched in dry organic waste, wherein the separating includes sizing the mixed waste to produce at least one sized waste stream with a lower cutoff size greater than 5.08 cm (2 inches) and an upper cutoff less than 45.72 cm (18 inches) and a ratio of the upper cutoff to lower cutoff is less than 6, and the sized waste stream is separated by density using the density separator; converting at least a portion of the intermediate wet organic stream to one or more of a renewable fuel product, a soil amendment, a liquid fertilizer, a compost, energy, or a combination thereof using at least a first conversion technique; and converting the intermediate dry organic stream to one or more of a renewable fuel product, a chemical compound product, energy, or a combination thereof using at least a second conversion technique, wherein the second conversion technique is different than the first conversion technique.