PROBLEM TO BE SOLVED: To provide a waste regeneration treatment system and a waste regeneration treatment method capable of easily treating foaming agent separated from resin form at low cost.SOLUTION: A waste regeneration system according to an embodiment includes: a crusher for foamable resin waste; a granulation treatment section for foamable resin powder; and a foaming agent treatment section treating foaming agent gas separated by the crusher and the granulation treatment section. A granulation device in the granulation treatment section includes: a die; an introduction section introducing the foamable resin powder to the die; and a discharge section to which pellets are discharged from the die. The foaming agent gas from the crusher is fed to the discharge section, and the foaming agent gas from the introduction section is introduced into a gas line in rear of the discharge section.
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