Processing and gasification of construction and demolition materials

A system for gasifying construction and demolitions materials, the system comprising:

• a source of C&D feed (i) a composition including arsenic, chromium, and/or boron, and (ii) at least two of untreated wood, treated wood, paper, cardboard, yard waste, plastic, rubber, or foam;
• an inlet portion including a solids feed hopper configured to receive the C&D feed, and a rotatable feeder positioned to receive the C&D feed from the solids feed hopper, wherein the rotatable feeder includes an inlet end and an opposing outlet end and is configured to transport the C&D feed away from the inlet end and toward the outlet end;
• a gasifier fluidically coupled to the inlet portion and positioned to receive the C&D feed from the outlet end of the rotatable feeder at a first portion of the gasifier, the gasifier further comprising a second portion spaced apart from the first portion in a first direction, and a third portion spaced apart from the first portion in a second direction opposite the first direction, wherein:
• the second portion is configured to receive steam and oxygen and the third portion includes a gasifier head,
• the gasifier includes only (i) a first inlet configured to receive the steam and oxygen and (ii) a second inlet configured to receive the C&D feed,
• the gasifier is configured to operate at a temperature of no more than 950° C. and a pressure of no more than 200 pounds per square inch (psi) to produce syngas at the gasifier head, and
• the gasifier is configured to produce a first ash comprising arsenic, chromium, boron, and/or sulfur;
• a source of capture material fluidically couple an outlet of the gasifier, wherein the capture material comprises particles having a particle size of 250-400 mesh;
• and
• a filter vessel comprising a filter fluidically coupled to an outlet of the gasifier and configured to remove heavy metals from the produced syngas, wherein the filter vessel is positioned to receive the produced syngas from the gasifier head, wherein the source of material is upstream of the filter, and wherein, in operation, the filter vessel removes heavy metals from the produced syngas and produces a second ash comprising at least some of the removed heavy metals.

A system for gasifying construction and demolition materials, the system comprising:

• a source of C&D feed comprising chromated copper arsenate (CCA) wood, borate-treated materials, and/or resinated wood;
• an inlet portion including a solids feed hopper configured to receive the C&D feed, and a rotatable feeder downstream of the solids feed hopper, wherein the rotatable feeder includes an inlet end and an opposing outlet end and is configured to transport the C&D feed away from the inlet end and toward the outlet end;
• a gasifier fluidically coupled to the outlet end of the rotatable feeder and positioned to receive the C&D feed at an intermediate portion of the gasifier, the gasifier comprising a lower portion configured to receive steam and oxygen and an upper portion including a gasifier head, wherein the gasifier includes only (i) a first inlet configured to receive the steam and oxygen and (ii) a second inlet configured to receive the C&D feed;
• a source of capture material fluidically coupled to an outlet of the gasifier, wherein the capture material comprises particles having a particle size of 250-400 mesh;
• and
• a filter fluidically coupled to an outlet of the gasifier and positioned to receive the syngas, wherein the filter is configured to remove undesirable contaminants from the syngas and produce an ash comprising chromium, arsenic and/or boron, and wherein the source of capture material is upstream of the filter.