Solid waste processing with pyrolysis of cellulosic waste
Waste, such as municipal solid waste (MSF), is separated into a wet fraction and refuse derived fuel (RDF). For example, the waste may be separated in a press. The wet fraction is treated in an anaerobic digester. The RDF is further separated into a cellulosic fraction and a non-cellulosic fraction. The cellulosic fraction is treated by pyrolysis and produces a pyrolysis liquid. The pyrolysis liquid is added to the anaerobic digester.
1. A process for treating solid waste comprising steps of,
separating the waste to produce rejects and a wet fraction;
separating cellulosic rejects from the rejects; and,
treating at least a portion of cellulosic rejects by anaerobic digestion.
2. The process of claim 1 further comprising co-digesting the wet fraction with the at least a portion of cellulosic rejects.
3. The process of claim 1 wherein the step of separating the waste comprises pressing the waste.
4. The process of claim 1 wherein the solid waste comprises municipal solid waste.
5. The process of claim 1 wherein the step of separating rejects comprises using an optical sorter.
6. The process of claim 1 further comprising a steps of: separating the waste to produce coarse screen overs; separating cellulosic material from the coarse screen overs; and digesting a portion of the cellulosic material.
7. The process of claim 6 wherein the portion of cellulosic material comprises pyrolysis liquid.
8. The process of claim 1 wherein the portion of cellulosic rejects comprises pyrolysis liquid.
9. The process of claim 1 , wherein the step of separating the waste to produce rejects and a wet fraction comprises separating the waste to produce coarse screen unders and separating the coarse screen unders to produce rejects and a wet fraction.