Enhanced Leachate Recirculation at Dallas' McCommas Bluff Landfill

Termed the largest "recycling" project in Texas, the City of Dallas is currently developing a enhanced leachate recirculation (ELR) project at the McCommas Bluff Landfill (Landfill). As one of the largest municipal solid waste (MSW) landfills in the Country, it typically receives 7,000 tons of MSW per day and supports a 5-million cubic feet per day high-BTU landfill gas (LFG) processing facility. The landfill's enhanced waste degradation could result in the destruction of up to 40-percent of the in-situ waste volume; hence the largest "recycling" project. The City recently completed the permit stage for this project. In early 2008, the City will begin placement of waste in Cell 6, the first cell permitted for ELR. Installation and operation of the first lift of recirculation laterals and gas collectors will take place throughout 2008. Conceptual design factors include: 1 Bioreactor type (anaerobic, aerobic, or hybrid). 2 Leachate or added liquid pretreatment, storage, and delivery. 3 Liquid application methods. 4 Odor control. 5 Innovative LFG collection in wet waste. 6 Cover soils and liner design.