title: Effect of moisture control and air venting on H2S production and leachate quality in mature C&D debris landfills.
abstract: The effect of air venting and moisture variation on H2S production and the leaching of metals/metalloids (arsenic, copper, chromium, and boron) from treated wood in aged mature construction and demolition (C&D) debris landfills were examined. Three simulated C&D debris landfill lysimeters were constructed and monitored, each containing as a major debris component either wooden pallets, chromated copper arsenate (CCA) treated wood, or alkaline copper quaternary (ACQ) treated wood. The lysimeters were operated with alternating periods of water addition (a total of 160 L in four equal amounts) and air venting (68.4 m(3)per day for 121 days in two phases). Moisture addition did not increase H2S levels in the long term, and a significant drop in H2S concentration was observed (up to 99%) when aerobic conditions were promoted through air venting. H2S concentrations increased after venting stopped up to values approximately two orders of magnitude lower than observed prior to venting. Venting had the immediate consequence of suppressing biological H2S production, and the longer-term effect of decreasing organic matter that could otherwise be utilized in this process. Under aerobic conditions, the levels of arsenic, chromium, and boron in leachate decreased up to 96%, 49%, and 68%, respectively, while copper was found to increase up to 200% in CCA and 445% in ACQ column leachates.
authors.affiliation: Department of Environmental Engineering Sciences, University of Florida , P.O. Box 116450 Gainesville, Florida 32611-6450, United States.
authors.forename: Jianye
authors.initials: J
authors.lastname: Zhang
authors.forename: Brajesh
authors.initials: B
authors.lastname: Dubey
authors.forename: Timothy
authors.initials: T
authors.lastname: Townsend
mesh_terms: D000388:Air; D057919:Biological Oxygen Demand Analysis; D003252:Construction Materials; D006813:Humidity; D006862:Hydrogen Sulfide / Q000032:analysis*; D008670:Metals / Q000032:analysis; D013440:Sulfides / Q000032:analysis; D013997:Time Factors; D014691:Ventilation; D064091:Waste Disposal Facilities; D014866:Waste Products / Q000032:analysis*; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D013440:Sulfides; D014866:Waste Products; D014874:Water Pollutants, Chemical; D014867:Water; D006862:Hydrogen Sulfide