title: Aspergillus niger absorbs copper and zinc from swine wastewater.
abstract: Wastewater from swine confined-housing operations contains elevated levels of copper and zinc due to their abundance in feed. These metals may accumulate to phytotoxic levels in some agricultural soils of North Carolina due to land application of treated swine effluent. We evaluated fungi for their ability to remove these metals from wastewater and found Aspergillus niger best suited for this purpose. A. niger was able to grow on plates amended with copper at a level five times that inhibitory to the growth of Saccharomyes cerevisiae. We also found evidence for internal absorption as the mechanism used by A. niger to detoxify its environment of copper, a property of the fungus that has not been previously exploited for metal bioremediation. In this report, we show that A. niger is capable of removing 91% of the copper and 70% of the zinc from treated swine effluent.
authors.affiliation: Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616, USA.
authors.forename: M S
authors.initials: MS
authors.lastname: Price
authors.forename: J J
authors.initials: JJ
authors.lastname: Classen
authors.forename: G A
authors.initials: GA
authors.lastname: Payne
mesh_terms: D000818:Animals; D001234:Aspergillus niger / Q000378:metabolism*; D001673:Biodegradation, Environmental; D003300:Copper / Q000378:metabolism* / Q000493:pharmacokinetics; D004305:Dose-Response Relationship, Drug; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*; D014866:Waste Products; D015032:Zinc / Q000378:metabolism*
chemical_list: D014866:Waste Products; D003300:Copper; D015032:Zinc