A Proposed Treatment System for the Remediation of Landfill Leachate Using Algae Public

http://ir.library.oregonstate.edu/concern/honors_college_theses/zw12z720w

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  • Landfill leachate is a complex wastewater that contains high levels of ammonium (often over 250 ppm) and trace heavy metals (usually under 0.2 ppm). Microalgae have been shown to inexpensively and effectively treat wastewaters containing high loads of organics and nutrients, as well as adsorb metal ions. This thesis focuses on designing a treatment system for landfill leachate using a combination of algal and traditional water treatment methods for economical and reliable remediation of leachate. Scenedesmus dimorphus was grown in low dilutions of pretreated and untreated leachate to test the viability of this species for leachate treatment. Higher dilutions were not tested due to light limitation concerns. Pretreatment consisted of filtration through dried brown macroalgae Ascophyllum nodosum and distillation to reduce ammonia concentration. Nitrogen concentration and algal density were monitored using a Hach assay kit and hemocytometer cell counts, respectively. Nitrogen removal was expected in all samples, but assay results were inconclusive due to a lack of duplicate assays. S. dimorphus grew to over 5 times the original concentration within 5 days in dilutions of 5, 10, 15, and 20% untreated leachate in growth media. With adequate pretreatment and dilution, S. dimorphus shows potential for use in an algal bioreactor to treat landfill leachate.
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