Undergraduate Thesis Or Project
 

Gordon M final seminar.pptx

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  • Anaerobic digestion of lipid-extracted algal biomass has been proposed as a method to recover and recycle nutrients in algal biofuel systems. The purpose of this study was to quantify recoverable nitrogen and phosphorus from anaerobically digested C. vulgaris. Recoverable nutrients were deemed those present in the liquid phase of anaerobic digester effluents. Batch anaerobic digesters were constructed from 125 mL glass bottles with rubber septa lids. To investigate the necessity for co-digestion, waste activated sludge was digested with C. vulgaris comprising varying percentages of a constant substrate load (2070 mg VS L⁻¹). The waste activated sludge control produced significantly more biogas than the 100% lipid-extracted C. vulgaris treatment, with respective cumulative biogas yields of 657 and 408 mL g⁻¹ VS (85% CH₄). Reductions in biogas as concentrations of C. vulgaris increased correlated to a decline in recoverable nutrients. Of the total nutrients entering the anaerobic digesters, 34.1±5.9% of nitrogen and 13.2±3.0% of phosphorus were recovered from the 100% lipid-extracted treatment with corresponding nutrient concentrations at 446±19 ppm nitrogen and 48.5±11.8 ppm phosphorus. Ammonia inhibition was not observed, suggesting that co-digestion at this loading rate is not necessary to maintain digester performance.
  • Keywords: anaerobic, Chlorella vulgaris, co-digestion, lipid, biogas, waste activated sludge
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file details Gordon_M_final_seminar.pptx 2017-07-27 Público Descargar