Honors College Thesis
 

Hydrogel Immobilizations for Anammox Enrichment

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https://ir.library.oregonstate.edu/concern/honors_college_theses/b8515q55b

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  • Long delays in reactor startup due to high biomass washout have hindered the development of efficient and cost-effective wastewater treatments based on the anammox process. This can be remedied with efficient biomass retention systems. In the following study, anammox bacteria were successfully enriched in hydrogel immobilizations of polyvinyl alcohol (PVA) and calcium alginate (CA). Despite some biomass washout, a mixed-culture anammox immobilization in 2% CA produced similar activity to a packed-bed sludge reactor and had the highest activity of anammox of the gel immobilizations, achieving a maximum nitrogen removal rate of 1.0 mmol N/hr with 100% efficiency. Due to diffusion limitations in 10% PVA and 10% PVA:1% CA treatments, nitrogen removal achieved a maximum value of 0.4 mmol N/h with 60% efficiency. Modeling of an upflow packed-bed reactor with the modified Stover-Kincannon kinetics model yielded a Umax of 0.17 g N/L-day with a KB of 0.13 g N/L-day. Key Words: Alginate, Anammox, Hydrogel, Immobilization, Nitrogen Cycle, PVA
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