Labscale Evaluation of Immobilization Media Final Report
نویسنده
چکیده
SUMMARY The performance of a 3-phase up-flow integrated high rate anaerobic digestion reactor system utilizing corn cob biochar as biofilm support was characterized at 10 liter total scale on waste trap grease wastewater at defined hydraulic retention times (HRT) and packing densities. Performance was evaluated in terms of chemical oxygen demand (COD) reduction, total volatile organic acid variability, and total suspended solids reduction, as well as headspace gas composition and production rate. High resolution images of biofilms revealed extensive biofilm coverage and microbial analysis of their underlying composition revealed evidence of broad populations of anaerobic bacteria that ferment organic substrates to produce acetate, ethanol, and hydrogen as major end products as well as archaeal populations that produce methane gas. Under conditions of a two day HRT and organic loading rate of 9.75 kg COD m-3 d-1 total and soluble COD reductions of 92 and95% were achieved with TSS reductions of 75%. The total volatile organic acids in the feed were almost completely digested and a total gas production rate of 6.1 m 3 m-3 d-1 was achieved with a methane composition of 73%.
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