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pH, Dissolved Oxygen, and Adsorption Effects on Metal Removal in Anaerobic Bioreactors

Colorado School of Mines, Division of Environmental Science and Engineering, Coolbaugh Hall, Golden, CO 80401

View larger version (29K): [in a new window]   Fig. 1. Wet-substrate bioreactor system design. Reactors A1 and A2 had an operating substrate bed volume of 29 L. Reactors B1 and B2 had volumes of 25 L.

View larger version (30K): [in a new window]   Fig. 2. Experimental reactor design.

View larger version (31K): [in a new window]   Fig. 3. Metal and sulfate removal rates as a function of hydraulic detention time.

View larger version (20K): [in a new window]   Fig. 4. Comparison of sulfate removal average with metal removal as a function of hydraulic detention time. The sulfate removal average line remained constant with respect to hydraulic detention time.

View larger version (20K): [in a new window]   Fig. 5. Comparison of sulfate removal with metal removal as a function of hydraulic detention time for the acidic/reduced dissolved oxygen drainage experiment. The sulfate removal line has decreased from that observed in the circumneutral pH drainage experiment.

View larger version (14K): [in a new window]   Fig. 6. Removal of dissolved copper ions from a 1-L solution containing 10 g of composted livestock manure.

View larger version (16K): [in a new window]   Fig. 7. Adsorption reactor effluent concentration (C/C0) vs. volume of influent passed. Manganese is the first constituent metal to appear in the effluent.