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A comparative pilot-scale evaluation of gas-sparged and granular activated carbon-fluidized anaerobic membrane bioreactors for domestic wastewater treatment
- Evans, Patrick J., Parameswaran, Prathap, Lim, Kahao, Bae, Jaeho, Shin, Chungheon, Ho, Jaeho, McCarty, Perry L.
- Bioresource technology 2019 v.288 pp. 120949
- biochemical oxygen demand, chemical oxygen demand, cost effectiveness, membrane bioreactors, municipal wastewater, permeability, sewage treatment, temperature, total suspended solids, ultrafiltration
- Two significantly different pilot-scale AnMBRs were used to treat screened domestic wastewater for over one year. Both systems similarly reduced BOD5 and COD by 86–90% within a 13–32 °C temperature range and at comparable COD loading rates of 1.3–1.4 kg-COD m−3 d−1 and membrane fluxes of 7.6–7.9 L m−2 h−1 (LMH). However, the GAC-fluidized AnMBR achieved these results at a 65% shorter hydraulic retention time than the gas-sparged AnMBR. The gas-sparged AnMBR was able to operate at a similar operating permeability with greater reactor concentrations of suspended solids and colloidal organics than the GAC-fluidized AnMBR. Also, the membranes were damaged more in the GAC-fluidized system. To better capture the relative advantages of each system a hybrid AnMBR comprised of a GAC-fluidized bioreactor connected to a separate gas-sparged ultrafiltration membrane system is proposed. This will likely be more effective, efficient, robust, resilient, and cost-effective.