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Water Science & Technology Vol 63 No 9 pp 2004–2009 © IWA Publishing 2011 doi:10.2166/wst.2011.462 Wastewater as a resource: a unique approach to achieving energy sustainabilityP. M. Sutton, B. E. Rittmann, O. J. Schraa, J. E. Banaszak and A. P. TognaP. M. Sutton & Associates, Inc., 45 Bradford Lane, Enfield, NH 03748, USA E-mail: suttenv@aol.comCenter for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287-5701, USA Hydromantis, Inc., 1 James Street South, Suite 1601, Hamilton, ON L8P 4R5, Canada OpenCEL, 315 Park 2W, Glencoe, IL 60022, USA Envirogen Technologies Inc., 250 Phillips Blvd., Suite 255, Ewing, NJ 08618, USA ABSTRACT A wastewater-treatment flowsheet was developed to integrate uniquely designed biological processes with physical-chemical unit processes, allowing conversion of the organic carbon in the wastewater to methane, the removal and recovery of phosphorus and nitrogen from the wastewater, and the production of water suitable for reuse. In the flowsheet, energy is derived from the wastewater by first shunting a large fraction of the organic carbon in the wastewater to a solids slurry which is treated via anaerobic digestion. The anaerobic digestion system consists of focused pulsed (FP) pretreatment coupled to anaerobic membrane bioreactors (MBRs). Computer modelling and simulation results are used to optimize design of the system. Energy generation from the system is maximized and costs are reduced by using modest levels of recycle flow from the anaerobic MBRs to the FP pretreatment step. Keywords: anaerobic MBR; energy recovery; municipal wastewater treatment; solids pretreatment eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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