Efficiency in Wastewater Treatment in North America: A - download pdf or read online

By George Crawford

ISBN-10: 1843393972

ISBN-13: 9781843393979

After manpower, strength is the top working expense merchandise for many the wastewater utilities. over the past decade, the implementation of recent applied sciences to fulfill new effluent limits and water caliber criteria has significantly elevated power intake by means of the sphere. the cost of power has additionally considerably elevated within the similar interval. In North the USA and Europe, a few utilities have pronounced major raises in strength charges in recent times, and with oil costs carrying on with to range, additional large raises in working bills should be anticipated. these raises should be compounded through the necessity to meet extra new rules that would require energy-intensive remedy approaches to accomplish tight criteria. excessive power intake will have an effect on the wastewater world wide and is inextricably associated with the difficulty of weather switch. via its Optimization problem software, the Water setting examine beginning (WERF) is presently partaking within the international Water learn Coalition's (GWRC) undertaking titled power potency within the Water undefined: A Compendium of most sensible Practices and Case reports. the target of the GWRC venture is to improve a Compendium of top perform (worldwide) within the energy-efficient layout and operation of water resources. For this undertaking, WERF is serving the position of North the USA wastewater perform coordinator. via this task, WERF intends to outline particular suggestions concerning: * Incremental advancements in power potency via optimization of present resources and operations * extra enormous advancements in power potency from the adoption of novel (but confirmed at complete scale) applied sciences As a part of the GWRC venture, WERF has constructed this record summarizing latest info on well-established power optimization/energy restoration top practices, in addition to documenting a chain of case reports of novel (yet full-scale confirmed) technologies/practices in wastewater remedy in essentially North the US

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Example text

One group of methanogens uses hydrogen and carbon dioxide to produce CH4; a second group catalyzes the cleavage of acetate to produce CH4 and CO2.

Anaerobic digestion traces its roots to the 1850s and is one of the oldest forms of wastewater treatment (Tchobanoglous and Burton, 1991). S. The primary purpose of anaerobic digestion in these plants is the stabilization of organic matter to CH4 and CO2, with concurrent reductions in odors, pathogens, and solid material requiring disposal (Parkin and Owen, 1986; Speece, 1996; Rittmann and McCarty, 2001). Unlike aerobic biological reactions, which can be performed by a single species of bacteria, the anaerobic digestion process requires a complex consortium of microbial species, including facultative and obligate anaerobes, each performing a distinct role in the overall conversion of organic material to CH4 and CO2.

Speed reduction occurs, however, without the requirement for a VFD. This limits the application of wound rotor motors to special Energy Efficiency in Wastewater Treatment in North America 2-13 applications, such as hoists and cranes, which require high starting torques and intermittent operation. Because synchronous motors apply direct current to the rotor, slip does not occur, and the rotor follows the magnetic field developed in the stator. This limits the torque that can be developed, requiring special starting mechanisms.

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Efficiency in Wastewater Treatment in North America: A Compendium of Best Practices and Case Studies of Novel Approaches by George Crawford

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