Emerging Tech for Wastewater Treatment

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Emerging Tech for Wastewater Treatment ( emerging-tech-wastewater-treatment )

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Chapter 6 Energy Conservation Measures 6.1 Introduction Energy consumption for municipal wastewater treatment accounts for 15% to 30% of the operating cost at large treatment facilities and 30% to 40% at small facilities (WEF, 2009). Energy is required throughout the wastewater treatment process and facilities, with aeration, pumping and solids management operations typically accounting for the greatest share of a utility’s energy use. The demand and cost of this energy to a wastewater utility continues to rise due to a number of factors including:  Implementation of increasingly stringent discharge requirements.  Enhanced treatment of biosolids, including drying and pelletizing.  Higher pumping and treatment requirements and costs associated with increased infiltration and inflow from aging wastewater collection systems.  Increasing electricity rates associated with the cost of fossil fuels used for energy production and with construction of new electric power generating and distribution infrastructure to meet increasing demand. As a consequence of rising energy demand and costs, many wastewater facilities have developed energy management strategies and implemented energy conservation measures (ECMs) to reduce their energy consumption and costs as well as reduce their carbon footprint and associated greenhouse gas emissions. ECMs are herein defined as energy efficient equipment retrofits, operational modifications, and process control enhancements whose implementation leads to reduced energy consumption and costs and often, improved treatment efficiency. This chapter focuses on the advances in ECMs used at wastewater facilities, particularly those that have been developed and implemented since 2008. Other ECMs and energy conservation approaches are discussed in “Evaluation of Energy Conservation Measures for Wastewater Treatment Facilities” (EPA 832-R-10-005). 6.2 Technology Assessment A summary of several innovative, emerging and established ECMs is provided in Table 6.1. Individual technology summary sheets with performance and cost/savings* information are included for several innovative and emerging ECMs documented in the literature. (* Capital costs shown in this chapter may include other needed facilities and/or ancillary equipment needed to implement the ECM and may have been derived from the total cost of a larger project. In some cases, installation costs may not be available and not be included. Capital and O&M costs as well as energy savings are site specific and equipment specific and can vary significantly. For details on the basis of some of the reported costs, please consult the EPA Wastewater Treatment and In-Plant Wet Weather Management 6-1

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