Water/Wastewater Engineering Report (High Efficiency Pump/Motor Replacement - M2 Model)

This report presents the methodology used to develop the high efficiency pump/motor model (M2) for wastewater treatment and water treatment plant. It reviews the engineering equations that were used to develop the model. It also includes a detailed description of an example to illustrate the methodology.Pumping water or wastewater is the largest use of electricity for a municipal water supply or wastewater treatment plant. Increasing the overall efficiency of the pumping system can achieve significant energy savings. Overall pump system efficiency depends on the efficiency of the motor, the pump, and the design of the piping layout. The model developed in this document focuses on improvements mostly to the pumping system rather than a municipal piping system. Furthermore, this model primarily addresses electric motor-driven pumps, and does not include the pumps driven with gasoline or diesel engines.Texas Senate Bill 5; Texas Commission in Environmental Qualit

Water/Wastewater Engineering Report (Storm Sewer/Infiltration Sanitary Sewage Separation-M1 Model)

In this document, a statistical methodology for calculating the savings from the storm water/infiltration sanitary sewage separation (i.e., the “M1 model”) is presented. This method uses ASHRAE’s Inverse Model Toolkit (IMT) for the weather-normalization analysis. This document provides a review of the ASHRAE IMT, a description of the M1 model, and provides an example to illustrate the methodology.In some cities, the municipal sewer system collects both storm water and sanitary sewage in the same pipes. During dry weather these sewers carry all the sanitary sewage to the wastewater treatment plant for treatment. However, when rainstorms or snow melt increase the amount of runoff, the combined flow of sanitary sewage and storm water can exceed the capacity of the sewer system, which can cause serious problems like the storm water and sewage mix are discharged untreated into the river or the sewage backs up into streets and basement. Storm water treated in the sewage treatment plant also causes unnecessary energy use. Sewer systems can also have unintended ground water entering the network, which occurs because of hydraulic pressure on the buried sewer lines infiltration. Therefore, separating the storm water/infiltration and sanitary sewage reduces the possibility of sewage discharge during heavy rain periods, and saves energy.Texas Senate Bill 5; Texas Commission on Environmental Qualit

Development of a Web-Based, Emissions Reduction Calculator for Storm Water/Infiltration Sanitary Sewage Separation

This paper presents the procedures developed to calculate the electricity savings and emissions reductions from the infiltration of storm water into sanitary sewage separation using a two-step regression method: one step to correlate the gallons of wastewater treated to the rainfall, and a second step that correlates the gallons of wastewater treated to the electricity consumed during a given period. The procedure integrates ASHRAE's Inverse Model Toolkit (IMT) for the weather-normalization analysis and the EPA's Emissions and Generations Resource Integrated Database (eGRID) for calculating the NOx emissions reductions for the electric utility provider associated with the user