Presentation Title

Thermal-Economic Analysis of Using Reverse Osmosis Concentrate for Thermal Energy Storage

Faculty Mentor

Dr. Reza Baghaei Lakeh

Start Date

23-11-2019 12:45 PM

End Date

23-11-2019 1:00 PM

Location

Markstein 105

Session

oral 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

Reverse Osmosis (RO) is widely used as a water treatment technique to desalinate seawater and surface water into potable water. The undesired byproduct of this RO process is Reverse Osmosis Concentrate (ROC), a highly toxic saline solution. Current ROC disposal methods include surface seawater discharge, sewer discharge, and deep injection wells; however, these methods are harmful to the marine environment. In response, the Environmental Protection Agency levies a high tax for ROC disposal. Thus, RO desalination plants have begun to repurpose the ROC to mitigate costs. The repurposed ROC is used for pure salt applications, heavy metal extractions, and many other engineering applications.

In this project, the repurposed ROC was studied as a storage medium for grid-scale Thermal Energy Storage (TES) systems. Currently, desalination plants are expensed for ROC disposal providing a financial incentive for it to be used in reducing the total cost per kilowatt-hour ($/kWh) for TES systems. The Department of Energy’s goal is to reduce the Levelized Cost of Energy of TES for concentrated solar power to be under 15 $/kWh by 2030, known as the Sunshot Initiative. To approximate the $/kWh of the proposed system, the ROC properties were researched to verify the economic feasibility and effectiveness of the system. The overall cost for energy storage took into consideration transportation, evaporation, grinding, and containment costs while considering a positive financial gain from obtaining the ROC. Lastly, various TES configurations were analyzed to compare the heat transfer effectiveness and relative costs per unit. By using the property values verified through research and experimentation from previous years, the results show a financial benefit using ROC as a storage medium for TES. The optimized configuration shows that the application of TES using ROC is feasible to meet the Sunshot Initiative.

This document is currently not available here.

Share

COinS
 
Nov 23rd, 12:45 PM Nov 23rd, 1:00 PM

Thermal-Economic Analysis of Using Reverse Osmosis Concentrate for Thermal Energy Storage

Markstein 105

Reverse Osmosis (RO) is widely used as a water treatment technique to desalinate seawater and surface water into potable water. The undesired byproduct of this RO process is Reverse Osmosis Concentrate (ROC), a highly toxic saline solution. Current ROC disposal methods include surface seawater discharge, sewer discharge, and deep injection wells; however, these methods are harmful to the marine environment. In response, the Environmental Protection Agency levies a high tax for ROC disposal. Thus, RO desalination plants have begun to repurpose the ROC to mitigate costs. The repurposed ROC is used for pure salt applications, heavy metal extractions, and many other engineering applications.

In this project, the repurposed ROC was studied as a storage medium for grid-scale Thermal Energy Storage (TES) systems. Currently, desalination plants are expensed for ROC disposal providing a financial incentive for it to be used in reducing the total cost per kilowatt-hour ($/kWh) for TES systems. The Department of Energy’s goal is to reduce the Levelized Cost of Energy of TES for concentrated solar power to be under 15 $/kWh by 2030, known as the Sunshot Initiative. To approximate the $/kWh of the proposed system, the ROC properties were researched to verify the economic feasibility and effectiveness of the system. The overall cost for energy storage took into consideration transportation, evaporation, grinding, and containment costs while considering a positive financial gain from obtaining the ROC. Lastly, various TES configurations were analyzed to compare the heat transfer effectiveness and relative costs per unit. By using the property values verified through research and experimentation from previous years, the results show a financial benefit using ROC as a storage medium for TES. The optimized configuration shows that the application of TES using ROC is feasible to meet the Sunshot Initiative.