Science Inventory

Water Utility Lime Sludge Reuse – An Environmental Sorbent for Power Utilities

Citation:

Patterson, C., S. Dastgheib, H. Salih, AND M. Elovitz. Water Utility Lime Sludge Reuse – An Environmental Sorbent for Power Utilities. In Proceedings, AWWA WQTC, Indianapolis, IN, November 13 - 17, 2016. American Water Works Association, Denver, CO, (2016).

Impact/Purpose:

Huge amounts of lime sludge waste, generated from hundreds of water treatment utilities across the U.S., is currently disposed in landfills. This project evaluated a sustainable and economically-attractive approach to the use of lime sludge waste as a valuable resource for power generation utilities.

Description:

Lime sludge can be used as an environmental sorbent to remove sulfur dioxide (SO2) and acid gases, by the ultra-fine CaCO3 particles, and to sequester mercury and other heavy metals, by the Natural Organic Matter and residual activated carbon. The laboratory experimental set up included a simulated flue gas preparation unit, a lab-scale wet scrubber, and a mercury analyzer system. The influent mercury concentration was based on a range from 22 surveyed power plants. The reactivity of the lime sludge sample for acid neutralization was determined using a method similar to method ASTM C1318-95. Similar experiments were conducted using reagent calcium carbonate and calcium sulfate to obtain baseline data for comparing with the lime sludge test results. The project also evaluated the techno-economic feasibility and sustainable benefits of reusing lime softening sludge. If implemented on a large scale, this transformative approach for recycling waste materials from water treatment utilities at power generation utilities for environmental cleanup can save both water and power utilities millions of dollars.

URLs/Downloads:

http://www.awwa.org/conferences-education/conferences/water-quality-technology/water-quality-program.aspx   Exit

Record Details:

Record Type: DOCUMENT (PAPER IN NON-EPA PROCEEDINGS)
Product Published Date: 11/16/2016
Record Last Revised: 12/22/2016
OMB Category: Other
Record ID: 334251

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

WATER SUPPLY AND WATER RESOURCES DIVISION

WATER QUALITY MANAGEMENT BRANCH