Reuse of water treatment residuals from lime softening, Part I: Applications for the reuse of lime sludge from water softening

J (Hans) van Leeuwen; David J White; Rob J Baker; Christopher Jones

doi:10.2462/09670513.1012

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Reuse of water treatment residuals from lime softening, Part I: Applications for the reuse of lime sludge from water softening

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Reuse of water treatment residuals from lime softening, Part I: Applications for the reuse of lime sludge from water softening

J (Hans) van Leeuwen, David J White, Rob J Baker and Christopher Jones

Land contamination & reclamation, Vol.18(4), pp.393-415

Iowa State University Digital Repository

2011

DOI: 10.2462/09670513.1012

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https://dr.lib.iastate.edu/handle/20.500.12876/13753View

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Abstract

Lime sludge, an inert material mostly composed of calcium carbonate, is the result of softening hard water before distribution as drinking water. A large city such as Des Moines, Iowa, produces about 32 000 tons of lime sludge (dry-weight basis) annually. This is about half of the lime sludge produced in Iowa per year in eight different cities, and these cities currently have 371 800 tons (dry-weight basis) stockpiled. The Iowa Department of Natural Resources directed those cities using lime softening in drinking-water treatment to stop digging new lagoons to dispose of lime sludge. The situation in surrounding Midwestern states is similar, and there will be millions of tons of lime sludge in stockpiles. Five Iowa water-treatment plants, all producers of lime sludge, funded the research. The research goal was to find useful and economical alternatives for the disposal of lime sludge. Feasibility studies tested the efficacy of using lime sludge in cement production, power-plant SOx control, dust control on gravel roads, wastewater neutralization, and infill materials for road construction. All the potential applications were demonstrated to be at least feasible, except for dust control. Fill material from admixture with fly ash showed the most promise as a bulk, if variable, demand application.

Environmental Engineering

Bioresource and Agricultural Engineering

cement

dust control

lime sludge

neutralization

power plant

SOx control

stockpiling

water treatment residuals

Details

Title: Subtitle: Reuse of water treatment residuals from lime softening, Part I: Applications for the reuse of lime sludge from water softening
Creators: J (Hans) van Leeuwen - Iowa State University
David J White - Iowa State University
Rob J Baker
Christopher Jones
Resource Type: Website
Publication Details: Land contamination & reclamation, Vol.18(4), pp.393-415
Publisher: Iowa State University Digital Repository
DOI: 10.2462/09670513.1012
ISSN: 0967-0513
eISSN: 2053-7786
Language: English
Date published: 2011
Academic Unit: IIHR--Hydroscience and Engineering
Record Identifier: 9984752758902771

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