Research Article
Jun 1975
Lime Recovery and Reuse in Primary Treatment
Authors: Denny S. Parker, AM.ASCE, Geoffrey A. Carthew, AM.ASCE, and Gerry A. Horstkotte, F.ASCEAuthor Affiliations
Publication: Journal of the Environmental Engineering Division
Volume 101, Issue 6
Abstract
Dosing lime to municipal wastewater prior to primary sedimentation tanks and the subsequent recovery, classification and recalcining of the primary sludge which is rich in calcium carbonate, was studied in detail by monitoring a 1,500,000 gpd test facility in Contra Costa County, California. A definite improvement in primary treatment performance occurs when the recalcined lime is introduced to the sewage flow, compared to the performance achieved when only virgin lime is used in the process. Primary phosphorus removals averaged 96% when steady-state recycle was established, with average BOD removals of 73% and suspended solids removals of 92%. Continued recycle of the lime causes a buildup in inert fractions such as silica, which are partially removed by a dry classification of the recalcined material. Close agreement was obtained between the observed solids constituent levels and the levels calculated by a specially designed mathematical model of the lime recycling process.
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Information
Published In
Journal of the Environmental Engineering Division
Volume 101 • Issue 6 • June 1975
Pages: 985 - 1004
Copyright
© 1975 American Society of Civil Engineers.
History
Published in print: Jun 1975
Published online: Feb 11, 2021
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Authors
Affiliations
Denny S. Parker, AM.ASCE
Project Mgr., Brown and Caldwell, Walnut Creek, Calif.
Geoffrey A. Carthew, AM.ASCE
Project Engr., Caldwell Connell Engrs., Melbourne, Australia
Gerry A. Horstkotte, F.ASCE
General Mgr.-Chf. Engr., Central Contra Costa Sanitary District, Walnut Creek, Calif.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.