Research Article
Apr 1982
Rotating Biodisks Recarbonate Alkaline Wastewater
Publication: Journal of the Environmental Engineering Division
Volume 108, Issue 2
Abstract
Lime addition to raw wastewater as an upgrading technique can significantly aid a rotating biological contactor (RBC) plant in producing effluents in compliance with federal discharge permit limitations for biochemical oxygen demand (BOD5), amonia nitrogen and phosphorus. Low-level lime addition does not require recarbonation and does not produce the sludges typical of high pH lime treatment schemes. The pilot RBC process provided BOD5 removal when subjected to an influent pH of 9.5 for hydraulic loading rates of 2.0, 3.0, and 4.0 gpd/sq ft (0.08, 0.12, and 0.6m³/m²⋅ day). In addition to the removal of phosphorus, lime pretreatment reduced the organic loading on the RBC process and allowed for recarbonation by microbial populations which produced carbon dioxide, thereby forming carbonate alkalinity necessity for nitrification after the initial BOD5 had been removed. The resultant pH after recarbonation was also in the optimal range for nitrification.
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Information
Published In
Journal of the Environmental Engineering Division
Volume 108 • Issue 2 • April 1982
Pages: 339 - 348
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Apr 1982
Published online: Feb 11, 2021
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Authors
Affiliations
Charles I. Noss
Research Engr., U. S. Army Medical Bioengineering Research and Development Lab., Ft. Detrick, Frederick, Md. 21701
Roy D. Miller, M.ASCE
Chf., Environmental Health Engrg. Branch, U. S. Army Environmental Hygiene Agency, Regional Division-North, Fort Meade, Md. 20755
Edgar D. Smith, M.ASCE
Environmental Engr., U.S. Army Construction Engrg. Research Lab., Champaign, Ill. 61820
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