Evaluation of Alkaline Chemical Addition and Organic Loading Schemes for Enhancement of Secondary Treatment and Ancillary Nutrient Removal.

Abstract

Rotating biological contactor (RBC) units were operated as four-stage or single-stage processors at a hydraulic loading rate of 2.0 gpd/sq ft. The removal of total organic carbon (TOC) and ammonia nitrogen was similar in all operational configurations. The biomass was thick and gray in the first stage of the four-stage RBC and corresponded to a dissolved oxygen concentration ranging from 0.6 to 1.2 mg/L. The single-stage RBC had dissolved oxygen concentrations ranging from 1.9 to 3.2 mg/L. When RBC units were operated on wastewaters containing sodium hydroxide, sodium carbonate, and calcium hydroxide at pH 9.5, the processes receiving sodium salts operated at reduced efficiency as compared to a control. The RBC unit receiving lime-pretreated wastewater removed more TOC than the control unit. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1983
Accession Number
ADA141178

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  • C. I. Noss

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  • United States Army Medical Research and Development Command

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