Evaluation of Alkaline Chemical Addition and Organic Loading Schemes for Enhancement of Secondary Treatment and Ancillary Nutrient Removal.
Technical rept. Jan-Dec 81,
ARMY MEDICAL BIOENGINEERING RESEARCH AND DEVELOPMENT LAB FORT DETRICK MD
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Rotating biological contactor RBC units were operated as four-stage or single-stage processors at a hydraulic loading rate of 2.0 gpdsq 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 mgL. The single-stage RBC had dissolved oxygen concentrations ranging from 1.9 to 3.2 mgL. 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
- Water Pollution and Control