Accession Number : ADA141178

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

Descriptive Note : Technical rept. Jan-Dec 81,

Corporate Author : ARMY MEDICAL BIOENGINEERING RESEARCH AND DEVELOPMENT LAB FORT DETRICK MD

Personal Author(s) : Noss,C I

PDF Url : ADA141178

Report Date : Nov 1983

Pagination or Media Count : 27

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)

Descriptors :   *Water treatment, *Waste water, Carbon, Ammonia, Nitrogen, Removal, Oxygen, Concentration(Chemistry), Sodium hydroxide, Sodium carbonates, Calcium compounds, Hydroxides, Efficiency, Calcium oxides, Nitrification, Phosphorus, pH factor, Alkalinity

Subject Categories : Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE