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):

Report Date:

1983-11-01

Pagination or Media Count:

27.0

Abstract:

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

Subject Categories:

  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE