Rotating Biological Contactor Process for Secondary Treatment and Recarbonation Following Low-Level Lime Addition for Phosphorus Removal

摘要

This report describes phosphorus removal by low-level lime (pH 9.5) precipitation in the primary clarifier, followed by biological recarbonation using the rotating biological contactor (RBC). Of equal importance in this research effect was showing the enhancement of nitrification by the chemically induced increase in pH. The significance of combining physical and biological treatment of wastewaters was stressed. Goals were set to provide criteria for upgrading existing Army wasterwater treatment facilities to meet NPDES permit limitations, as opposed to research directed toward completely replacing such facilities. Considerations in research for design upgrade included maximum use of existing equipment and facilities, simplicity of operation and maintenance, and minimal laboratory support.