Nitrogen removal for on-site sewage disposal. Field evaluation of buried sand filter/greywater systems
Date of Original Version
The nitrogen removal associated with buried sand filter/greywater systems, patterned after RUCK system designs, was assessed in a field laboratory and two fullscale systems in Rhode Island. Specifically, the study tested the ability of buried sand filters to support nitrification and the suitability of household greywater as a carbon source for denitrification. The buried sand filter/greywater systems removed approximately 50% of the total nitrogen in household wastewater before the wastewater entered the soil absorption field. Nitrification within the buried sand filters was a major limiting factor to complete nitrogen removal, with filters generally providing 50-80% nitrification. Denitrification rates of 100% were routinely observed using greywater as a carbon source and a rock tank with a three day retention period as an anaerobic environment. Rock-free tanks with a one day retention period were also assessed as an anaerobic environment, providing an average of 74% denitrification. Buried sand filter/greywater systems show promise as a nitrogen removal system for on-site sewage disposal.
Publication Title, e.g., Journal
Transactions of the American Society of Agricultural Engineers
Lamb, B. E., A. J. Gold, G. W. Loomis, and C. G. McKiel. "Nitrogen removal for on-site sewage disposal. Field evaluation of buried sand filter/greywater systems." Transactions of the American Society of Agricultural Engineers 34, 3 (1991). https://digitalcommons.uri.edu/nrs_facpubs/459