Record Display for the EPA National Library Catalog


Main Title Removal of Nitrogen from Tile Drainage, Bio-Engineering Aspects of Agricultural Drainage San Joaquin Valley, California.
Author Brow, Randall L. ;
CORP Author California State Dept. of Water Resources, Fresno. San Joaquin District.
Year Published 1971
Report Number DWR-174-9; DI-14-06-200-3389A; EPA-13030-ELY; R2-71-6,; 13030-ELY-5/71-6
Stock Number PB-215 417
Additional Subjects ( Irrigation ; Water pollution) ; ( Chemical removal(Water treatment) ; Nitrogen) ; ( Tile drains ; Chemical removal(Water treatment)) ; Cost estimates ; Algae ; Nitrogen fixation ; Electrodialysis ; Harvesting ; Coagulation ; Desalting ; Bacteria ; Lagoons(Ponds) ; Dewatering ; Performance evaluation ; Methyl alcohol ; Vacuum filtration ; Return flow ; Denitrification ; Water pollution control ; Reverse osmosis ; Anaerobic lagoons ; Scenedesmus
Library Call Number Additional Info Location Last
NTIS  PB-215 417 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 40p
Studies have shown that it is technically feasible to reduce 20 mg/l nitrate-nitrogen in agricultural tile drainage to 2-5 mg/l by either algae stripping or bacterial denitrification. Conditions necessary for maximum algal growth included 8- to 12-inch pond depth, addition of small amounts of nutrients (CO2, Fe, and P), up to four hours of daily mixing and detention times of from 5 to 16 days, depending on the season. The algae were harvested by coagulation-sedimentation followed by vacuum filtration. Bacterial denitrification was tested in anaerobic deep ponds and filters using methanol as a carbon source. Required detention times were on the order of 8 to 50 days for covered ponds (uncovered ponds were not suitable) and 1 to 2 hours for filters. Preliminary cost estimates are given. Laboratory studies indicated that nitrogen removal effectively lowered the biostimulatory nature of the waste with respect to algal growth in potential receiving waters. Two desalination processes were also studied -- electrodialysis and reverse osmosis. (Author Modified Abstract)