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Letter of transmittal
Confirmatory data from experimental trickling filter
Trickling filter dosing by G C Habermeyer and
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0O OO absorption acre per day activated sludge adsorption aeration ammonia average bacterial film bed April bed March Beggiatoa cent removal coarse colloidal concentration cubic deeper filter degree of purification Denitrification depth of filter distribution dosing tank effluent feet deep filter bed filter medium filtration Flagellates flocculent gallons per acre given in Table half of bed Holotrichs Imhoff tank inches increased Infl interface intermittent Lawrence Experiment Station layer million gallons Nitrate nitrogen nitrification nitrogen ppm nozzle O0 OO obtained OO 0O OO O0 OO OO OO7 Apr OO7 Mar organic matter organic nitrogen oxidation Oxygen consumed Peritrichs plant pump sampling pipes sewage flow sewage purification sewage treatment siphon six feet six-foot filter soluble solution spray sprinkling filter stones substances Suctoria surface tension ten-foot filter tion trickling filters trough turbidity volume