BOD/TSS Mass Loading and Percent Removal
Load (lb/day) = MGD x mg/L x 8.34, removal% = (in - out)/in x 100. 1 MGD, 200 -> 20 mg/L -> 1,668 lb/day in, 1,501 removed, 90%; a 4 MGD plant carries 6,672 lb/day at the same 90% (load scales, efficiency does not). An effluent above influent flags an upset. The operator of record governs.
Formula and source
influent_lb = flow x influent x 8.34; effluent_lb = flow x effluent x 8.34; removed = influent_lb - effluent_lb; removal% = (influent - effluent)/influent x 100.
BOD/TSS mass loading and percent removal via the pounds formula, standard wastewater-operations practice, by name.
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