| A | B |
|---|
| Total suspended solids (TSS), mg / l | [dry solids in grams x 1000 mg / g x 1000 ml / l] / ( sample volume in mls) |
| Total Solids (TS), mg / l | (A - B x 1000) / sample vol in mL |
| A | weight of dish + dried residue in milligrams |
| B | weight of dish in milligrams |
| Volatile Solids (VS), mg / l | [( A -B) x 1000] / sample volume in ml |
| Ai | weight of residu + dish before ignition in mg |
| Bi | weight of residue + dish after ignition in mg |
| percent (%) Volatile solids | [(A-C) x 100] / sample vol in mL |
| Az | weight of dish + dried residue in mg |
| Bz | weight of dish in mg |
| Cz | residue + dish after ignition in mg |
| F / M ( food to microorganisms) ratio | [BOD ( or COD) in mg /l x MGD x8.34 / [MLVSS in mg / l x aeration basin vol. in MG x 8.34) |
| Brake horsepower (Brake HP) | (flow in gpm x total head in ft) / (3960 x pump efficiency) |
| Motor horsepower (Motor HP) | (gpm x total head in ft) / (3960 x pump efficiency x motor efficiency) |
| water horsepower (water HP) | (gpm x total head in ft) / 3960 |
| Loss of alkalinity due to nitrification, mg / l | 7.2 mg / l of alkalinity is consumed per mg / l of NH3 converted to NO3 |
| pump electrical cost per year | hp x .746 x # of hrs. pump operates per day x cost ($) per wk kW/hr x 365 days/yr. |
| Watts | volts x amps= (voltage / ohms) |
