TM 5-4610-223-12Ferric chloride........................... 1Calcium hypochlorite ................ 1/4Limestone................................. 1Diatomaceous earth.................. 1/2Carbon ..................................... 1/10(The curve for carbon is on the same chart as for limestone and each curve is identified).(2)Rechargingchemicalslurryfeeder.(a) When the level of limestone or diatomaceous earth slurry in the feeder reaches the low levelmarker, recharge the compartment requiring additional slurry solution.(b) Recharge the limestone compartment as described In paragraph 2-4, c.(4), except that therequired amount of limestone for recharging is 11 pounds.(c) Recharge the diatomaceous earth compartment as described in paragraph 2-4, c.(2), except thatthe required amount of diatomaceous earth for recharging is 5 1/2 pounds.(3)Rechargingchemicalsolutionfeedertanks. When the level of ferric chloride or calcium hypochloritesolution, in the solution feeder tanks (5 and 6, fig. 2-10) drops to approximately 4 1/2 inches from the bottom, rechargethe tank requiring additional chemical solution as described in paragraph 2-4.(4)Preaerationcontrol.(a) The aspirator aeration manifold located above the erdlator tank provides preaeration of the rawwater influent to the influent launder (2, fig. 2-29). The gate control valves CV-10 (5, fig. 2-13) and CV-11 (7) in thismanifold are normally open.(b) The normal operating reading of the pressure gage PG-1 (6) with both valves open is 5 to 7 psi.If the pressure rises above this reading, it indicates that the aspirators (1, fig. 2-27) are clogged or valves are closed.Remove the foreign matter from the aspirators to remedy this condition.(c) If numerous air bubbles are observed on the surface of the water in the erdlator tank, it indicatesthat the water is supersaturated with dissolved gases. Partially close or completely close one or both of the gate controlvalves CV-10 (5, fig. 2-13) and CV-11 (7) as necessary to remedy this condition. This corrective action increases thepressure and aeration and releases dissolved gases. Adjust the raw water influent flow as described in paragraph 2-4 b.(10) (e).(5) Slurryblanketrotation.(a) The slurry blanket in the erdlator must be kept rotating. Banking of the slurry blanket on the outercircumference indicates too much rotation. Insufficient rotation is indicated by lack of rotation of the slurry blanketaround and near the outer circumference.(b) The rotation of the slurry blanket is decreased by moving the agitator drivebelt to a smallergroove of the motor pulley.(c) The rotation of the slurry blanket is increased by moving the agitator drivebelt to a larger grooveof the motor pulley.Change 4 2-55
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