tank just visible. Increase or decrease rate of slurry flow from the erdlator tank to the sludge concentrator tank. 'o
increase or decrease flow adjust plug control valve CV-17 (2, fig. 2-22) to the wet well tank or adjust drain valve DV-21
(3, fig. 2-19).
The gate control valve CV-14 (1, fig. 2-19) in the line from weir box to the sludge concentrator tank
should be completely open. Never use this valve to control rate of slurry flow into the sludge
Wet well warning buzzer and light.
The operation of the wet well warning buzzer and light indicates that the water in the wet well tank is
low. If low water level persists, decrease the filter flow through the controller valve CV-45 (6, fig. 2-23) to 22 gpm. If low
water level persists, turn the effluent plug control valve CV-46 (5) to R (recirculate) to maintain the coating on the filter
elements until the trouble can be determined.
Low water level in the wet well could be caused by any of the following:
Suction strainer clogged.
Raw water hoses damaged or clogged.
Raw water pump fails to deliver sufficient water.
Valves not properly positioned.
Filter operation check. Should any of the following occur, backwash the filter elements and wash the filter
bottom (para 2-6, b. (1)).
Large areas of the filter elements are not covered with diatomaceous earth.
The suspended material is visible in the filtered water or the water appears cloudy.
If the effluent pressure indicator gage PG-3 (8, fig. 2-23) reads less than 25 psi.
If the filtered water flow drops noticeably indicating that it is no longer practical to continue the filter
run. To put filter in operation again, refer to paragraph 2-4 c. (3).
Coagulated water may be obtained for precoating, preparing chemical solutions, or any general
purpose from the angle control valve CV-15 (7, fig. 2-15).
Change 1 2-57