Table 3-2. Troubleshooting - Continued
TEST OR INSPECTION
WATER PURIFICATION UNIT-Cont
Chemical dosage incorrect. Adjust chemical dosage. (Refer to para 2-4 c. (1)).
Banking or rotating slurry, too much slurry pool motion. Decrease the agitator mixing speed.
Boiling appearance of slurry pool baffles in bottom of erdlator tank plugged. Drain and clean the
Large floc particles and foam on the water in the erdlator tank caused by inadequate agitation or
leaks on the suction side of the raw water pump. Increase the agitator mixing speed and tighten the
suction hose connections. No air should appear in the raw water sight glass.
Slurry pool remains too high, due to excessive input flow. Adjust the main influent gate valve (3, fig.
2-10) to 50 GPM.
No rotation in the slurry pool at maximum agitator speed. Increase the input flow to at least 60 GPM.
5. ERDLATOR FAILS TO DELIVER DESIRED QUALITY OF WATER.
Water above the slurry pool looks gray or cloudy. Increase the ferric chloride solution rate of
discharge. Move the feed indicator FEI-7 (5, fig. 2-5) to a higher feeder scale (8) reading. Use the
ferric chloride solution calibration chart (fig. 2-6) as an aid in determining the proper setting.
Water above the slurry pool looks reddish or iron colored. Decrease the ferric chloride solution rate
of discarge. Move the feed indicator FEI-7 (5, fig. 2-5) to a lower feeder scale (8) reading. Use the
ferric chloride solution calibration chart (fig. 2-6) as an aid in the proper setting.
Change 1 3-16