PARKSON Hycor ThickTech RDT400, Инструкция по установке, эксплуатации и обслуживанию

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8. Turn off the rotary drum drive.
9. Turn off the spray water booster pump then turn off the spray water supply (close
inlet valve).
10. Turn off control power.
11. Open the flock tank drain valve (supplied by customer), drain the flock tank and
rinse the interior thoroughly.
If debris, such as raggy material, remains in the rotary drum, wash it to the bottom of the
rotary drum. If there is a small amount, do nothing; it will be removed the next time the unit
is run. If there is a large amount of material, you will have to remove it manually.
Note: The water spray system should always be ON when the rotary drum is
running!
Turning off the polymer feed system and supplying untreated sludge to the ThickTech unit
permits untreated sludge to break down the treated material in the flocculation tank and the
tumbling mass of solids in the rotary drum. Watch the discharge end of the unit closely. If
the untreated flow to the thickened sludge hopper/conveying system is too great, you may
need to decrease the flow into the unit to prevent flooding.
Screen cleanup is the principal maintenance function following shutdown. The rotary drum
wire screen must be kept free of dried sludge. Dried sludge will blind the screen and is
difficult to remove. Following the recommended shutdown procedures will ensure a clean,
trouble free screen. For shutdowns less than 3 hours (shorter where conditions dry the
sludge faster), the ThickTech unit can be stopped without going through the clean-up
procedure outlined in the Operating Instructions of this manual. Screens may be removed
for cleaning, if desired, but this is usually unnecessary.
Other considerations:
Polymers play an important role in the operation of the ThickTech rotary drum thickener.
Pay careful attention to polymer selection. Representatives of various polymer
manufacturers offer their services in the testing and selection of the best polymers for your
application. Parkson recommends utilization of these services. With an optimized polymer,
the ThickTech unit will demonstrate its key feature, chemical conservation.
Important factors in problem free ThickTech operation are consistent influent sludge solids
and flow. One of the factors in proper polymer dosage is the amount of solids in the
sludge. If the influent sludge has a constantly variable solids percentile, the proper dosage
of polymer will also be equally as variable. If the solids in the influent sludge change
significantly, then it is advisable to install an equalization basin where the sludge can be
delivered, mixed to allow a homogenous blend of solids, and delivered to the ThickTech
unit.
The influent flow rate of sludge also affects the polymer dosage. As the flow rate
increases, so does the demand for polymer, and the dosage will have to be adjusted
accordingly. A constant flow of sludge is advised for low maintenance operation.
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