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Paper Mill and
De-Inking Effluent Treatment
WILLIAM C. MARTIN, Technical Director
Kimberly-Clark Corporation
Moraine Mill
West Carrollton, Ohio
Last December Kimberly-Clark started up its expanded paper making
facilities at the Moraine Mill at West Carrollton, Ohio. A second paper machine was installed and a new enlarged de-inking operation was started. Prior
to the recent expansion, a primary waste treatment plant was designed with
ample capacity to accommodate the expanded mill requirements.
There was sufficient land available at the paper mill site for the construction of the proposed effluent plant, but since the paper mill is located
inside the corporation limit and one mile from the Miami River, the sludge
generated by the effluent plant would have had to be hauled through the village streets around the clock -- often seven days per week. The decision,
therefore, was made to buy sufficient land at the Miami River on which to
to build the effluent plant and to store the solids generated.
DESCRIPTION OF EQUIPMENT
Best engineering estimates set the expanded mill effluent flow in the
range of 3.0 to 5.5 million gals per day. Wherever possible, duplicate
equipment was installed for greater flexibility and protection.
The existing mill effluent line, which did go to the river, has been
altered and extended so that now the industrial waste is pumped directly to
the new effluent plant. At the effluent plant the water enters a large wet
well. Two 3, 800 gpm Bingham Evenflo pumps are used to pump the waste
from the wet well to either clarifier. Each pump will handle the normal
flow. One pump operates continuously with the second pump on probe level
control.   There is room for two additional pumps in the wet well.
Two 80-ft diameter Dorr Settlers with a 14-ft side water depth were
specified. These provide a minimum of four hours settling time at maximum
expected flows. Even if operating only one clarifier, there would be a minimum of two and one-half hrs theoretical detention. It was felt that the additional detention time available with both clarifiers operating would aid
in giving maximum solids and BOD removal without the use of added chemicals. Also, the effluent flow from papermaking operations is subject to
wide fluctuations during periods of washups and startups. There are other
known variables such as temperature changes, felt washing compounds, etc.,
that could upset normal solids removal unless a large safety factor was designed into the size of the clarifiers.
Each clarifier is equipped with a skimmer arm and scum dumping mechanism. The scum dumps into a scum pit for storage. The same pump that
removes the sludge from the clarifier is valved to empty the scum pit when
it becomes full.
The drives on the clarifier rake arms are equipped with torque sensing
elements.    This permits the operator to adjust the sludge pump-out rate as
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