1321 - Office of Legacy Management - U.S. Department of Energy

FDF Subcontract No. 98SC000001
IT Project No. 773481
I 1321
Description of opaption & process
IssueDatc 2/13/98 Rev.B
The following sections discuss management of the five site water categories given above.
Routing of water to the Clearwell (part of the request to the Ohio EPA explained above) is
included in these sections where appropriate.
2.8.1 Process Wastewater
The following is a list of process wastewater sources:
Cooling tower blowdown water
Water purged from the APC system oivwater separator
BackwasWrecycle water fiom the IT WTS.
These streams will remain relatively constant throughout operations at the site and are not
expected to change during the various excavation phases. The sections below describe the
method by which the water will be collected and transferred to the WTS, the expected flow rate,
and notes on the chemical composition of each stream.
2.8.1.1 Cooling Tower Blowdown Water
A blowdown stream from the cooling tower in the dryer system will be routed to the Clearwell
for subsequent treatment by the WTS. This stream is expected to be approximately 40,320 gpd
and is not expected to contain contaminants at levels higher than the BSL WAC.
2.8.1.2 OiYWater Separator Discharge
Process water generated by the APC system associated with the thermal dryer will be combined
and routed through an oiywater separator for removal of any free-phase organics. The aqueous
stream fiom the oiYwater separator will be pumped to the fluent tank in the WTS. This stream
is not expected to exceed 47,520 gpd.
2.8.1.3 Backwashhtecycle Water from the WTS
Water generated during the backwashing of the sand filter and ion exchange beds in the WTS is
piped to flow directly to the Clearwell. The line pressure supplied by the backwash will be
sufficient to transfer the water to the Clearwell, no additional pump is necessary. The average
flow of backwash water fiom the WTS to the Clearwell is approximately 15,000 gpd. This
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stream will have a high suspended solids concentrati6.
KN/39571WPRAPIEUEL.W2-20-98(909 m)lDl/NE 17
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