silo 3 - U.S. Department of Energy

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Process Description for the Silo 3 Project
Document No. 40430-RP-0003, Rev. 1
Jacobs Project No. 35H19605
September 5, 2003
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tempecat9re; ,pH, etc.; and keeps any solids in suspension. The tank's bottom outlet is
piped to the suction side of the Wastewater Pump, which is a low-head centrifugal pump
with acid-resistant wetted parts. Wastewater Tank influents are as follows:
0 Excavator Room Sump and Excavator Service Room Sump: These rooms' floors are
sloped to drain into concrete sumps. Infrequently, water may enter the sumps as a
result of washdown and/or excessive misting. Air-operated diaphragm sump pumps are
provided in each sump to transfer water to the Wastewater Tank.
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Wastewater Tank Area Sump: This concrete sump picks up leakage and spillage from
the curbed area surrounding the Wastewater Tank, the Additive Mix Tank, and the two
Additive Charge Tanks. In the Packaging Area, floor drains are provided to transfer
wastewater to the Wastewater Tank Area Sump. An air-operated diaphragm sump
pump transfers the sump's contents into the Wastewater Tank.
In addition to the three sumps, the Wastewater Tank can also receive water from the
process water line for dilution and flushing (see Section 6.4).
Once the level in the Wastewater Tank reaches a preset high value, input from all sources
is shut off. The tank's contents are then sampled and analyzed to ensure that they meet
the Advanced Wastewater Treatment (AWWT) facility waste acceptance criteria.
Arrangements are then made with AWWT personnel to transfer the tank's contents to the
AWWT facility. This is accomplished by using the Wastewater Pump to transfer
wastewater to a tanker truck.
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