MIL-HDBK-1005/9A
2.6.6.2
Wastewater Characteristics. The wastewater generated
from these operations contains numerous constituents including
chromium, cyanide, phenol oil, and various heavy metals.
2.6.6.3
Treatment System. Preliminary Engineering Studies
should be conducted in accordance with NAVFACINST 4862.5 to
establish the appropriate treatment processes to be applied to
wastewater sources at NADEP installations. Refer to paragraph
2.6.4 for treatability study requirements. Figure 4 shows a
system schematic for treatment or pretreatment of NADEP
wastewater. It assumes separate collection systems for mixed
(acid and alkali) wastewater, phenolic wastes, cyanide wastes,
and chrome bearing wastes. A separate treatment scheme is
provided for each wastewater. The treatment systems, however,
have piping and operational flexibility to treat any of the
individual wastewaters in series in the event that cross-
contamination (connection) occurs in the collection system. GAC
columns are not shown in the schematic.
GAC may be required for effluent polishing to remove
metals or partially oxidized phenol. Treatment process
schematics and control logic for batch chrome reduction, batch
cyanide oxidation, and batch phenol oxidation are shown in
Figure 5. Treatment process schematics and control logic for
batch and continuous flow metal precipitation are shown in
Figure 6.
Concentrated oily wastewaters and wastewaters
containing solvents and degreasers should be handled separately
(refer to Section 3). Low levels of oil and grease can be
accommodated by the systems shown in Figure 4.
2.6.7
Naval Air Station
2.6.7.1
Operations. Operations generating industrial wastes
at a typical air station include washracks and service
maintenance areas. Other operations can include those found at
NADEP installations (refer to paragraph 2.6.6).
2.6.7.2
Wastewater Characteristics. Wastes from washracks and
maintenance and service aprons will predominantly consist of
oils and solids.
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