MIL-HDBK-1005/9A
2.4.4.3
Mixing Conditions. Provide sufficient aeration or
mixing conditions to maintain 1 mg/L of dissolved oxygen in tank
contents.
Some equalized wastes may exert no oxygen demand but
will require mixing to maintain solids in suspension. Provide
circulation velocity of at least 1.0 fps at locations over floor
of basin. Consult manufacturers as to circulation capacity of
their aeration or mixing equipment for particular basin
configuration. Provide for removal of deposited solids from
basin, either by drainage and cleaning during off-peak hours or
by cleaning without draining. For further information on
aeration equipment and installation, refer to Section 3,
paragraph 3.10.6.
2.4.5
Effect of Industrial Wastes
2.4.5.1
Collection Systems. The characteristics of industrial
process wastewaters must be carefully evaluated so that damage
or blockage of the collection system or safety hazards to
workmen do not result. Waste acids and hydrogen sulfide can
attack concrete and metal conduits. Flammable and explosive
materials should be restricted from the sewer system as they may
cause explosive conditions. Refer to Water Environment
Federation (WEF), Manual of Practice (MOP) No. 3, Regulation of
Sewer Use.
2.4.5.2
Treatment Systems. Structures and personnel at
treatment facilities are subject to the same hazards noted for
collection systems in paragraph 2.4.5.1. In addition, certain
industrial wastes can severely inhibit biological treatment
performance and overload other unit processes. Evaluations of
wastewater characteristics must be closely coupled with proposed
treatment processes to ensure that treatment facilities and
process performance are protected. Refer to paragraph 2.6.4 for
a discussion of treatability studies and industrial pretreatment
requirements.
2.4.6
Limits on Biological Treatment
2.4.6.1
Conventional Pollutants. When toxic substances are
absent, use loading criteria for conventional pollutants
presented in MIL-HDBK-1005/8, Domestic Wastewater Control.
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