Environmental Engineering Reference
In-Depth Information
Notes:
Drawing based essentially on experience in California where
requirements are imposed by California State Regional Water
Pollution Control Boards, as well as by USEPA.
Recommendation for DCs: Gravity/API separator only, with due
attention to O&M. Where more is needed for eco-protection,
supplement with prolonged ponding (several days).
Raw waste : Oil
=
100 mg/l (typical)
(C) Biological Stabilization
5
Oil = 2 mg/l
(A) + (C)
(B) Improved Gravity Seperation
Follow API separator by final
ponding, or precede API separator
by chemical flocculation, or use
disssolved air floatation process.
2
Oil = 5 mg/l
(A) + (B)
1
Oil = 15 mg/l
(A)
(B)
(C)
1900
1950
2000
FIGURE 4.13 Schematic drawing showing effluent standards removal of oil from
petroleum refinery waste.
Permit system to be established by MSS that authorizes industries to dis-
charge into MSS, including provisions for fees to be paid by the participating
industry
Note that this recommended system is patterned after that used by the Los
Angeles Country Satiation Districts (LACSD) circa 1970, which is considered
to be practicable for DC use. The current system utilized by LACSD, as now
required by the U.S. EPA, is much too sophisticated/expensive for DC use 105 .
Discharge Directly to Environment
These discharges must be controlled in the DCs by use of the permit system
already described, administered by the local authority with this power (which
may be the MSS for industries within the municipal boundaries). In most DCs,
the permit system is administered by the NEnPA, which requires preparation by
the industry of an approved EIA before the Ministry of Industry can issue its
permit that allows the industry to be built and operated. The EPMs specified in
the approved EIA are included in the Ministry of Industry permit.
 
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