Environmental Engineering Reference
In-Depth Information
0
Biological treatment
(activated sludge)
5
Treatment by gravity separation plus chemical
coagulation and/or dissolved air floatation
10
15
Treatment by gravity separator (API)
20
1940
1950
1960
1970
1980
1985
FIGURE 4.12
Schematic drawing illustrating requirements in U.S. over Past 50 years
for removal of oil from refinery effluents.
target used in the ICs. An example of this approach is illustrated here from ADB
sources
112
for petroleum refinery wastewaters, as shown here in Figures 4.12
and 4.13. Figures 4.14 show recommendations for control of industrial wastes
disposal of by infiltration into groundwaters for the parameter of total dissolved
solids (TDS).
Discharge into Municipal Sewerage Systems (MSSs)
Box 4.3 describes preparation of a municipal ordinance that encourages industries
to make use of the MSS (municipal sewerage system), which can greatly assist
in financing the overall MSS, but with a system of controls that protects the
MSS and the receiving water environment. The salient control items are the
following:
Restrictions to prohibit discharge into the MSS of any industrial wastewaters
that cannot be received by the municipal system because of hazards of
damage to the system, or to receiving waters or land areas to which the
STP effluent is discharged
•
In-house pretreatment by industries for removing unacceptable constituents
from industrial wastewaters so effluents will be acceptable for discharge to
MSS (or directly to the environment)
•
