Wastewater and its characteristics.
AVERAGE-STRENGTH SEWAGE
Sewage with characteristics not exceeding a five-day 20°
C. biochemical oxygen demand of 200 mg/l, a suspended solids content
of 200 mg/l and an ammonia nitrogen content of 15 mg/l based on 100
gpcpd.
BOD (DENOTING "BIOCHEMICAL OXYGEN DEMAND")
The quantity of oxygen utilized in the biochemical oxidation
of organic matter under standard laboratory procedure in five days
at 20° C, expressed in milligrams per liter.
COMPATIBLE POLLUTANT
Biochemical demand, suspended solids, pH and fecal coliform
bacteria, plus additional pollutants identified in the NPDES permit.
FLOATABLE OIL
Oil, fat, or grease in a physical state such that it will
separate by gravity from wastewater by treatment in an approved pretreatment
facility. Wastewater shall be considered free of floatable fat if
it is properly pretreated and the wastewater does not interfere with
the collection system.
GARBAGE
Solid wastes from the domestic and commercial preparation,
cooling, and dispensing of food, and from the handling, storage, and
sale of produce.
INDUSTRIAL WASTE
Any solid, liquid or gaseous substance discharged, permitted
to flow or escaping from an industrial, manufacturing, commercial
or business establishment or process or from the development, recovery
or processing of any natural resource as distinct from sanitary sewage.
INFILTRATION
The water entering a sewer system, including building drains
and sewers, from the ground, through such means as, but not limited
to, defective pipes, pipe joints, connections, or manhole walls. (Infiltration
does not include and is distinguished from inflow.)
INFILTRATION/INFLOW
The total quantity of water from both infiltration and inflow
without distinguishing the source.
INFLOW
The water discharge into a sewer system, including building
drains and sewers, from such sources as, but not limited to, roof
leaders; cellar, yard, and area drains; foundation drains; unpolluted
cooling water discharge; drains from springs and swampy areas; manhole
covers, cross-connections from stormwaters, surface runoff, street
wash waters or drainage. (Inflow does not include, and is distinguished
from, infiltration.)
MAJOR CONTRIBUTING INDUSTRY
An industrial user of the publicly owned treatment works
that:
(1)
Has a flow of 50,000 gallons or more per average work day;
(2)
Has a flow greater than 5% of the flow carried by the municipal
system receiving the waste;
(3)
Has in its waste a toxic pollutant in toxic amounts as defined
in standards issued under Section 307(a) of the Act; or
(4)
Is found by the permit-issuing authority, in connection with
the issuance of a NPDES permit to the publicly owned treatment works
receiving the waste, to have significant impact, either singly or
in combination with other contributing industries, on that treatment
works or upon the quality of effluent from that treatment works.
MILLIGRAMS PER LITER
A unit of the concentration of water or wastewater constituent.
It is 0.001 g of the constituent in 1,000 ml of water. It has replaced
the unit formerly used commonly, parts per million, to which it is
approximately equivalent, in reporting the results of water and wastewater
analysis.
pH
The logarithm (base 10) of the reciprocal of the hydrogen-ion
concentration expressed in grams per liter of solution. It shall be
determined by one of the procedures outlined in Standard Methods.
POPULATION EQUIVALENT
A term to evaluate the impact of industrial or other waste
on a treatment works or stream. One population equivalent is 100 gallons
of sewage per day, containing 0.20 lb./D of suspended solids or 0.17
lb./D of BOD. The impact on a treatment works is evaluated as the
equivalent of the highest of the three parameters. Impact on a stream
is the higher of the BOD or suspended solids parameters.
[Amended by Ord. No. 10-01-07]
PPM
Parts per million by weight.
PROPERLY SHREDDED GARBAGE
The wastes from the preparation, cooking, and dispensing
of food that have been shredded to such degree that all particles
will be carried freely under the flow conditions normally prevailing
in public sewers, with no particle greater than 1/2 inch (1.27 centimeters)
in any dimensions.
SEWAGE
A combination of the water-carried wastes from residences,
business buildings, institutions, and industrial establishments, together
with such groundwater, surface water, and stormwater as may be present.
SIGNIFICANT INDUSTRY
Any industry that will contribute greater than 10% of the
design flow and/or design pollutant loading of the treatment works.
SLUDGE
Any discharge of water, sewage, or industrial waste which
in concentration of any given constituent or in quantity of flow exceeds
for any period of duration longer than 15 minutes more than five times
the average twenty-four-hour concentration of flows during normal
operation.
STANDARD METHODS
The examination and analytical procedures set forth in the
most recent edition of Standard Methods for the Examination of Water
and Wastewater published jointly by the American Public Health Association,
the American Waterworks Association and the Water Environment Federation.
SUSPENDED SOLIDS
Solids that either float on the surface of, or are in suspension
in water, sewage, or industrial waste, and which are removable by
a laboratory filtration device. Quantitative determination of suspended
solids shall be made in accordance with procedures set forth in Standard
Methods.
UNPOLLUTED WATER
Water of quality equal to or better than the effluent criteria
in effect or water that would not cause violation of receiving water
quality standards and would not be benefited by discharge to the sanitary
sewers and treatment facilities provided.
WASTEWATER
The spent water of a community. It may be a combination of
the liquid and water-carried domestic wastes from residences, commercial
buildings, industrial plants and institutions, together with any groundwater,
surface water, and stormwater that may be present and which is not
intentionally admitted.