Substance
|
Maximum Permissible Concentration
| |
---|---|---|
Phenolic compounds as C5H60H
|
1.0 mg/l
| |
Cyanides as CN
|
0 mg/l
| |
Cyanates as CNO
|
0 mg/l
| |
Iron as Fe
|
0.3 mg/l
| |
Trivalent Chromium as Cr. plus)
| ||
Hexavalent Chromium as Cr)
|
0.5 mg/l
| |
Nickel as Ni
|
1 mg/l
| |
Copper as CU
|
0.03 mg/l
| |
Lead as Pb
|
0.5 mg/l
| |
Zinc as Zn
|
0.15 mg/l
|
Rs
|
=
|
0.00834 P (C - 300)
| ||
---|---|---|---|---|
Where:
| ||||
RS
|
=
|
The BOD surcharge rate in cents per 1,000 gallons
of waste discharged.
| ||
P
|
=
|
The average annual fixed, operating and maintenance cost of tertiary treatment processes per pound of BOD received at the treatment works (see Sewer Rate Ordinance at Article VIII below).
| ||
C
|
=
|
The average BOD of the industrial waste expressed in milligrams per per liter as determined in accordance with § 185-22B of this article.
|
The figure "300" appearing in the above formula
corresponds to the maximum BOD permissible without surcharge. The
figure 0.00834 is the factor to convert milligrams per liter to pounds
per 1,000 gallons. No discount will be permitted for sewage or industrial
wastes having a BOD less than 300 milligrams per liter.
|
Rs
|
=
|
0.00834 x B (S - 350)
| ||
---|---|---|---|---|
Where:
| ||||
RS
|
=
|
The suspended solids surcharge rate in cents
per 1,000 gallons of waste discharged.
| ||
B
|
=
|
The average annual fixed, operating and maintenance cost of the sludge digestion, sludge drying and sludge disposal operations per pound of suspended solids received at the treatment works (see Sewer Rate Ordinance at Article VIII below).
| ||
S
|
=
|
The average suspended solids concentration of the abnormal industrial waste expressed in milligrams per liter as determined in accordance with § 185-22B of this article.
|
The figure 350 appearing in the above formula
corresponds to the maximum suspended solids concentration permissible
without surcharge. The figure 0.00834 is the factor to convert milligrams
per liter to pounds per 1,000 gallons. No discount will be permitted
for sewage or industrial wastes having a suspended solids concentration
less than 350 milligrams per liter.
|