§ 28-02-180. Discharge of certain harmful wastes restricted—Industrial wastes.

No person shall discharge following described substances, materials, waters or wastes if it appears likely in the opinion of the city commission, that such wastes can harm the wastewater facility, or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb, public property or constitute a nuisance. In forming an opinion as to the acceptability of these wastes, the city commission will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature and capacity of the wastewater facility, degree of treatability of wastes in the wastewater treatment works and other pertinent factors. The substances which must be considered include, but are not limited to, the following:

(a)

Any liquid or vapor having a temperature higher than one hundred fifty (150) degrees Fahrenheit or sixty-five (65) degrees Celsius.

(b)

Any water or waste containing fats, grease, wax or oils, whether emulsified or not, in excess of one hundred (100) mg/l or containing substances which may solidify or become viscous at temperatures between thirty-two (32) degrees Fahrenheit and one hundred fifty (150) degrees Fahrenheit or zero (0) Celsius to sixty-five (65) degrees Celsius.

(c)

Any garbage that has not been properly shredded. The installation and operation of any garbage grinder larger than those normally manufactured and sold for residential and noncommercial use will not be installed without specific review and approval by the city commission.

(d)

Any waters or wastes containing strong acid, iron pickling wastes, or concentrated plating solutions, unless completely neutralized and approved by the city commission for discharge.

(e)

Any waters or wastes containing reducing substances of an organic or inorganic nature, toxic or nontoxic, which exert an immediate chlorine demand, if discharge of such agents will prevent the achievement of an adequate chlorine residual in the effluent of the wastewater treatment works.

(f)

Any waters or wastes containing phenols or other taste or odor producing substances, in concentrations exceeding limits established by the city commission, after treatment of the composite sewage, to meet the requirements of the state, federal or other public agencies of jurisdiction for such discharge to the receiving waters.

(g)

Any radioactive wastes or isotopes of such half-life or concentrations as may exceed limits established by the city commission, in compliance with applicable state and federal regulations.

(h)

Any waters or waste having a pH in excess of 9.5.

(i)

Materials which exert or cause:

(1)

Unusual concentrations of inert suspended solids (such as, but not limited to, Fullers earth, lime residues) or of dissolved solids (such as, but not limited to, sodium chlorine and sodium sulfate).

(2)

Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).

(3)

Unusual chemical oxygen demand, or biochemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the wastewater treatment works.

(4)

Slugs or shocks constituting an unusual volume of flow or concentration of wastes which will disturb the normal functioning of the wastewater facility.

(j)

Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment works employed, or amenable to treatment only to such degree that the effluent cannot meet the requirements of agencies having jurisdiction over discharge to the receiving waters.

(Code 1960, § 8-9-6; Ord. No. 477, 5-2-72)