(A) The following described substances, materials, water or wastes shall be limited to discharges to municipal systems, to concentrations or quantities which will not harm the municipal sewers, wastewater treatment process equipment, will not have an adverse effect on the receiving waters, or will not otherwise endanger life, limb or public property, or constitute a nuisance. The approving authority may set limitations lower than the limitations established in the regulations below at specific discharge points, if such limitations are necessary to meet the above objectives. In forming an opinion as to acceptability, the approving authority will give consideration to such factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment facility and other pertinent factors.
(B) The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer, which shall not be violated without written approval of the approving authority, are as follows:
(1) Temperature limit. Wastewaters having a temperature higher than 150ºF (65ºC);
(2) Oil content. Wastewater containing more than 25 milligrams per liter (25 mg/l) of petroleum oil, non-biodegradable cutting oils or products of mineral oil origin;
(3) Grease limit. Wastewater containing fats, wax, oils and grease, whether emulsified or not, shall not exceed a concentration of 100 milligrams per liter. This concentration limit shall be lowered if it is found that the substances are solidifying or becoming viscous and creating obstructions in the sewerage system;
(4) Garbage restriction. Garbage that has not been properly shredded. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments or similar places where the garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises, or when served by caterers;
(5) Metals restrictions. Water or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances to such a degree that any such material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the approving authority in compliance with the WPDES permit and applicable state regulations;
(6) Odor limit. Water or wastes containing odor-producing substances exceeding limits which may be established by the approving authority in compliance with state regulations and to those levels which do not create a nuisance;
(7) Slugs. Quantities of flow, concentrations or both, which constitute a slug, as defined in § 52.02;
(8) Incompatible wastes. Water or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable to treatment only to such a degree that the wastewater treatment plant effluent cannot meet the requirements of the village’s WPDES permit;
(9) Interactive wastes. Water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes; or
(10) Materials which exert or cause unusual excessive conditions:
(a) Unusual BOD, chemical oxygen demand or chlorine requirements in such quantities as to constitute a significant load on the wastewater treatment plant;
(b) Unusual concentrations of inert suspended solids, such as fuller’s earth, lime slurries and lime residues, or of dissolved solids, such as sodium sulfate; or
(c) Excessive discoloration, such as dye wastes, inks and/or vegetable tanning solutions.
(Ord. passed 9- -2011)