For the purposes of this article only, the following words and phrases have the meanings specified in this section, unless from the content, a different meaning is clearly intended.

"Advanced sewage treatment" means additional treatment needed to remove suspended and dissolved substances not normally removed during secondary treatment including organic matter; suspended solids; inorganic ions such as calcium, phosphate, nitrate, and potassium; as well as synthetic organic compounds.

"Air contaminant/odor control" means a process that neutralizes air contaminants and odors emanating from sewage caused by the decomposition of organic matter in raw sewage and reduces such air contaminants or odors to the appropriate air discharge limitations.

"Air stripping" means a process utilized for the removal of ammonia that may be toxic to aquatic life, or for the removal of volatile organic compounds (VOCs), some of which are carcinogenic.

"Biological nutrient removal (nitrification-denitrification)" means a process by which the nitrogen content of sewage treatment plant effluent is decreased in order to reduce the growth of algae and aquatic plants in receiving waters. This process also lowers the content of ammonia, which is toxic to aquatic life, in treated sewage effluent.

"Dechlorination" means the process by which chlorine, which may be toxic to aquatic life, is removed from the treated sewage treatment plant effluent following disinfection.

"Granular activated carbon treatment" means a process in which non-volatile and semi-volatile organic compounds are removed through adsorption on the surface of carbon particles.

"Secondary sewage treatment" means treatment by which dissolved or suspended materials are converted through biological action and sedimentation to a form that allows more ready separation and results in a sewage treatment plant effluent that can be characterized by the following average constituent concentrations: (A) BOD: 30 milligrams per liter, (B) TSS: 30 milligrams per liter, and (C) pH: 6.0 to 9.0.

"Water quality programs" means programs required by the NPDES permit or AZPDES permit for industrial pretreatment enforcement and monitoring, customer education, and plant laboratory analysis and monitoring.

"Water reclamation" means a process or series of processes by which suspended and dissolved solids remaining following secondary or advanced treatment are removed to a level which allows the sewage treatment plant effluent to be used beneficially. This may include flocculation, coagulation and filtration. (Ord. No. G-3585, § 1; Ord. No. G-4635, § 1q, 2004; Ord. No. G-6740, § 1, 2020)