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DEFINITIONS <br />Wastewater means untreated sewage. <br />Effluent means the liquid by-product of the wastewater treatment process. <br />Wastewater Collection Network means the system of pipes which convey the untreated <br />wastewater from individual homes and other establishments to the treatment plant. <br />Wastewater Interceptors are defined as parts of the collection system which connect directly to <br />and convey sewage to the treatment plant. <br />Wastewater Trunk Mains are components of the collection system which connect directly to and <br />convey sewage to the interceptors through a gravity system. <br />Pump Stations are mechanical devices used to pump sewage through the collection network <br />(force mains) for the purpose of transporting the untreated wastewater to the treatment plant. <br />Force Main means a pressurized segment of the collection system. <br />Wastewater Treatment Plant means the facility which functions to remove solid and organic <br />materials from the wastewater. <br />Wastewater Treatment Process is the means by which solid and organic materials are removed <br />from the untreated wastewater. <br />Level of Wastewater Treatment is defined by the proportion of solid and organic materials <br />removed from the wastewater. The most common levels of treatment are: primary, secondary, <br />and tertiary. <br />Primary Treatment removes between 30 and 35 percent of the organic material and up to 50 <br />percent of the solids from the sewage. Because screens and settling tanks are the most common <br />methods used to remove the solids, this process is also referred to as physical treatment. <br />Secondary Treatment removes between 80 and 90 percent of the total organic material and <br />suspended solids from the sewage. This level of treatment generally requires multiple steps <br />involving one biological process and one or more physical processes for removal of suspended <br />solids. <br />Tertiary Treatment is a level of wastewater treatment which removes the organic material and <br />suspended solids, synthetic organic compounds and inorganic chemicals. If not removed, these <br />agents may cause pollution problems. Tertiary treatment adds steps to the primary and <br />secondary processes which will remove these pollutants. The most common tertiary processes <br />Community Development Department Indian River County 2 <br />Appendix A <br />