b'GENERAL INFORMATION When a public sewer system is not available, a building sewer When a public sewer system is not available, a building sewer is required to is required to have an on-site have an on-site wastewater treatment system. Local and state authorities typicallywastewater treatment system. regulate on-site sewage treatment systems. There are two main types of onsiteLocal and state authorities wastewater treatment systems; typically regulate on-site sewage 1. Anaerobic - (no oxygen) treatment systems. 2. Aerobic - (oxygen using)This document will discuss the typical aerobic treatment system. The aerobicFEATUREStreatment systems are also known as aerobic biological systems or packageOSHA Manway Access Covertreatment systems. This type of systems treats wastewater better than the typicalChemical Resistant Tank anaerobic septic systems. The aerobic system offers better solids separation Constructionand reduced sludge volume. The aerobic system produces high quality effluent,which can be disposed of through one of the following methods: Prepackaged System for Easy 1. Conventional soil absorption beds Specification & Installation2. Drip irrigation Maintenance Notification 3. Above ground spraying System; Alerts of Tank Full CapacitySYSTEM COMPONENTS Optional Metering PumpThe ParkUSA aerobic treatment system includes the following standard & Controls& optional components: Concrete Containment VaultHigh Level Monitoring Sensors & ControlsPrecast Concrete Access covers or hatchwaysSafety hatch nets OPERATIONSeptic/Pretreatment Tank: The septic or pretreatment tank should be constructed to maximize the amount of solids it separates. The tank can be single or double compartments and made of precast concrete (4500 psi@28 days). Adequate access must be provided to each compartment for easy accessibility, inspection, and cleaning. The septic/pretreatment tank shall be constructedin conformance to ASTM-C1227 and local/state requirements.Aerobic Treatment Plant: The treatment plant is a pre-engineered treatment tank that utilizes aerobic (oxygen using) action to break down raw sewage.This system consists of concrete or fiberglass mixing tank, an internal cone shaped settling chamber and air injection equipment. The injected air enables naturally occurring bacteria to thrive and grow in much greater numbers than would occur naturally. This overpopulation of the bacteria speeds the process of breaking down the sewage.The raw sewage enters the mixing chamber where mixing occurs through an air distribution system. The solids remain in suspension with a general flow up the mixing tank wall and down the outside of the settling chamber. The mixed liquid then enters the settling chamber from the bottom. The settling chamber maintains a quiet condition that allows solids to settle down and re-enter the mixing chamber for more processing. The liquid is hydraulically displaced upward and is discharged as clear odorless treated water that meets or exceeds state water quality standards. Treatment tanks must meet stringent specificationsand are ANSI/NSF 40 Certified and state approved.Pump/Dosing Tanks: The sewage discharge from the treatment tank gravityflows into the pump tank. The pump tank is constructed of concrete or fiberglass.The tank contains either one (simplex) or two (duplex) submersible pumps.When the level rises to a set level the pump(s) will pump the treated sewageto an absorption bed, drip irrigation field or above ground sprayers. The pump(s)is controlled with float switches, control panel and a timer.438'