Aerobic Septic Treatment
Aerobic biological treatment systems, the newest type of on-site waste-water treatment systems, are much better at water treatment than their old counterparts; anaerobic septic systems.
When a public sewer system is not available in your area, you are required to have an on-site waste- water treatment system which is usually regulated by your local or state authorities.
Waste-water treatment systems
The typical on-site waste-water treatment system consists of a pretreatment tank, constructed in compliance with ASTM0C 1227 and the local/state requirements. This tank functions similarly to a septic tank; it removes most of the solids. The pretreatment tank is constructed to maximize the amount of solids it separates. It is available in single or double compartments and made of precast concrete (4500 psi @ 28 days). It is critical that sufficient access be provided to each compartment so that it is easily accessible for inspection and cleaning.
Process
The liquids are transferred to a sewage treatment plant consisting of a pre-engineered treatment tank which utilizes the aerobic process or action to decompose raw sewage by utilizing oxygen to break it down. This system consists of a concrete or fiberglass mixing tank, an internal cone shaped settling chamber and air injection equipment. The injected air makes it possible for the naturally occurring bacteria to thrive and grow in much greater numbers than they naturally would. This large overgrowth of bacteria speeds up the process of breaking down the sewage.
When the raw sewage enters the mixing chamber it passes through an air distribution system where the solids remain in suspension with a general flow up the mixing tank wall and down the outside of the settling chamber subsequently entering the settling chamber from the bottom. The settling chamber remains still or quiet which allows the solids to settle down and re-enter the mixing chamber for more processing. The liquid will be moved upward by hydraulic displacement and then be discharged as clear and odorless treated water meeting the state’s quality standards.
Third tank
A third tank, the pump/dosing tank, is used to pump the effluent to the final disposal point using a device to add chlorine (if needed) and disperse the water to a leaching chamber, gravel bed, seepage mound, drip irrigation, or sprinkler irrigation. A chlorinator can be added if the treated sewage needs further treatment; this will kill any remaining pathogens. The chlorinator is normally used for above ground disposal systems.
The aerobic treatment system should be designed by a professional engineer or registered sanitarian. For more detailed information you can contract your state or go to the government site at: http://cfpub.epa.gov/owm/septic/index.cfm. This new system surely beats the old septic tank with an absorption field that would flood during the prolonged rainy weather.
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