| 摘要 |
The Three Stage Sewage Treatment System ("TSSTS") processes sewage for buildings not connected to a municipal sewer system. It employs a three stage process for cleaning sewage in a single, light-weight, easy-to-install unit. Sewage is initially cleaned anaerobically in the pre-treatment tank as gravity acts to separate solids from the effluent. Sewage then flows into the aerobic tank for further cleaning by aerobic microorganisms and continued gravity separation of solid contaminants from the effluent. The aerobic tank is divided into an inner chamber and an outer chamber by a funnel-shaped clarifier. In the TSSTS, the clarifier is a separate piece with a lip around the top of the funnel-shaped main body. The lip of the clarifier rests atop the sidewalls of the aerobic tank, and the clarifier hangs down in the aerobic tank, with an opening in the bottom of the clarifier held above the bottom of the aerobic tank. Air droptubes hang down in the outer chamber of the aerobic tank, so that sewage in the upper part of the outer chamber is aerated, stimulating anaerobic microorganisms which digest the sewage. An air feed conduit connects the air droplines to an external air compressor and rests upon a rim on the clarifier. The sewage in the outer chamber moves into the inner chamber inside the clarifier where gravity separates solids from the effluent. This cleaned effluent is then drained to the post-treatment tank where it is chlorinated and stored for discharge. The TSSTS uses a single cover to seal all three tanks, adding structural support while simplifying manufacture. To reduce the weight, aiding in installation, while retaining the strength and durability needed for a sewage system, the TSSTS is generally made of fibreglass reinforced plastic.
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