ClearFlo Sewage Treatment Plant - How it Works

    ClearFlo sewage treatment unit

B    The ClearFlo sewage unit is a simple two-stage extended aeration sewage treatment unit.  It consists of a conical tank that contains an inner aeration chamber tank, which is open at the base. The space between the inner and outer tank is the clarifier chamber.  A draft tube, positioned 100mm from the base of the clarifier, extends up into the aeration chamber.  Extended aeration sewage treatment plants have major benefits.

1. Air from the compressor is piped to a diffuser in the draft tube.

2. Raw sewage enters the aeration chamber and air surging up from the draft tube aerates the sewage, causing an aerobic bacterial colony to establish in the aeration chamber and digest the organic matter in the sewage.

3. As more raw sewage enters the aeration chamber, an equal amount of effluent displaces through the open bottom into the clarifier.

4. The quiet conditions in the clarifier allow all the suspended solids to sink to the base of the clarifier and they are drawn back up the draft tube by the upward flow of air for further digestion in the aeration chamber. The ClearFlo constantly recycles the sewage via gravity and this is how it achieves nearly total solids digestion.

5. The clear effluent rises to the top of the clarifier and passes over a weir into the outlet pipe, from where it id discharged from the sewage treatment unit to a soakaway or watercourse.

 Most other sewage treatment units consist of three chambers, the first one being a Primary Settlement Tank where the solids form a septic sludge. They do not digest the solids and require regular emptying by tanker - every 12 weeks for the larger 20 person models!  Because the ClearFlo sewage treatment unit digests the solids as well as the organic matter in the liquid, the system has a much longer emptying interval than any three stage unit. Typically, the ClearFlo emptying interval is 3 years.  The absence of a primary settlement tank also results in NO primary settlement tank odour, which is a common problem with most 3 stage sewage treatment plants.

 The ClearFlo sewage treatment unit has the EN 12566-3 2005 Certification.  It is designed to produce an effluent of 20:30mg/litre BOD/SS on a 95 percentile basis and can discharge directly to a watercourse, unlike a septic tank.

The UK made sewage treatment unit

Tel 01757 288022